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BEGIN:VEVENT
SUMMARY:Interacting Bosons at Finite Angular Momentum Via Complex Langevin
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34902@indico.fnal.gov
DESCRIPTION:Speakers: Casey Berger (University of North Carolina at Chapel
Hill)\nQuantum field theories with a complex action suffer from a sign pr
oblem in stochastic non-perturbative treatments\, making many systems of g
reat interest - such as polarized or mass-imbalanced fermions and QCD at f
inite baryon density - extremely challenging to treat numerically. Another
such system is that of bosons at finite angular momentum\; experimentalis
ts have successfully achieved vortex formation in supercooled bosonic atom
s\, and have measured quantities of interest such as the moment of inertia
. However\, the rotation results in a complex action\, making the usual nu
merical treatments of the theory unusable. In this work\, we use complex s
tochastic quantization\, a method that has gained much attention in lattic
e QCD\, to calculate basic properties of interacting bosons at finite angu
lar momentum.\n\nhttps://indico.fnal.gov/event/15949/contributions/34902/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34902/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalized quasi parton distribution function of pion
DTSTART;VALUE=DATE-TIME:20180724T213000Z
DTEND;VALUE=DATE-TIME:20180724T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34901@indico.fnal.gov
DESCRIPTION:Speakers: Nikhil Karthik (BNL)\nWe present numerical results o
n the non-perturbative renormalization of the quasi-PDF operator as determ
ined using Wilson-Clover valence fermions on HISQ ensembles at two differe
nt lattice spacings\, with and without the explicit subtraction of the div
ergent Wilson line self-energy contribution. Then\, we present some prelim
inary results on the renormalized pion quasi-PDF as well as the pion PDF a
s obtained by matching using LaMET.\n\nhttps://indico.fnal.gov/event/15949
/contributions/34901/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34901/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Slope of Form Factors from Lattice QCD
DTSTART;VALUE=DATE-TIME:20180723T215000Z
DTEND;VALUE=DATE-TIME:20180723T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34900@indico.fnal.gov
DESCRIPTION:Speakers: Chia Cheng Chang (iTHEMS RIKEN)\nWe present an updat
e on the direct position-space method for calculating slopes of from facto
rs from lattice QCD.Momentum-space derivatives of matrix elements can be r
elated to their coordinate-space moments through the Fourier transform. We
derive these expressions as a function of momentum transfer $Q^2$ for asy
mptotic in/out states consisting of a single hadron. We calculate correcti
ons to the finite volume moments by studying the spatial dependence of the
lattice correlation functions. This method permits the computation of not
only the values of matrix elements at momenta accessible on the lattice\,
but also the momentum-space derivatives\, providing a priori information
about the $Q^2$ dependence of form factors. As a specific application we u
se the method\, at a single lattice spacing and with unphysically heavy qu
arks\, to directly obtain the slope of the isovector form factor at variou
s $Q^2$\, whence the isovector charge radius. The method has potential app
lication in the calculation of any hadronic matrix element with momentum t
ransfer\, including those relevant to hadronic weak decays.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34900/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34900/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed baryon spectrum in 2+1-flavor Lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34899@indico.fnal.gov
DESCRIPTION:Speakers: Utku Can (RIKEN)\nWe calculate the spectrum of charm
ed baryons on $32^3\\times64$\, $2+1$-flavor lattice QCD ensembles generat
ed by the PACS-CS Collaboration. Calculations are done with almost physica
l light quarks\, $m_\\pi$ ~ 156 MeV\, and physical strange and charm quark
s. A relativistic heavy-quark action is used for valance charm quarks to s
uppress the systematic errors. A two-fold variational analysis is employed
in order to access the excited states by varying the interpolating operat
ors and smearing parameters independently. In this talk\, we report on the
details and status of the current calculations and present some prelimina
ry results for positive and negative parity\, spin-$1/2$ and spin-$3/2$ st
ates.\n\nhttps://indico.fnal.gov/event/15949/contributions/34899/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34899/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pi_0 transition form factor in coordinate space
DTSTART;VALUE=DATE-TIME:20180724T211000Z
DTEND;VALUE=DATE-TIME:20180724T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34898@indico.fnal.gov
DESCRIPTION:Speakers: Cheng Tu (University of Connecticut)\nWe investigate
the lattice calculation of pi_0 transition form factor in coordinate spac
e\, which is relevant to hadronic light-by-light (HLbL) scattering in the
muon g-2. I will describe how we construct the coordinate space formulatio
n of the pion transition form factor. I will present preliminary results f
or the form factor computed on a physical pion mass\, 24^3\, 1.0 GeV\, 2+1
flavor Mobius-DWF ensemble generated by the RBC/UKQCD collaboration.\n\nh
ttps://indico.fnal.gov/event/15949/contributions/34898/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34898/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Testing a new gauge-fixed Fourier acceleration algorithm
DTSTART;VALUE=DATE-TIME:20180723T192000Z
DTEND;VALUE=DATE-TIME:20180723T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34897@indico.fnal.gov
DESCRIPTION:Speakers: Yidi Zhao (Columbia University)\nIn hybrid Monte Car
lo evolution\, by imposing a physical gauge condition\, simple Fourier acc
eleration can be used to generate conjugate momenta and potentially reduce
critical slowing down. This modified gauge evolution algorithm does no
t change the gauge-independent properties of the resulting gauge field con
figurations. We describe this algorithm and present results from our first
numerical experiments\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34897/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34897/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equation of state near the first order phase transition point of S
U(3) gauge theory using gradient flow
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34896@indico.fnal.gov
DESCRIPTION:Speakers: Mizuki Shirogane (Niigata University)\nWe study ener
gy gap (latent heat) between the hot and cold phases at the first order ph
ase transition point of the SU(3) gauge theory. Performing simulations on
lattices with various spatial volumes and lattice spacings\, we calculate
the energy gap by a method using the Yang-Mills gradient flow and compare
it with that by the conventional derivative method.\n\nhttps://indico.fnal
.gov/event/15949/contributions/34896/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34896/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large N Thermodynamics with Dynamical Fermions
DTSTART;VALUE=DATE-TIME:20180726T174000Z
DTEND;VALUE=DATE-TIME:20180726T180000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34895@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Hackett (University of Colorado Boulder)\nTo
date\, studies of the thermodynamics of QCD in the limit of large number o
f colors have been limited to the quenched approximation\, i.e.\, the beha
vior of pure SU(N) gauge theory at large N. We present a progress report o
n our investigation of the phase structure of large-N QCD in the presence
of (Wilson) fermions with finite mass. We explore the light quark mass reg
ime by simulating with two flavors of dynamical fermions in SU(3-5)\, and
investigate the heavy quark mass regime by reweighting around $\\kappa=0$
in SU(3-7).\n\nhttps://indico.fnal.gov/event/15949/contributions/34895/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34895/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inclusive decay structure function for $B\\to X_c\\ell\\nu$: a com
parison of a lattice calculation with the heavy quark expansion
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34894@indico.fnal.gov
DESCRIPTION:Speakers: Shoji Hashimoto (KEK)\nA lattice calculation of incl
usive decay structure functions for\n$B¥to X_c¥ell¥nu$ is compared with
the corresponding estimates\nbased on the heavy quark expansion. Both met
hods are applicable\nin the region away from the resonances/cuts due to fi
nal charmed\nstates\, and one can test the theoretical methods employed on
both\nsides.\n\nhttps://indico.fnal.gov/event/15949/contributions/34894/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34894/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark orbital angular momentum in the proton evaluated using a dir
ect derivative method
DTSTART;VALUE=DATE-TIME:20180725T202000Z
DTEND;VALUE=DATE-TIME:20180725T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34893@indico.fnal.gov
DESCRIPTION:Speakers: Michael Engelhardt (NMSU)\nQuark orbital angular mom
entum (OAM) in the proton can be calculated\ndirectly given a Wigner funct
ion encoding the simultaneous\ndistribution of quark transverse positions
and momenta. This\ndistribution can be accessed via proton matrix elements
of a quark\nbilocal operator (the separation in which is Fourier conjugat
e to\nthe quark momentum) featuring a momentum transfer (which is Fourier\
nconjugate to the quark position). To generate the weighting by quark\ntra
nsverse position needed to calculate OAM\, a derivative with respect\nto m
omentum transfer is consequently required. This derivative is\nevaluated u
sing a direct derivative method\, i.e.\, a method in which\nthe momentum d
erivative of a correlator is directly sampled in the\nlattice calculation\
, as opposed to extracting it a posteriori from\nthe numerical correlator
data. The method removes the bias stemming \nfrom estimating the derivativ
e a posteriori that was seen to afflict a\nprevious exploratory calculatio
n. Data for Ji OAM generated on a clover\nensemble at 317 MeV pion mass ar
e seen to agree with the result\nobtained via the traditional Ji sum rule
method. By varying the\ngauge connection in the quark bilocal operator\, a
lso Jaffe-Manohar\nOAM is extracted\, and seen to be enhanced significantl
y compared to \nJi OAM.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34893/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34893/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Improving the Feynman-Hellmann Method
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34892@indico.fnal.gov
DESCRIPTION:Speakers: Arjun Gambhir (Lawrence Livermore National Laborator
y)\nThe Feynman-Hellmann method\, as implemented by Bouchard et al. [1612.
06963]\, has recently been used successfully to determine the nucleon axia
l charge. A limitation of the method was the restriction to a single oper
ator and a single momentum during the computation of each "Feynman-Hellman
n" propagator. Here we discuss enhancements to the method that relax this
constraint and we demonstrate the successful implementation of the improv
ed version with a reproduction of the axial charge on a test ensemble.\n\n
https://indico.fnal.gov/event/15949/contributions/34892/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34892/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studies of I=0 and 2 pi-pi scattering with physical pion mass
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34891@indico.fnal.gov
DESCRIPTION:Speakers: Tianle Wang (Columbia University)\nWe report a direc
t lattice calculation of both the I=0 and 2 pi-pi scattering phase shifts
using G-parity boundary conditions on an ensemble of $32^3\\times64$ gauge
configurations at physical quark mass. This extends an earlier calculati
on of the RBC/UKQCD Collaboration by including additional operators and us
ing non-zero center-of-mass momenta. We apply the generalized eigenvalue
treatment to this set of operators in order to understand and reduce excit
ed state contamination and to study pi-pi scattering at energies in the en
ergy region around the kaon mass. These results are compared with results
from Roy's equation.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34891/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34891/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Results for the mass difference between the long- and short-lived
K mesons for physical quark masses
DTSTART;VALUE=DATE-TIME:20180727T204000Z
DTEND;VALUE=DATE-TIME:20180727T210000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34890@indico.fnal.gov
DESCRIPTION:Speakers: Bigeng Wang (Columbia University)\nThe two neutral k
aon states in nature\, the KL (long-lived) and KS (short-lived) mesons\, a
re the two time-evolution eigenstates of the $K^0$ -- $\\overline{K}^0$ mi
xing system. The prediction of their mass difference $\\Delta M_K$ based
on the Standard Model is an important goal of lattice QCD. In this talk\,
I will present preliminary results from a calculation of $\\Delta M_K$ per
formed on an ensemble of $64^3\\times128$ gauge configurations with invers
e lattice spacing of 2.36 GeV and physical quark masses. These new result
s come from twice the Monte Carlo statistics used for the result presented
in last year’s conference. Further discussion of the methods employed a
nd the resulting systematic errors will be given.\n\nhttps://indico.fnal.g
ov/event/15949/contributions/34890/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34890/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Systematics in nucleon matrix element calculations
DTSTART;VALUE=DATE-TIME:20180727T143000Z
DTEND;VALUE=DATE-TIME:20180727T150000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34889@indico.fnal.gov
DESCRIPTION:Speakers: Jeremy Green (DESY\, Zeuthen)\nThe current status of
calculations of simple nucleon structure observables\, such as the axial
charge\, will be reviewed. Recent calculations have produced steadily bett
er control over the standard sources of systematic uncertainty\, and there
are now multiple groups doing calculations with near-physical quark masse
s. A major challenge is the combination of an exponentially decaying signa
l-to-noise ratio and the need for large source-sink separations to elimina
te excited-state contributions. There is a growing number of approaches fo
r dealing with this problem\, and an overview of them will be given.\n\nht
tps://indico.fnal.gov/event/15949/contributions/34889/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34889/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The large-mass regime of confining but nearly conformal gauge theo
ries
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34888@indico.fnal.gov
DESCRIPTION:Speakers: Maarten Golterman (San Francisco State University)\n
We apply a recently developed dilaton-pion effective field theory for\nasy
mptotically free gauge theories near the conformal window to the SU(3)\nga
uge theory with $N_f=8$ fermions in the fundamental representation.\nNumer
ical data for this theory suggests the existence of a large-mass\nregime\,
where the fermion mass is not small but nevertheless the effective\ntheor
y is applicable because of the parametric proximity of the conformal\nwind
ow. In this regime\, we find that the mass dependence of hadronic\nquanti
ties is similar to that of a a mass-deformed conformal theory\, so\nthat d
istinguishing infrared conformality from confinement requires the\nstudy o
f subleading effects.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34888/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34888/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale Setting on the MDWF in Gradient Flow HISQ Action With the Om
ega Baryon
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34887@indico.fnal.gov
DESCRIPTION:Speakers: Logan Carpenter (Student at Brigham Young University
Idaho)\nWe perform scale setting for the MDWF on gradient flowed HISQ act
ion. 18 different ensembles are used to perform an extrapolation of the o
mega baryon to the physical point. Various schemes of defining dimensionl
ess variables to parameterize the light and strange quark mass are used to
estimate systematic uncertainties in the scale setting.\n\nhttps://indico
.fnal.gov/event/15949/contributions/34887/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34887/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Updates of Nucleon Form Factors from Clover-on-HISQ Formulation
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34886@indico.fnal.gov
DESCRIPTION:Speakers: Yong-Chull Jang (Brookhaven National Laboratory)\nWe
update the nucleon axial\, electric\, and magnetic form factors obtained
from Clover-on-HISQ lattice formulation. Previous results from the $2+1+1$
-flavor HISQ ensembles are extended by analyzing more ensembles to cover $
a \\approx 0.15\, 0.12\, 0.09\, 0.06\\\,\\mathrm{fm}$\, $M_\\pi \\approx 3
10\, 220\, 130\\\,\\mathrm{MeV}$\, and $ 3.3 \n\nhttps://indico.fnal.gov/e
vent/15949/contributions/34886/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34886/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on upcoming ARM architectures
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34885@indico.fnal.gov
DESCRIPTION:Speakers: Nils Meyer (University of Regensburg)\nWe present ou
r experiences porting Lattice QCD code to upcoming ARM processor architect
ures\, \nwhich will be used for future supercomputers such as QPACE 4 (Uni
versity of Regensburg\, Germany) and Post-K (RIKEN\, Japan). These proces
sors will support the ARM Scalable Vector Extension (SVE). SVE allows to d
esign processor cores providing significantly higher performance compared
to the \ncores available today.\n\nSVE is a novel extension of the ARM ins
truction set architecture. It supports a vector-length agnostic (VLA) prog
ramming model that\, in contrast to the traditional fixed-size \nSIMD inst
ruction approach\, can adapt to different vector length at run-time. The n
ecessary \nhardware support for VLA helps for parallelizing applications a
t vector instruction level.\n\nIn this poster we present results from enab
ling LQCD applications SVE. More specifically\, we \nported the "Grid" lib
rary\, which is a LQCD library optimized for processor architectures that
feature wide SIMD instructions. Code correctness has been verified using e
mulators.\n\nWe collaborate with ARM in order to evaluate and develop key
aspects of an efficient SVE \ntoolchain\, which includes SVE compiler and
code profiler technology. First processors \nsupporting SVE are expected t
o become available in 2020.\n\nhttps://indico.fnal.gov/event/15949/contrib
utions/34885/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34885/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron-Hadron Interactions from N_f = 2 + 1 + 1 Lattice QCD: $\\pi
-K$ scattering length
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34884@indico.fnal.gov
DESCRIPTION:Speakers: Ferenc Pittler (HISKP BONN)\nIn this talk we present
our recent results of the elastic scattering length in the $I_3=\\frac{3}
{2}$ channel $\\pi-K$ scattering. We show a new method to remove thermal e
ffects in the interaction energy of the $\\pi-K$ system\, and present a ca
reful continuum and chiral extrapolation of the scattering length.\n\nhttp
s://indico.fnal.gov/event/15949/contributions/34884/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34884/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress in Two-Nucleon Spectroscopy
DTSTART;VALUE=DATE-TIME:20180723T160000Z
DTEND;VALUE=DATE-TIME:20180723T163000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34883@indico.fnal.gov
DESCRIPTION:Speakers: Evan Berkowitz (Forschungszentrum Jülich)\nAnchorin
g the nuclear interaction in QCD is a long-outstanding problem in nuclear
physics. While the lattice community has made enormous progress in mesoni
c physics and single nucleon physics\, continuum-limit physical-point mult
i-nucleon physics has remained out of reach. I will review CalLat's strat
egy for multi-nucleon spectroscopy and our latest results.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34883/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34883/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization and topology in high temperature QCD
DTSTART;VALUE=DATE-TIME:20180724T215000Z
DTEND;VALUE=DATE-TIME:20180724T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34882@indico.fnal.gov
DESCRIPTION:Speakers: Tamas G. Kovacs (Institute for Nuclear Physics)\nAt
high temperature part of the spectrum of the quark Dirac operator is known
\nto consist of localized states. This comes about because around the cros
s-over\ntemperature to the quark-gluon plasma\, localized states start to
appear at the\nlow end of the spectrum and as the system is further heated
\, states higher up\nin the spectrum also get localized. Since localizatio
n and the crossover to\nthe chirally restored phase happen around the same
temperature\, the question\nof how the two phenomena are connected natura
lly arises. Here we speculate on\nthe nature of possible gauge configurati
ons that could support localized quark\neigenmodes. In particular\, by ana
lyzing eigenmodes of the staggerd and overlap\nDirac operator we check whe
ther a dilute gas of calorons or other forms of\ntopological charge can pl
ay a major role in localization.\n\nhttps://indico.fnal.gov/event/15949/co
ntributions/34882/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34882/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating the Phase Structure of Large N Unitary Matrix Models
using Complex Langevin Method
DTSTART;VALUE=DATE-TIME:20180723T202000Z
DTEND;VALUE=DATE-TIME:20180723T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34881@indico.fnal.gov
DESCRIPTION:Speakers: Anosh Joseph (ICTS-TIFR)\nUsing complex Langevin met
hod we examine the phase structure of complex unitary matrix models and co
mpare the numerical results with analytic results found at large number of
colors. The actions we consider are manifestly complex\, and thus the dom
inant contributions to the path integral comes from the space of complexif
ied gauge field configurations. For this reason\, the eigenvalues of unita
ry matrices lie off the unit circle and explore out in the complex plane.
One example of a complex unitary matrix model\, with Polyakov line as the
unitary matrix\, is an effective description of a QCD at finite density an
d temperature\, with finite number of colors and quark flavors\, defined o
n a compact manifold. A distinct feature of this model\, the occurrence of
a series of Gross-Witten-Wadia transitions\, as a function of the quark c
hemical potential\, is reproduced using complex Langevin dynamics. We simu
late several other observables including Polyakov lines and quark number d
ensity\, for large number of colors and quark flavors\, and found excellen
t match with the analytic results.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34881/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34881/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_s\\to D_s l\\nu$ form factors using heavy HISQ quarks
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34880@indico.fnal.gov
DESCRIPTION:Speakers: Euan McLean (University of Glasgow)\nWe present prog
ress on an ongoing calculation of the $B_s\\to D_s l\\nu$ form factors\nca
lculated on the 2+1+1 MILC ensembles and using the Highly Improved Stagger
ed Quark action for all valence quarks. We perform the calculation at unph
ysically light $b$ quark masses and\nextrapolate to the physical point.\n\
nhttps://indico.fnal.gov/event/15949/contributions/34880/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34880/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of the 1+1 dimensional Thirring model using the meth
od of matrix product states
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34879@indico.fnal.gov
DESCRIPTION:Speakers: C.-J. David Lin (National Chiao-Tung University)\nWe
present results from our study of the 1+1 dimensional Thirring model empl
oying the techniques of Matrix Product States. As the first step of a re
search programme for examining this model with the Hamiltonian formalism o
n the lattice\, we determine the phase structure of the theory. In partic
ular\, we confirm the existence of the critical phase in the Thirring mode
l in two dimensions. This is achieved by computing the mass gap\, the chi
ral condenstate\, the entanglement entropy\, as well as the fermion correl
ator.\n\nhttps://indico.fnal.gov/event/15949/contributions/34879/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34879/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The properties of D1-branes from lattice super Yang--Mills theory
using gauge/gravity duality
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34878@indico.fnal.gov
DESCRIPTION:Speakers: Raghav Govind Jha (Syracuse University)\nWe consider
1+1-dimensional maximally supersymmetric Yang–Mills theory (SYM) at lar
ge N and strong ’t Hooft coupling which is dual to D1 branes. One can ha
ve different tori based on the expansion of the gauge links in the moduli
space\, which is required to target the correct continuum theory. In our p
revious work\, we explored a special skewed torus corresponding to A2* geo
metry. Here\, we will restrict ourselves to a rectangular torus and calcul
ate the free energy\, equation of state using some known techniques from l
attice QCD. This will enable us to evaluate the speed of sound for this st
rongly coupled plasma. Since there is no shear viscosity in two dimensions
\, we comment on the expectations for the bulk viscosity from the calculat
ions on the dual gravity side\, which unlike the conformal N=4 SYM case\,
does not vanish and is proportional to the trace anomaly.\n\nhttps://indic
o.fnal.gov/event/15949/contributions/34878/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34878/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum field theory on a causal set
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34877@indico.fnal.gov
DESCRIPTION:Speakers: Roman Sverdlov (University of New Mexico)\nCausal se
t theory\, originally introduced by Rafael Sorkin\, is a model of spacetim
e as a partially ordered set: an element of a set corresponds to a point i
n spacetime\, while partial ordering corresponds to lightcone causal relat
ion. There is no coordinate system: all of the geometry is to be deduced f
rom partial ordering alone. Consequently\, one has to rewrite Lagrangians
in quantum field theory in such a way that would avoid derivative signs or
anything else with Lorentz index. In my talk I will discuss some of the w
ays of doing so (both the ones introduced by myself and by others).\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34877/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34877/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ab initio calculations of nuclear thermodynamics
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34876@indico.fnal.gov
DESCRIPTION:Speakers: Bingnan Lu (Michigan State University)\nWe present t
he first ab initio calculations of nuclei and nuclear matter at finite tem
perature. Using lattice Monte Carlo simulations and chiral effective field
theory\, we probe the thermal properties of nuclear systems from first pr
inciples. We find that the pinhole algorithm\, initially developed for ext
racting nucleon densities\, is well suited for computing the canonical par
tition function. We employ a chiral nuclear force fitted to nucleon-nucleo
n scattering data on the lattice and calculate a variety of thermodynamic
quantities for light nuclei\, dilute neutron matter\, and dilute nuclear m
atter\, such as the free energy\, entropy\, and specific heat. The pinhole
algorithm is found to largely alleviate the sign problem\, which prevente
d previous attempts in this direction.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34876/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34876/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deforming Path Integration Contours: Application to Finite Density
Thirring Model
DTSTART;VALUE=DATE-TIME:20180723T215000Z
DTEND;VALUE=DATE-TIME:20180723T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34875@indico.fnal.gov
DESCRIPTION:Speakers: Neill Warrington (University of Maryland\, College P
ark)\nSystems of fermions at finite density have complex Boltzmann weights
which cause the integrand of the path integral to be highly oscillatory.
As a result of these oscillations\, standard integration methods require
exponential precision in the spacetime volume to compute observables. Howe
ver\, deforming the path integration contour to a manifold which approxima
tes a set of Lefschetz Thimbles tames phase oscillations while leaving phy
sical observables invariant. I will describe this deformation procedure\,
which is achieved with the holomorphic gradient flow\, then apply it to th
e Finite Density Thirring Model\, which is a system with a sufficiently ba
d sign problem that standard methods fail.\n\nhttps://indico.fnal.gov/even
t/15949/contributions/34875/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34875/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative calculation of $Z_q$ at the one-loop level using
HYP-smeared staggered quarks
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34874@indico.fnal.gov
DESCRIPTION:Speakers: Benjamin Jaedon Choi (Seoul National University)\nWe
present matching factors for $Z_q$ calculated perturbatively at th
e one-loop level with improved staggered quarks. We calculate $Z_q$
with HYP-smeared staggered quarks and Symanzik-improved gluons in
RI- and RI$'$-MOM scheme. Using the conversion factor\, we also
present $Z_q$ in MSbar scheme. As a byproduct\, we present the quark
mass renormalization factor $Z_m$ in MSbar scheme. We compare the re
sult from this work with those of nonperturbative renormalization
method.\n\nhttps://indico.fnal.gov/event/15949/contributions/34874/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34874/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flowing Gauge Theories: Finite-Density QED$_{1+1}$
DTSTART;VALUE=DATE-TIME:20180723T221000Z
DTEND;VALUE=DATE-TIME:20180723T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34873@indico.fnal.gov
DESCRIPTION:Speakers: Henry Lamm (University of Maryland)\nFinite-density
calculations in lattice field theory are typically plagued by sign problem
s. A promising way to ameliorate this issue is the so-called "holomorphic
flow" equations that deform the manifold of integration for the path inte
gral to manifolds in the complex space where the sign fluctuations are les
s dramatic. In this talk\, We will discuss some novel features of applyin
g the flow equations to gauge theories and present results for finite-dens
ity QED$_{1+1}$.\n\nhttps://indico.fnal.gov/event/15949/contributions/3487
3/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34873/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryonic states in supersymmetric Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34872@indico.fnal.gov
DESCRIPTION:Speakers: Sajid Ali (Institute for Theoretical Physics\, Unive
rsity of Münster\, Germany.)\nIn $\\mathcal{N} = 1$ supersymmetric Yang-M
ills theory the superpartner of the gluon is the gluino\, which is a spin
1/2 Majorana particle in the adjoint representation of the gauge group. Co
mbining three gluinos\, it is possible to form colour neutral bound states
\, analogous to baryons in QCD. The correlation functions of the correspon
ding baryonic operators contain a contribution represented by a "sunset di
agram''\, and in addition\, unlike in QCD\, another contribution represent
ed by a "spectacle diagram''. We present first results from an implementat
ion and calculation of these objects\, obtained from numerical simulations
of supersymmetric Yang-Mills theory.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34872/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34872/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiative corrections to decay amplitudes in lattice QCD
DTSTART;VALUE=DATE-TIME:20180725T194000Z
DTEND;VALUE=DATE-TIME:20180725T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34871@indico.fnal.gov
DESCRIPTION:Speakers: Chris Sachrajda (University of Southampton)\nThe pre
cision of lattice QCD computations of many quantities have reached such a
precision that isospin breaking corrections\, including electromagnetism\,
must be included if further progress is to be made in extracting fundamen
tal information\, such as the values of Cabibbo-Kobayashi-Maskawa matrix e
lements\, from experimental measurements. I discuss the framework for incl
uding radiative corrections in leptonic and semileptonic decays of hadrons
\, including the treatment of infrared divergences. I start by briefly rev
iewing isospin breaking in leptonic decays and presenting the first numeri
cal results for the ratio $\\Gamma(K_{\\mu2})/\\Gamma(\\pi_{\\mu2})$ in wh
ich these corrections have been included. I will also discuss the addition
al theoretical issues which arise when including electromagnetic correctio
ns to semileptonic decays\, such as $K_{\\ell3}$ decays.\n\nhttps://indico
.fnal.gov/event/15949/contributions/34871/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34871/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moments of pion distribution amplitude using OPE on the lattice
DTSTART;VALUE=DATE-TIME:20180724T200000Z
DTEND;VALUE=DATE-TIME:20180724T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34870@indico.fnal.gov
DESCRIPTION:Speakers: Santanu Mondal (National Chiao-Tung University)\nWe
will show our calculation of the moments of pion distribution amplitude us
ing a method proposed in Phys.Rev.D73:014501(2006) [hep-lat/0507007]. Sinc
e the method requires a fine lattice\, it becomes practical only recently.
The procedure is based on calculating the suitable\, bilocal current-curr
ent products sandwiched between a pion state and vacuum on the lattice. Th
en the lattice calculations of these quantities can be matched with the fo
rmulae obtained by using Euclidean operator product expansion (OPE)\, to c
alculate moments.\nUse of a fictitious\, valance heavy quark facilitates t
he calculation in a number of ways. Our exploratory numerical result shows
opportunities to overcome difficulties in operator mixing and renormalisa
tion that the traditional method suffers from.\n\nhttps://indico.fnal.gov/
event/15949/contributions/34870/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34870/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the phase diagram of finite density QCD at low temperatu
re by the complex Langevin method
DTSTART;VALUE=DATE-TIME:20180723T200000Z
DTEND;VALUE=DATE-TIME:20180723T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34869@indico.fnal.gov
DESCRIPTION:Speakers: Yuta Ito (KEK)\nMonte Carlo studies of QCD at finite
density suffer from \nthe notorious sign problem\, which becomes easily u
ncontrollable \nas the chemical potential increases for a moderate lattice
size.\nIn this work\, we attempt to approach the high density\nlow temper
ature region by the complex Langevin method (CLM). \nSimulations are perfo
rmed on an 8^3 x 16 lattice using four-flavor \nstaggered fermions with re
asonably small quark mass.\nUnlike previous work with a 4^3 x 8 lattice\,\
nthe criterion for correct convergence is satisfied\nin the nuclear matter
phase without using the deformation technique. \nIn this phase the baryon
number density has a plateau with respect\nto the chemical potential\, an
d it starts to grow rapidly at some point.\n\nhttps://indico.fnal.gov/even
t/15949/contributions/34869/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34869/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy-quark physics with a tmQCD valence action
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34868@indico.fnal.gov
DESCRIPTION:Speakers: Andrea Bussone (IFT\, UAM-CSIC)\nWe introduce a mixe
d-action approach based on CLS ensembles\, where a valence Nf=2+1+1 fully-
twisted tmQCD action is combined with the Nf=2+1 non-perturbatively O(a)-i
mproved Wilson sea sector. Some field-theoretical properties of this setup
(unitarity\, O(a) improvement\, relevance of open boundary conditions) ar
e discussed. Particular emphasis is given to the application of this setup
to heavy-quark flavour physics\, focusing on the developments needed to a
ddress the leading systematic effects in the charm sector.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34868/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34868/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD phase diagram for finite imaginary chemical potential with HIS
Q fermions
DTSTART;VALUE=DATE-TIME:20180725T215000Z
DTEND;VALUE=DATE-TIME:20180725T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34867@indico.fnal.gov
DESCRIPTION:Speakers: Jishnu Goswami (Bielefeld University)\nThe QCD phase
diagram at finite temperature and density has a very rich physical struct
ure which can be explored with first principle lattice QCD calculations. W
e study the QCD phase diagram of (2+1)-flavor QCD with imaginary chemical
potential using HISQ action which has reduced taste breaking effects compa
red to the unimproved staggered quark action and hence may allow us to get
close to the continuum limit earlier.\n We will present results on th
e fate of the $2^{nd}$ order endpoint of the line of $1^{st}$ order phase
transitions in the Roberge-Weiss (RW) plane. We perform calculations on la
ttices with temporal extend $N_t=4$ and several spatial lattice sizes. The
strange quark mass is tuned to its physical value and the degenerate ligh
t quark mass values are reduced towards the chiral limit to find the crit
ical Goldstone pion mass at which this $2^{nd}$ order endpoint becomes a $
1^{st}$ order triple point. At present we are exploring regions of pion ma
sses $m_{\\pi}\\geq 90$ MeV.\n\nhttps://indico.fnal.gov/event/15949/contri
butions/34867/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34867/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a new lattice QCD code: performances and first application
s
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34866@indico.fnal.gov
DESCRIPTION:Speakers: Giovanni Pederiva (Michigan State University)\nWe pr
esent a recently started project of a new implementation of a C++ code-bas
e to perform lattice QCD calculations. \n As a first step\, we have imp
lemented a Multi-Hit Metropolis algorithm for generating configurations in
Yang-Mills theory and a third order Runge-Kutta scheme for \n applying
the Gradient Flow to the gauge fields.\n We performed tests of the aut
ocorrelation time of the energy density and of the topological charge to f
ind suitable parameters for the Metropolis algorithm. \n The scaling pr
operties of the code have also been studied and results show that the stro
ng scaling efficiency coefficient is $\\eta_{\\mathrm{S}} \\approx 80\\%$
for \n an increase in processor number of $2^4$. \n Collectives are
handled using MPI and plans of using features from the $3.0$ standard are
presented. The program so far has been tested on three different clusters
\n with up to $2^{10}$ cores.\\\\\n To demonstrate the capabilities
of the new code-base we performed a calculation of $\\Lambda_{\\mathrm{\\o
verline{MS}}}$ for pure-gauge theory using the gradient flow to define an
energy scale as $q=1/\\sqrt{8t}$ finding results\, through an unbiased mul
ti-fitting procedure\, consistent with the existing literature.\n\nhttps:/
/indico.fnal.gov/event/15949/contributions/34866/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34866/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of energy-momentum tensor correlation function in Nf=2+1 ful
l QCD for QGP viscosities
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34865@indico.fnal.gov
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\nWe study c
orrelation functions of the energy-momentum (EM) tensor in Nf=2+1 full QCD
for the sake of QGP viscosities.\nThe viscosity is given by three steps o
n lattice: \n(1) calculate two point correlation functions of the energy-m
omentum tensor\,\n(2) derive the spectral function from the correlation fu
nction\,\n(3) applying the Kubo's formula the viscosity is related to the
spectral function.\nHowever the first two steps have severe difficulties.\
nBy applying the gradient flow we solve the difficulty in the first step t
hat the EM tensor cannot be defined as a conserved current on lattice and
give a non-perturbatively renormalized EM tensor.\nWe calculate the correl
ation functions of the EM tensor and try to extract the shear viscosity th
rough the spectral function.\n\nhttps://indico.fnal.gov/event/15949/contri
butions/34865/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34865/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological Susceptibility in $N_f=2$ QCD at Finite Temperature --
Volume Study
DTSTART;VALUE=DATE-TIME:20180724T194000Z
DTEND;VALUE=DATE-TIME:20180724T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34864@indico.fnal.gov
DESCRIPTION:Speakers: Yasumichi Aoki (KEK)\nWe study the topological charg
e in $N_f=2$ QCD at finite temperature\nusing Mobius domain-wall fermions
with reweighting to ovelap fermions.\nThe susceptibility $\\chi_t$ of the
topological charge is studied \nin the high temperature phase with varying
quark mass.\nLast year\, we reported on a strong suppression of the susce
ptibility\,\nobserved below a certain value of the quark mass on a fixed s
patial volume.\nWe extend this study by changing the volume to both smalle
r and larger direction.\nThe relation with the restoration of $U_A(1)$ is
discussed.\n\nhttps://indico.fnal.gov/event/15949/contributions/34864/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34864/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative renormalization of operators in near-conformal sy
stems using gradient flow
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34863@indico.fnal.gov
DESCRIPTION:Speakers: Anna Hasenfratz (university of colorado boulder)\nWe
discuss a continuous real space renormalization group transformation base
d on gradient flow\, allowing for a numerical study of renormalization wit
hout the need for costly ensemble matching. Applying the technique in a p
ilot study of SU$(3)$ gauge theory with $N_f = 12$ fermions in the fundame
ntal representation\, we find the mass anomalous dimension to be $\\gamma_
m = 0.23(6)$\, consistent with other perturbative and lattice estimates.
We also present the first lattice calculation of the nucleon anomalous dim
ension in this theory\, finding $\\gamma_N = 0.05(5)$.\n\nhttps://indico.f
nal.gov/event/15949/contributions/34863/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34863/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of the Nf=12 step scaling function using Möbius dom
ain wall fermions
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34862@indico.fnal.gov
DESCRIPTION:Speakers: Anna Hasenfratz (university of colorado boulder)\nWe
calculate the step scaling function for twelve fundamental flavors\nnonpe
rturbatively by determining the gradient flow coupling on gauge field conf
igurations generated with dynamical stout smeared Möbius domain wall ferm
ions and Symanzik gauge action. Using Zeuthen\, Symanzik\, and Wilson flow
we measure the energy density with three different operators. Our updated
analysis is now based on up to five volume pairs ranging from $L^4 = 8^4$
up to $32^4$. Our new results confirm the previously observed discrepancy
with results obtained from staggered fermion simulations.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34862/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34862/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice calculation of neutron electric dipole moment with overlap
fermions
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34861@indico.fnal.gov
DESCRIPTION:Speakers: Jian Liang (University of Kentucky)\nWe report our c
alculation of the neutron electric dipole moment of the contribution from
the $\\theta$ term with overlap fermions on the 2+1-flavor RBC/UKQCD domai
n wall lattices 24I and 32ID. For the 24I lattice the size is 2.65 fm and
the pion mass is 337 MeV and for the 32ID lattice the size is 4.58 fm and
the pion mass is 171 MeV. In order to solve the large-volume problem\, the
cluster-decomposition error reduction (CDER) technique is utilized to imp
rove the signal-to-noise ratio especially for the lattice with larger volu
me.\n\nhttps://indico.fnal.gov/event/15949/contributions/34861/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34861/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non perturbative physics from NSPT: renormalons\, the gluon conden
sate and all that
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34860@indico.fnal.gov
DESCRIPTION:Speakers: Francesco Di Renzo (University of Parma and INFN)\nN
umerical Stochastic Perturbation Theory (NSPT) enables very high order com
putations in Lattice Gauge Theories. We report on the determination of the
gluon condensate from lattice QCD measurements of the basic plaquette. Th
is is a long standing problem\, which was eventually solved a few years ag
o in pure gauge. In this context NSPT is crucial: it is actually the only
tool enabling the subtraction of the power divergent contribution associat
ed to the identity operator in the OPE for the plaquette. This subtraction
\n is actually a delicate issue\, since the perturbative expansion of the
plaquette is on general ground expected to be an asymptotic one\, due to r
enormalons. This in turns results in ambiguities and the separation of sca
les in the OPE does not correspond to a separation of perturbative and non
-perturbative contributions. All in all\, one needs to absorb the\nambigui
ties attached to the perturbative series into the definition of the conden
sate itself\,\ni.e. one needs a prescription. A possible one amounts to su
mming the perturbative series up to its minimal term\, which means computi
ng up to orders which only NSPT can aim at.\nOur computation is the first
one in QCD\, with massless staggered fermions. In order to remove the zero
-mode of the gauge field\, twisted boundary conditions are adopted for the
latter\, consistently coupled to fermions in the fundamental representati
on supplemented with smell degrees of freedom.\n\nhttps://indico.fnal.gov/
event/15949/contributions/34860/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34860/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Is SU(3) gauge theory with 13 massless flavors conformal?
DTSTART;VALUE=DATE-TIME:20180725T194000Z
DTEND;VALUE=DATE-TIME:20180725T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34859@indico.fnal.gov
DESCRIPTION:Speakers: Kieran Holland (University of the Pacific)\nThere is
a long running controversy over which SU(3) gauge theories with Nf massle
ss fermion flavors in the fundamental representation are conformal\, with
particular focus on Nf = 12 and 10. In our studies of both theories\, we h
ave found no evidence of conformality as shown by an infrared fixed point
of the beta function\, in direct contradiction to claims by other groups c
overing the same range of the gauge coupling and using the same beta funct
ion scheme. To complement this work\, we present the current status of our
beta function measurement for Nf = 13\, using the gradient flow\, paying
particular attention to the continuum limit.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34859/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34859/
END:VEVENT
BEGIN:VEVENT
SUMMARY:2018 update of $\\varepsilon_K$ with lattice QCD inputs
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34858@indico.fnal.gov
DESCRIPTION:Speakers: Weonjong Lee (Seoul National University)\nWe report
recent progress in determining $\\varepsilon_K$\, the indirect\nCP violati
on parameter in the neutral kaon system\, calculated using\nlattice QCD in
puts including $B_K$\, $\\xi_0$\, $\\xi_2$\, $V_{us}$\,\n$V_{cb}$\, and $m
_c(m_c)$. In this report\, various other input\nparameters such as $m_t(m_
t)$ have also been updated recently.\n\nhttps://indico.fnal.gov/event/1594
9/contributions/34858/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34858/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress and prospects of lattice supersymmetry
DTSTART;VALUE=DATE-TIME:20180724T140000Z
DTEND;VALUE=DATE-TIME:20180724T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34857@indico.fnal.gov
DESCRIPTION:Speakers: David Schaich (University of Bern)\nSupersymmetry pl
ays prominent roles in modern theoretical physics\, as a tool to improve o
ur understanding of quantum field theory\, as an ingredient in many new ph
ysics models\, and as a means to study quantum gravity via holographic dua
lity. Lattice investigations of supersymmetric field theories have a long
history but often struggle due to the interplay of supersymmetry with the
discretization of spacetime. I will review several areas in which these
difficulties have been overcome\, allowing for significant progress in rec
ent years\, and discuss important challenges that still remain.\n\nhttps:/
/indico.fnal.gov/event/15949/contributions/34857/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34857/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prospects for Lattice QFTs on Curved Riemann Manifolds
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34856@indico.fnal.gov
DESCRIPTION:Speakers: Richard C. Brower (Boston University)\nConformal or
near conformal QFTs would benefit from\na rigorous non-perturbative la
ttice formulation beyond the flat\nEuclidean space\, $\\mathbb R^d.\\\
;$ Although all UV complete QFT are \nknown to be also perturbatively
renormalizable on any smooth Riemann\nmanifold\, non-perturbative reali
zation on simplicial lattices (triangulations) encounter difficulties as
the UV cut-off isremoved. We review the Quantum Finite Element (QFE) meth
od that combines classical Finite Element and Regge Geometry with new quan
tum\ncounter terms designed to address this. The construction for maximal
ly symmetric spaces $(\\mathbb S^d\, \\mathbb R \\times \\mathbb S^{d-1}
$ and $\\mathbb Ad{\\mathbb S}^{d+1})$ is outlined with numerical tests o
n $\\mathbb S^2$ and a description of theoretical\nand algorithmic chall
enges for $d = 3\, 4$ QFTs.\n\nhttps://indico.fnal.gov/event/15949/contri
butions/34856/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34856/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Form factor calculation using DWQCD
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34855@indico.fnal.gov
DESCRIPTION:Speakers: Taku Izubuchi (Brookhaven National Laboratory)\nNucl
eon form factors are not only interesting for understand the structure of\
nthe fundamental building blocks of nature\, but they are also important i
nput for various experiments such as neutrino facility.\nThey are also rel
ated to the electric and axial radius of proton or nucleon\, experimental
results of which present some puzzles. We report form factor results on 2+
1 DWQCD at physical point. We may also discuss about exploratory study on
form factors using distillation.\n\nhttps://indico.fnal.gov/event/15949/c
ontributions/34855/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34855/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of dynamical (u\,d\,s\,c) domain-wall/overlap quarks at
the physical point
DTSTART;VALUE=DATE-TIME:20180725T221000Z
DTEND;VALUE=DATE-TIME:20180725T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34854@indico.fnal.gov
DESCRIPTION:Speakers: Ting-Wai Chiu (National Taiwan University)\nWe perfo
rm hybrid Monte-Carlo simulation of $N_f=2+1+1$ lattice QCD\nwith domain-w
all/overlap quarks at the physical point. The simulation is carried out on
a $ 64^4 $ lattice with lattice spacing $a \\sim 0.06$ fm\, using the Nvi
dia DGX-1 (8 Volta GPUs interconnected by the NVLink). To attain the maxim
al chiral symmetry for a finite extent ($N_s =16$) in the fifth dimension\
, we use the optimal domain-wall fermion for the quark action\, together w
ith the exact one-flavor action for domain-wall fermion. We outline the sa
lient features of our simulation (e.g.\, without topology freezing\, small
residual masses\, etc.)\, and present our preliminary results of the mass
spectra of mesons and baryons.\n\nhttps://indico.fnal.gov/event/15949/con
tributions/34854/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34854/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasi-PDFs from Twisted mass fermions at the physical point
DTSTART;VALUE=DATE-TIME:20180723T192000Z
DTEND;VALUE=DATE-TIME:20180723T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34853@indico.fnal.gov
DESCRIPTION:Speakers: Aurora Scapellato (University of Cyprus - University
Of Wuppertal)\nParton distribution functions (PDFs) provide a detailed de
scription of hadron structure and are crucial inputs in analyses of collid
er data. \nPDFs have a non-perturbative nature and Lattice QCD provides an
appropriate framework of their extraction. \nWe present results on the is
o-vector quasi-quark distribution functions using an ensemble of $N_f=2$ d
egenerate light quarks \nin the twisted mass formulation\, with pion mass
130MeV\, lattice spacing a=0.093 fm and lattice size $48^3 \\times 96$. \n
We discuss the non-perturbative renormalization procedure and the matching
to light-cone PDFs. \nAn overlap between lattice and phenomenological dat
a is found for a range of Bjorken-x values.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34853/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34853/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Composite phenomenology as a target for lattice QCD
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34852@indico.fnal.gov
DESCRIPTION:Speakers: Thomas DeGrand (University of Colorado)\nSome recent
beyond Standard Model phenomenology is based on new strongly interacting
dynamics\nof SU(N) gauge fields coupled to various numbers of fermions. Wh
en N=3 these systems are\nanalogues of QCD\, although the fermion masses a
re typically different from the ones of real world QCD.\nMany quantities
needed for phenomenology from these\nmodels have been computed on the latt
ice. We are writing a guide for these\nphenomenologists\, telling them abo
ut lattice results. I'll tell you what they are\ninterested in knowing.\n\
nhttps://indico.fnal.gov/event/15949/contributions/34852/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34852/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Preliminary results for the confining/deconfining transition of QC
D up to large \\mu/T
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34851@indico.fnal.gov
DESCRIPTION:Speakers: Manuel Scherzer (Institut for theoretical Physics He
idelberg University)\nWe perform CLE simulations both in the confining and
in the deconfining phases of QCD at large temperature and in a wide chemi
cal potential domain (up to \\mu/T ~10). We show preliminary results for t
he deconfining transition at \\beta = 5.9 for 2 flavors of Wilson fermions
. Most of the data are taken at rather large quark masses (m_\\pi ~ 1GeV)
and small spatial volumes (8^3 and 12^3 ). This and the\nstatistics do not
at present permit describing the character of the transition. These limit
ations are mainly due to computer time availability and we hope to soon im
prove on them. Some further tests on the method are also discussed.\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34851/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34851/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computation of hybrid static potentials from optimized trial state
s in SU(3) lattice gauge theory
DTSTART;VALUE=DATE-TIME:20180724T192000Z
DTEND;VALUE=DATE-TIME:20180724T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34850@indico.fnal.gov
DESCRIPTION:Speakers: Christian Reisinger (Goethe Universität Frankfurt a
m Main\, Institut für Theoretische Physik)\nWe compute hybrid static pote
ntials in SU(3) lattice gauge theory using a method to automatically gener
ate a large set of suitable creation operators from elementary building bl
ocks. This method allows us to find a set of creation operators\, which ge
nerate trial states with large ground state overlap for several angular mo
mentum and parity channels. We present results for the corresponding hybri
d static potentials. Moreover\, we study the flux tube structure using the
same creation operators and show preliminary results in SU(2) lattice gau
ge theory.\n\nhttps://indico.fnal.gov/event/15949/contributions/34850/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34850/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of multiflavor gauge theories
DTSTART;VALUE=DATE-TIME:20180726T174000Z
DTEND;VALUE=DATE-TIME:20180726T180000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34849@indico.fnal.gov
DESCRIPTION:Speakers: Diego Silva (The University of Iowa)\nA SU(3) gauge
theory with 12 flavors is a model of great interest for beyond the standar
d model physics. Running RHMC simulations for different masses and betas w
e study the Fisher zeroes in the vicinity of the endpoint of a line of fir
st order transitions. The pinching of these zeros with respect to increasi
ng volume provide information about a possible unconventional continuum li
mit. We also study the mass spectrum of a multiflavor linear sigma model w
ith a splitting of fermion masses.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34849/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34849/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$DK$ scattering and $D_{s0}(2317)$
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34848@indico.fnal.gov
DESCRIPTION:Speakers: Gavin Cheung (University of Cambridge)\nI will discu
ss a recent lattice QCD investigation of $DK$ scattering relevant for near
-threshold charm-strange mesons such as the enigmatic $D_{s0}(2317)$. By e
mploying a range of techniques\, we extracted finite-volume spectra in a n
umber of different channels. These were used to map out the energy depende
nce of the scattering amplitudes. The resonance and bound state content wa
s determined by studying the singularity structure of the amplitudes.\n\nh
ttps://indico.fnal.gov/event/15949/contributions/34848/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34848/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of strongly interacting four-fermion theory
DTSTART;VALUE=DATE-TIME:20180724T194000Z
DTEND;VALUE=DATE-TIME:20180724T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34847@indico.fnal.gov
DESCRIPTION:Speakers: Nouman Butt (Syracuse University)\nWe study a four d
mensional lattice model comprising four reduced staggered fermions coupled
to a scalar field through an SO(4) invariant interaction. Symmetries\nof
the lattice theory prohibit fermion mass terms. If we switch of the kineti
c\nterm for the scalar field we obtain a model with a four fermion interac
tion which has been the focus of several recent lattice investigations. Th
e results of those\ninvestigations has revealed that the pure four fermi
model\npossesses both massless and massive SO(4) symmetric phases separate
d by a very narrow symmetry broken phase. In this work we explore the phas
e diagram\nof the more general Yukawa model with a scalar kinetic term and
present evidence that one can pass from the massless to massive phases wi
thout\npassing through an intermediate broken phase.\n\nhttps://indico.fna
l.gov/event/15949/contributions/34847/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34847/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Computation of the Ghost Propagator in Linear Covariant Ga
uges
DTSTART;VALUE=DATE-TIME:20180723T211000Z
DTEND;VALUE=DATE-TIME:20180723T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34846@indico.fnal.gov
DESCRIPTION:Speakers: Paulo Silva (University of Coimbra)\nWe discuss the
subtleties concerning the lattice computation of the ghost propagator in l
inear covariant gauges\, and present preliminary numerical results.\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34846/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34846/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice N=4 three-dimensional super-Yang-Mills
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34845@indico.fnal.gov
DESCRIPTION:Speakers: Joel Giedt (Rensselaer Polytechnic Institute)\nWe ex
plain our recent formulation of this theory on the lattice\, and also disc
uss other formulations. Issues related to tuning and decoupling of auxili
ary sectors are examined. The continuum limit is explored.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34845/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34845/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress in the lattice simulations of Sp(2N) gauge theories
DTSTART;VALUE=DATE-TIME:20180724T192000Z
DTEND;VALUE=DATE-TIME:20180724T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34844@indico.fnal.gov
DESCRIPTION:Speakers: JONG-WAN Lee (Pusan National University)\nWe report
on the status of our program to simulate Sp(2N) gauge theories on the latt
ice. Motivated by the potential realization of SU(4)/Sp(4) ~ SO(6)/SO(5) c
omposite Higgs model\, we first consider Sp(4) theories with two Dirac fer
mion flavors in the fundamental representation. Preliminary results of mes
on spectrum will be presented along with discussion of the lattice systema
tics. Toward partial top compositeness in which additional fermions carry
SU(3) color quantum numbers we implement two-index antisymmetric Dirac fer
mions and explore the phase space of bare lattice parameters. We also pres
ent preliminary results of string tension and glueball mass spectrum in pu
re Sp(6) gauge theory. For all the numerical simulations we use the standa
rd Wilson lattice gauge and fermion actions.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34844/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34844/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First Glimpse of Glue Parton Distribution Function from Lattice QC
D
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34843@indico.fnal.gov
DESCRIPTION:Speakers: Zhouyou Fan (Michigan State University)\nParton dist
ribution functions (PDFs) are central to the study of the hadron scatterin
g cross sections with(within) collinear factorization. Recently\, the Larg
e-momentum effective theory (LaMET) introduced the quasi-PDF\, providing t
he possibility to explore the entire PDF instead of just the first few mom
ents. Since then\, a lot of studies have been done on the quark quasi-PDFs
. Compared to the quark PDF\, the glue PDF is less studied in theory but i
ts contribution is dominant in the production of Higgs bosons and heavy qu
arkonium. Here we provide the first numerical investigation of the glue qu
asi-PDF on the lattice with preliminary results.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34843/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34843/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the P-wave nucleon-pion scattering amplitude in the $\\Del
ta$ (1232) channel: interpolating fields and spectra
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34842@indico.fnal.gov
DESCRIPTION:Speakers: Giorgio Silvi (Forschungszentrum Jülich - Universit
y of Wuppertal)\nThe study of strong scattering in Lattice QCD is enabled
by the use of\nthe Luescher method\, which defines a mapping between the t
wo body\nspectrum in the finite volume and the infinite volume scattering\
namplitude. It however requires full and precise knowledge of the\nspectru
m in a given moving frame and irreducible representation. In this project
we investigate the $\\Delta$ (1232) resonance in the\npion-nucleon system.
The focus of the talk is on the group theoretical\nconstruction of single
and multi hadron interpolating fields in various\nmoving frames and irred
ucible representations. We construct a varied\nbasis of interpolating fiel
ds in all of the relevant irreducible\nrepresentations and determine the r
elevant energy levels.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34842/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34842/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon isovector axial charge in 2+1-flavor domain-wall QCD with
physical mass
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34841@indico.fnal.gov
DESCRIPTION:Speakers: Shigemi Ohta (IPNS\, KEK)\nThe current status of the
nucleon isovector axialvector charge calculation using a 2+1-flavor dynam
ical domain-wall QCD ensemble generated jointly by RBC and UKQCD Collabora
tions with essentially physical mass quarks and at lattice cut off of 1.73
0(4) GeV will be reported.\n\nhttps://indico.fnal.gov/event/15949/contribu
tions/34841/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34841/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The strange quark contribution to the spin of the nucleon
DTSTART;VALUE=DATE-TIME:20180725T221000Z
DTEND;VALUE=DATE-TIME:20180725T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34840@indico.fnal.gov
DESCRIPTION:Speakers: Roger Horsley (University of Edinburgh)\nQuark line
disconnected matrix elements of an operator\, such\nas the axial current\,
are difficult to compute on the lattice.\nThe standard method uses a stoc
hastic estimator of the operator\,\nwhich is very noisy. We discuss and fu
rther develop our alternative\napproach using the Feynman-Hellmann theorem
which involves\nonly evaluating two-point correlation functions. This is
applied\nto computing the contribution of the quark spin to the nucleon \n
and in particular for the strange quark.\n\nhttps://indico.fnal.gov/event/
15949/contributions/34840/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34840/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite volume matrix elements of two-body states
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34839@indico.fnal.gov
DESCRIPTION:Speakers: Alessandro Baroni (University of South Carolina)\nIn
this talk\, I will discuss a class of observables that are experimentall
y inaccessible but can be accessed via lattice QCD\, and how these will sh
ed light into the nature of low-lying QCD resonances and bound states. In
particular\, I consider the finite-volume two-body matrix elements with on
e current insertion\, and review the recently proposed formalism for relat
ing these to infinite-volume amplitudes. I will place emphasis on a new se
t of finite volume functions that emerge.\n\nhttps://indico.fnal.gov/event
/15949/contributions/34839/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34839/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On isospin breaking in tau decays for (g-2) from Lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34838@indico.fnal.gov
DESCRIPTION:Speakers: Mattia Bruno (BNL)\nHadronic spectral functions of t
au decays have been used in the past to provide an alternative determinati
on of the LO Hadronic Vacuum Polarization relevant for (g-2) of the muon.
Following recent developments and results in Lattice QCD+QED calculations\
, we explore the possibility of studying the isospin breaking corrections
of tau spectral functions for this prediction. We present preliminary resu
lts at physical pion mass based on Domain Wall Fermion ensembles generated
by the RBC/UKQCD collaboration\, which we compare and contrast with the p
revious phenomenological calculations.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34838/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34838/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral weak axial form factor and neutrino-nucleon scattering
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34837@indico.fnal.gov
DESCRIPTION:Speakers: David Richards (Jefferson Laboratory)\nUsing a combi
nation of lattice QCD calculation of the strange-quark form factors\, and
experimental (anti) neutrino differential cross-section data in a regime w
here nuclear effects are shown to be negligible\, we obtain a precise dete
rmination of the weak axial form factor in the regime $0\\le Q^2 \\le 1\\\
, {\\rm GeV}^2$\, and of the corresponding weak-axial charge. We are ther
eby able to reproduce the MiniBooNE and BNL E734 data for the (anti) neutr
ino-nucleus differential cross section to high precision\, showing that th
e nuclear corrections to the experimentally extracted cross section in thi
s kinematic regime are very small. The calculation will play an vital rol
e in understanding nuclear effects in neutrino-nucleus scattering.\n\nhttp
s://indico.fnal.gov/event/15949/contributions/34837/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34837/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High Precision Statistical Landau Gauge Lattice Gluon Propagator C
omputation
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34836@indico.fnal.gov
DESCRIPTION:Speakers: Paulo Silva (University of Coimbra)\nWe report on re
sults for the Landau gauge gluon propagator computed from large statistica
l ensembles and look at the compatibility of the results with the Gribov-Z
wanziger tree level prediction for its refined and very refined versions.
Our results show that the data is well described by the tree level estimat
e only up to momenta p ≲1 GeV\, while clearly favoring the so-called Ref
ined Gribov-Zwanziger scenario. We also provide a global fit of the lattic
e data which interpolates between the above scenario at low momenta and th
e usual continuum one-loop renormalization improved perturbation theory af
ter introducing an infrared log-regularizing term.\n\nhttps://indico.fnal.
gov/event/15949/contributions/34836/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34836/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on parton pseudo distributions II
DTSTART;VALUE=DATE-TIME:20180723T213000Z
DTEND;VALUE=DATE-TIME:20180723T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34835@indico.fnal.gov
DESCRIPTION:Speakers: Joseph Karpie (William and Mary)\, Savvas Zafeiropou
los (Universitaet Heidelberg)\nIn this presentation we will show theoretic
al developments that facilitate the better reconstruction of light cone pa
rton distributions starting from reduced Ioffe time pseudo distributions c
alculated on the lattice. We also present our new results of parton distri
butions for the nucleon and pion from an $N_{\\rm f}=2+1$ simulation of Wi
lson-clover fermions with stout smearing and tree-level tadpole improved S
ymanzik gauge action at two different lattice spacings. \nThis is the seco
nd of two consecutive talks on the subject.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34835/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34835/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson correlation functions at high temperature QCD: $SU(2)_{CS}$
symmetry vs. free quarks
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34834@indico.fnal.gov
DESCRIPTION:Speakers: Christian Rohrhofer (University of Graz)\nWe report
on the progress of understanding spatial correlation functions\nin high te
mperature QCD. We study isovector meson operators in Nf=2 QCD\nusing domai
n-wall fermions on lattices of Ns=32 and different quark\nmasses. It has p
reviously been found that at $\\sim 2 T_c$ these observables\nare not only
chirally symmetric but in addition approximately\n$SU(2)_{CS}$ and $SU(4)
$ symmetric. In this study we increase the\ntemperature up to $5T_c$ and c
an identify convergence towards an\nasymptotically free scenario at very h
igh temperatures.\n\nhttps://indico.fnal.gov/event/15949/contributions/348
34/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34834/
END:VEVENT
BEGIN:VEVENT
SUMMARY:String breaking with 2+1 dynamical fermions using the stochastic L
apH method
DTSTART;VALUE=DATE-TIME:20180724T190000Z
DTEND;VALUE=DATE-TIME:20180724T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34833@indico.fnal.gov
DESCRIPTION:Speakers: Vanessa Koch (Trinity College Dublin)\nThe static po
tential V(r) between a static quark and a static antiquark separated by\na
distance r is defined as the energy of the ground state of this system. A
s a consequence of confinement\, the energy between the quark-antiquark pa
ir is contained inside a color flux tube\, the so called string. As soon a
s the energy is high enough\, the gluonic string connecting the quarks wil
l break due to pair creation. \nString breaking is manifested as a quantum
-mechanical mixing phenomenon between different \nstates\, which contain t
wo infinitely heavy quarks acting as static color sources.\nWe investigate
this phenomenon with $N_f = 2+1$ flavors of dynamical Wilson fermions \ni
n the stochastic LapH framework\, using an ensemble of gauge configuration
s generated \nthrough the CLS effort. We see the effect of the third sea-q
uark flavor\, which results \nin a second mixing-phenomenon due to the for
mation of a strange-antistrange pair.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34833/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34833/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measuring of chiral susceptibility using gradient flow
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34832@indico.fnal.gov
DESCRIPTION:Speakers: Atsushi Baba (University of Tsukuba)\nIn the lattice
gauge theory with Wilson fermion\, chiral symmetry is explicitly broken.
A non-trivial additive correction is needed to renormalize the chiral cond
ensate. In this study\, we use gradient flow to avoid this problem. Gradie
nt flow makes us possible to define correctly renormalized chiral suscepti
bility without additive renormalization.\nWe measure not only disconnected
diagram but also connected diagram for chiral susceptibility. This measur
ement is on finite temperature full QCD with Nf=2+1 Wilson fermion\, and f
or temperature range 178-348 MeV.\n\nhttps://indico.fnal.gov/event/15949/c
ontributions/34832/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34832/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving Domain Wall Dirac Equation Using Multisplitting Preconditi
oned Conjugate Gradient
DTSTART;VALUE=DATE-TIME:20180723T211000Z
DTEND;VALUE=DATE-TIME:20180723T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34831@indico.fnal.gov
DESCRIPTION:Speakers: Jiqun Tu (Columbia)\nWe show that using the multispl
itting algorithm as a preconditioner for the conjugate gradient inversion
of domain wall fermion Dirac operators effectively reduces the inter-node
communication cost\, at the expense of performing more on-node floating po
int operations. Compared to Schwarz domain decomposition solver algorithms
our approach enforces Dirichlet boundary conditions consistently on the n
ormal preconditioned operator. This method would be useful for lattice Mon
te Carlo evolutions on supercomputers with far more on-node flops than int
er-node communication bandwidth.\n\nhttps://indico.fnal.gov/event/15949/co
ntributions/34831/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relational databases for lattice data analysis
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34830@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Hackett (University of Colorado\, Boulder)\nN
umerical studies in lattice gauge theory require the organization and anal
ysis of large volumes of data. These data and analyses thereof can be view
ed as a sequence of maps and reductions\, a structure that can be represen
ted naturally using relational databases. Organized in this way\, the anal
ysis of even large\, heterogenous datasets is straightforward to automate.
We present in abstract our methods to store\, organize\, and analyze latt
ice data\, as well as an outline of a functioning implementation using Pos
tgreSQL.\n\nhttps://indico.fnal.gov/event/15949/contributions/34830/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34830/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of nucleon sigma terms I
DTSTART;VALUE=DATE-TIME:20180725T211000Z
DTEND;VALUE=DATE-TIME:20180725T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34829@indico.fnal.gov
DESCRIPTION:Speakers: Lukas Varnhorst (University of Wuppertal)\nWe presen
t recent progress in the determination of nucleon sigma terms by the BMW c
ollaboration. In this talk the lattice setup and analysis methods are disc
ussed.\n\nhttps://indico.fnal.gov/event/15949/contributions/34829/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34829/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Control of SU(3) symmetry breaking effects in calculations of B me
son decay constant
DTSTART;VALUE=DATE-TIME:20180725T202000Z
DTEND;VALUE=DATE-TIME:20180725T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34828@indico.fnal.gov
DESCRIPTION:Speakers: Sophie Hollitt (University of Adelaide)\nEarly B phy
sics experiments have left us with a number of puzzles in heavy flavour ph
ysics. New lattice calculations and greater understanding of QCD effects i
n the Standard Model will be needed to support greater experimental precis
ion in the coming years. In particular\, the B meson decay constant is inv
olved in calculations of CKM matrix elements and useful to measurements of
the branching ratio B $\\to \\tau \\nu$ expected at the Belle II Experime
nt.\n\nWe extend the QCDSF studies of SU(3) breaking of light decay consta
nts into the heavy-flavour regime to examine the effects of SU(3) breakin
g on $f_B$ and $f_{B_s}$. $b$-quarks are generated using an anisotropic cl
over-improved heavy-quark action.\n\nThe decay constants $f_B$ and $f_{B_s
}$ will be presented for a variety of light quark masses\, from the SU(3)
symmetric point toward the physical quark masses. In order to focus on the
SU(3) symmetry breaking effects in our extrapolation to the physical poin
t\, we choose u\,d\,s quark masses in each simulation such that the averag
e quark mass\, $m = m_u + m_d + m_s $\, is constant and equal to its physi
cal value. Results will be presented at a number of different lattice spac
ings and volumes\, toward calculations of $f_B$ and $f_{B_s}$ at the physi
cal point.\n\nhttps://indico.fnal.gov/event/15949/contributions/34828/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34828/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of N=1 Super Yang-Mills theory from the gradient f
low
DTSTART;VALUE=DATE-TIME:20180727T231000Z
DTEND;VALUE=DATE-TIME:20180727T233000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34827@indico.fnal.gov
DESCRIPTION:Speakers: Camilo Lopez (University of Jena)\nComposite operato
rs of bare fermion fields evolved along a trajectory on field space by mea
ns of flow equations get renormalised multiplicatively. Therefore\, even i
n the case of Wilson fermions\, the renormalization of expectation values
of fermion operators can be simplified drastically on the lattice. We meas
ure the gluino condensate in N=1 supersymmetric Yang-Mills theory at non-z
ero temperatures by means of the gradient flow. The non-vanishing expectat
ion value of the gluino condensate up to a certain critical temperature is
a signal of chiral symmetry breaking\, in agreement with theoretical conj
ectures on the vacuum structure of the theory. Furthermore\, the deconfine
ment phase transition seems to occur close to this critical temperature\,
meaning that in N=1 SYM the phases of broken chiral symmetry and of confin
ement would coincide.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34827/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34827/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linear confinement and stress-energy tensor around static quark an
d anti-quark pair -- Lattice simulation with Yang-Mills gradient flow --
DTSTART;VALUE=DATE-TIME:20180723T221000Z
DTEND;VALUE=DATE-TIME:20180723T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34826@indico.fnal.gov
DESCRIPTION:Speakers: Ryosuke Yanagihara (Osaka University)\nWe study the
spatial distribution of the stress tensor around static quark-anti-quark p
air\nin SU(3) lattice gauge theory. In particular\, we reveal the transver
se structure of the stress tensor distribution in detail by taking the con
tinuum limit. The Yang-Mills gradient flow plays a crucial role to make th
e stress tensor well-defined and derivable from the numerical simulations
on the lattice [1].\n\n[1] R. Yanagihara et al.\, arXiv:1803.05656.\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34826/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34826/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mass Splitting in a Linear Sigma Model
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34825@indico.fnal.gov
DESCRIPTION:Speakers: Erik Gustafson (University of Iowa)\nWe examine mass
splittings in a linear sigma model which is an effective theory for a SU(
3) gauge theory with $N_1$ flavors of mass $m_1$ and $N_2$ flavors of mass
$m_2$. \nWe discuss the consequences for current simulations done by vari
ous collaborations. We explain the relevance for BSM model building.\n\nht
tps://indico.fnal.gov/event/15949/contributions/34825/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34825/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization on the fuzzy sphere
DTSTART;VALUE=DATE-TIME:20180723T202000Z
DTEND;VALUE=DATE-TIME:20180723T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34824@indico.fnal.gov
DESCRIPTION:Speakers: Kohta Hatakeyama (Shizuoka University)\nWe study ren
ormalization on the fuzzy sphere. We perform Monte Carlo simulation of a s
calar field theory on the fuzzy sphere\, which is described by a Hermitian
matrix model. We show that correlation functions defined by using the Ber
ezin symbol are made independent of the matrix size\, which plays a role o
f a UV cutoff\, by tuning a parameter of the theory. We also find that the
theories on the phase boundary are universal. They behave as a conformal
field theory at short distances\, while they show an effect of the UV/IR m
ixing at long distances.\n\nhttps://indico.fnal.gov/event/15949/contributi
ons/34824/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34824/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topology of two-color QCD at low temperature and high density
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34823@indico.fnal.gov
DESCRIPTION:Speakers: Etsuko Itou (RCNP\, Osaka University/Kouchi Universi
ty)\nWe study two-color QCD with nonzero chemical potential using Iwasaki
gauge and Wilson fermion action. \nThe two-color gauge theory coupled to a
n even number of fundamental fermions does not suffer from the sign proble
m because the fermion transforms in a real representation.\n\nTo perform t
he simulation even in high chemical potential regime\, as in earlier publi
cations\, we introduce a diquark source term into the action.\n\nIn this t
alk\, we show our results for the phase diagram in low temperature regime.
\nFurthermore\, we present the ¥mu dependence of the topological suscepti
bility.\n\nhttps://indico.fnal.gov/event/15949/contributions/34823/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34823/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaon Matrix Elements from Coarse Lattices
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34822@indico.fnal.gov
DESCRIPTION:Speakers: Robert Mawhinney (Columbia University)\nThe RBC and
UKQCD Collaborations have generated a number\nof coarse ensembles with 2+1
flavors of Mobius Domain Wall Fermions\n(MDWF) and physical quark masses
using the Iwasaki plus Dislocation\nSuppressing Determinant Ratio (DSDR) a
ction. Previous work has\nshown small $O(a^2)$ scaling violations for pse
udoscalar decay\nconstants\, various masses and Wilson flow scales. In th
is talk\,\nwe present results for $B_K$ and $\\Delta I = 2$ $K \\to \\pi \
\pi$\nmatrix elements on these lattices and compare these to continuum lim
it\nresults obtained for 2+1 flavor lattices with the Iwasaki gauge\nactio
n. The scaling of these matrix elements will help to determine\nthe utili
ty of measuring $\\Delta I = 0$ $K \\to \\pi \\pi$ matrix\nelements on lat
tices as coarse as $1/a = 1$ GeV.\n\nhttps://indico.fnal.gov/event/15949/c
ontributions/34822/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34822/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldline Approach to Few-Body Physics on the Lattice
DTSTART;VALUE=DATE-TIME:20180724T213000Z
DTEND;VALUE=DATE-TIME:20180724T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34821@indico.fnal.gov
DESCRIPTION:Speakers: Hershdeep Singh (Duke University)\nWe formulate a wo
rld-line approach to study few body physics on a space-time lattice and de
velop a worm type algorithm to extract the low lying energy levels. We sho
w that our formulation is efficient for studying non-relativistic spin-hal
f fermions with both attractive and repulsive interactions and in the pres
ence of mass imbalance\, especially in one spatial dimension. Recently\, s
uch systems have been studied using the complex Langevin approach\, since
the traditional auxiliary field formulations suffer from sign problems. Ou
r approach can be easily extended to higher dimensions for bosonic systems
without sign problems. For fermionic systems\, we study the severity of t
he sign problem in our formulation as a function of the particle number wi
th various types of interactions.\n\nhttps://indico.fnal.gov/event/15949/c
ontributions/34821/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34821/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parity-positive Baryon Spectra on Isotropic Lattice
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34820@indico.fnal.gov
DESCRIPTION:Speakers: Tanjib Khan (The College of William and Mary)\nWe pr
esent a calculation of the low-lying spectra for the positive-parity Delta
and Nucleon using the distillation approach applied on an isotropic $32^3
\\times 64$ lattice at a pion mass of around 360 MeV\, using a non-relati
vistic basis of operators together with so-called hybrid-type operators. T
he spectra are extracted from two-point functions using variational analys
is. The results are compared with lattice calculations at higher pion mass
es on an anisotropic lattice\, and a similar pattern emerges\, including i
n particular the presence of hybrid states in which gluonic degrees of fre
edom play a manifest role\, confirming the robustness of their observation
. The systematic uncertainties in the calculation are explored\, including
in particular the effect of varying the distillation space on the spectra
and a minimal number of distillation vectors is identified. The effect of
varying the distillation space on the calculation is explored and to obta
in a spectra with acceptable statistical error\, application of a minimum
number of distillation vector is proposed.\n\nhttps://indico.fnal.gov/even
t/15949/contributions/34820/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34820/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$K\\pi$ scattering and excited meson spectroscopy using the Stocas
tic LapH method
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34819@indico.fnal.gov
DESCRIPTION:Speakers: Ruairí Brett (Carnegie Mellon University)\nElastic
$I=1/2$\, $s$- and $p$-wave $K\\pi$ scattering amplitudes are simultaneous
ly\ncalculated using a Lüscher style analysis on a single ensemble of dyn
amical\nWilson-clover fermions at $m_\\pi \\sim 230$MeV. Partial wave mixi
ng due the reduced\nrotational symmetries of the finite volume is included
up to $\\ell=2$.\n\nWe also present finite-volume QCD spectra on two larg
e anisotropic lattices\n($32^3\\times256$\, $24^3\\times128$) with $m_\\pi
\\sim 230\, 390$MeV.\nIn each symmetry channel\, a large basis of one and
two hadron interpolating operators\nis employed with all-to-all quark pro
pagation treated using the stochastic LapH method.\n\nhttps://indico.fnal.
gov/event/15949/contributions/34819/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34819/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eigenvector Continuation with Auxiliary Field Monte Carlo
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34818@indico.fnal.gov
DESCRIPTION:Speakers: Dillon Frame (Michigan State University)\nEigenvecto
r Continuation is a new method designed to aid in the calculation of latti
ce observables in situations where conventional methods\, like perturbatio
n theory\, fails. We present the details of this method\, and results for
simulations of the Coulomb interaction in $^{4}$He and $^{8}$Be\, using bo
th Auxiliary Field Monte Carlo and Eigenvector Continuation.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34818/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34818/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-cone PDFs from lattice QCD
DTSTART;VALUE=DATE-TIME:20180723T190000Z
DTEND;VALUE=DATE-TIME:20180723T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34817@indico.fnal.gov
DESCRIPTION:Speakers: Krzysztof Cichy (Adam Mickiewicz University)\nUsing
the approach proposed a few years ago by X. Ji\, it has become feasible to
extract parton distribution functions (PDFs) from lattice QCD\, a task th
ought to be practically impossible before Ji's proposal. In this talk\, we
discuss the recent progress in this approach concerning renormalization a
nd matching and we set the stage for the following talk where results by t
he ETM Collaboration are presented at the physical pion mass. We also disc
uss the role of excited states in these computations and other systematic
effects that need to be controlled to ultimately have precise determinatio
ns of PDFs.\n\nhttps://indico.fnal.gov/event/15949/contributions/34817/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34817/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating quantum field theory with a quantum computer
DTSTART;VALUE=DATE-TIME:20180728T164500Z
DTEND;VALUE=DATE-TIME:20180728T173000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34816@indico.fnal.gov
DESCRIPTION:Speakers: John Preskill (Caltech)\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34816/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34816/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prony methods for extracting excited states
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34815@indico.fnal.gov
DESCRIPTION:Speakers: Kimmy Cushman (Yale University)\nA Prony method is a
n algebraic approach to extracting spectral energies from hadronic correla
tion functions. The simplest example is the effective mass commonly used
in lattice gauge theory. We show our exploration of this method to extrac
t multiple excited states for a pion point-point correlation function for
an SU(3) gauge theory with 8 flavors. We discuss our approach for dealing
with close lying states and noisy data.\n\nhttps://indico.fnal.gov/event/1
5949/contributions/34815/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34815/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization transition in SU(3) gauge theory
DTSTART;VALUE=DATE-TIME:20180724T213000Z
DTEND;VALUE=DATE-TIME:20180724T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34814@indico.fnal.gov
DESCRIPTION:Speakers: Réka Ágnes Vig (University of Debrecen)\nIt is kno
wn that at high temperature the lowest eigenmodes of the QCD Dirac \nopera
tor become localized. Since these localized modes appear around the cross-
over\ntemperature it is natural to ask how they are related to deconfineme
nt and \nchiral symmetry restoration. The simplest question one can ask in
this connection is\nwhether deconfinement and the appearance of localizat
ion happen at the same temperature. \nHowever\, in QCD there is no sharply
defined critical temperature since the transition is only a crossover. In
contrast\, having a well defined phase transition temperature\, the\nquen
ched theory naturally lends itself to studying whether localization\nand d
econfinement really happen at the same temperature. We analyze the statist
ics \nof staggered and overlap Dirac spectra on quenched SU(3) ensembles a
t several temperatures\njust above T_c. We precisely determine the tempera
ture where localized\nmodes appear in the Dirac spectrum and compare this
temperature with that of the \ndeconfinement transition.\n\nhttps://indico
.fnal.gov/event/15949/contributions/34814/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34814/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theory Challenges in EIC Physics
DTSTART;VALUE=DATE-TIME:20180727T140000Z
DTEND;VALUE=DATE-TIME:20180727T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34813@indico.fnal.gov
DESCRIPTION:Speakers: Xiangdong Ji (U. Maryland/Shanghai Jiao Tong Univers
ity)\nElectron-Ion Collider (EIC) is the highest priority for new construc
tion in US nuclear science community and will likely to start physics prog
ram in about 5-10 years from now.\nEIC enables to make detailed studies of
the parton structure of nucleons and nuclei in unprecedented accuracy and
kinematic domain. How to compute the EIC observables\, namely various par
ton distributions and fragmentations\, will become a grand challenges for
QCD theorists. In this talk\, some recent ideas and prospects\, including
lattice and quantum computations are discussed.\n\nhttps://indico.fnal.gov
/event/15949/contributions/34813/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34813/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing $\\hat{q}$ on a quenched SU(3) lattice
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34812@indico.fnal.gov
DESCRIPTION:Speakers: Amit Kumar (Wayne State University)\nThe jet transpo
rt coefficient $\\hat{q}$ is the leading parameter that controls the modif
ication of hard jets produced in heavy-ion collisions. This coefficient\,
like other jet coefficients is inherently non-perturbative\, and hence\, i
s challenging to compute from first principles. Currently\, existing theor
etical model to data comparisons require a separate normalization of $\\ha
t{q}$ between RHIC and LHC energies\, beyond the obvious $T^{3}$ scaling f
rom dimensional arguments. This is known as the jet $\\hat{q}$ puzzle. In
this talk\, we present a pQCD and lattice gauge theory based formulation t
o study $\\hat{q}$ which sheds new light on the non-perturbative nature of
$\\hat{q}$ and the jet puzzle. For this first attempt\, we formulate $\\h
at{q}$ within a quenched SU(3) lattice. We consider a leading order diagra
m for a hard parton passing through the thermal medium. The non-perturbati
ve part is expressed in terms of a non-local (two-point) Field-Strength-Fi
eld-Strength operator product which can be Taylor expanded after analytic
continuation to the Euclidean region. Such an expansion allowed us to writ
e $\\hat{q}$ in terms of the expectation of local operators. We also carry
out a perturbative analysis both on the lattice and in continuum field th
eory to understand the scale dependence of the jet transport coefficient.\
n\nhttps://indico.fnal.gov/event/15949/contributions/34812/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34812/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Structure Functions from the Feynman-Hellmann Theorem
DTSTART;VALUE=DATE-TIME:20180723T221000Z
DTEND;VALUE=DATE-TIME:20180723T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34811@indico.fnal.gov
DESCRIPTION:Speakers: Kim Somfleth (CSSM Adelaide University)\nBetter mode
l-independent theoretical predictions and input to parton distribution fun
ctions are vital to improving our understanding of how the nucleon is form
ed by quarks and gluons. By using a second order extension of the Feynman-
Hellmann theorem we examine the nucleon Compton form factor $F_1(\\omega\,
Q^2)$ without the need for calculations of four-point correlators. The cal
culation is performed for multiple lattice spacings\, volumes and a large
range of $Q^2$ up to $9 GeV^2$\, allowing examination of lattice artefacts
and higher twist contributions.\n\nhttps://indico.fnal.gov/event/15949/co
ntributions/34811/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34811/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First results for charm physics with a tmQCD valence action
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34810@indico.fnal.gov
DESCRIPTION:Speakers: Javier Ugarrio (IFT\, UAM-CSIC)\nWe present first pr
eliminary results for masses and decay constants of charmed mesons using a
valence Nf=2+1+1 fully-twisted tmQCD action combined with an Nf=2+1 non-p
erturbatively O(a)-improved Wilson sea sector. The impact of various techn
iques to reduce noise and improve spectroscopic resolution is presented\,
and the scaling of basic observables towards the continuum limit explored
in a subset of CLS ensembles.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34810/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34810/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Taking the continuum limit in Lattice Quantum Gravity
DTSTART;VALUE=DATE-TIME:20180723T190000Z
DTEND;VALUE=DATE-TIME:20180723T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34809@indico.fnal.gov
DESCRIPTION:Speakers: Jack Laiho (University of Glasgow)\nWe present a stu
dy of the relative lattice spacing of different ensembles in the Euclidean
dynamical triangulations approach to quantum gravity. We study the quant
um fluctuations of the semiclassical backgrounds about de Sitter space fol
lowing a similar analysis in causal dynamical triangulations and show how
this can be used to determine the relative lattice spacing in our analysis
. The agreement between this determination of the relative lattice spacin
g and that coming from a diffusion process lends support to the quantum gr
avity interpretation of our lattice formulation.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34809/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34809/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological structures in finite temperature QCD
DTSTART;VALUE=DATE-TIME:20180724T202000Z
DTEND;VALUE=DATE-TIME:20180724T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34808@indico.fnal.gov
DESCRIPTION:Speakers: Rasmus Larsen (Brookhaven National Laboratory\, Nucl
ear Theory Group)\nWe report our study on the properties of the topologica
l structures present in the QCD medium just above the chiral crossover tra
nsition. We use dynamical domain wall fermion configurations on lattices o
f size 32^3x8\, used earlier in [1] to calculate the crossover transition
temperature Tc in QCD\, and detect the topological structures through the
zero modes of the overlap operator. In particular\, their positions and s
patial and temporal widths are measured. We explicitly show that the prope
rties of the zero modes of the QCD Dirac operator agrees well with that of
calorons with non-trivial holonomy. Different profiles of the zero modes
are observed\, ranging from solutions that are localized in all four space
time dimensions\, to profiles that are localized in the spatial directions
\, and constant along the temporal extent of the lattice. This indicates t
owards the presence of instanton-dyons in the hot QCD medium just above Tc
\, where the distance between dyons control the shape and extent of the ze
ro modes.\n\n[1] QCD Phase Transition with Chiral Quarks and Physical Quar
k Masses \nPhys. Rev. Lett. 113\, 082001 (2014) \ndoi:10.1103/PhysRevLe
tt.113.082001 \n[arXiv:1402.5175 [hep-lat]]\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34808/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34808/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of Pion Valence Distribution form Hadronic Lattice Cro
ss Sections
DTSTART;VALUE=DATE-TIME:20180724T190000Z
DTEND;VALUE=DATE-TIME:20180724T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34807@indico.fnal.gov
DESCRIPTION:Speakers: Raza Sufian (Jef)\nRecently\, it has been shown that
a class of coordinate-space-separated non-local hadronic matrix elements\
, computable directly in lattice QCD\, can be factorized into parton distr
ibution functions with calculable coefficients\, in the same manner as the
hadronic cross sections measured in an experiment [Phys.Rev.Lett. 120 (20
18) no.2\, 022003]. The pion and kaon\, the lightest pseudo scalar mesons\
, provide an excellent theatre in which to explore these ideas. Furthermor
e\, the pion is of inherent theoretical interest and plays a vital role in
the understanding the nucleon and in nuclear structure. In this talk\, we
describe progress at understanding the valence quark distribution of the
pion using configuration-space separated gauge-invariant hadronic currents
.\n\nhttps://indico.fnal.gov/event/15949/contributions/34807/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34807/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed (and heavier) meson decay constants and heavy neutral meso
n mixing in the continuum limit using 2+1f of domain wall fermions
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34806@indico.fnal.gov
DESCRIPTION:Speakers: J Tobias Tsang (University of Edinburgh)\nI will pre
sent a status update of RBC/UKQCD's charm (to bottom) physics program base
d on ensembles with $N_f=2+1$ flavours of domain wall fermions featuring p
hysical pion masses.\n\nAfter a brief review of our program\, the main foc
us will be on mesonic decay constants and neutral meson mixing in the char
m and bottom sector\, where results for the bottom sector are obtained fro
m an extrapolation from the (heavier than) charm-quark mass region to the
physical $b$-quark mass. In particular\, I will focus on the ratio of the
pseudo-scalar decay constants $f_{D_s}/f_{D}$ and on the extrapolation of
the ratio $\\xi$ to the $b$-quark mass.\n\nhttps://indico.fnal.gov/event/1
5949/contributions/34806/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34806/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on relativistic three-particle quantization condition
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34805@indico.fnal.gov
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\nI present
an update on work extending and applying the relativistic three-particle
quantization conditions of Hansen/Sharpe\, and Brice\\~no/Hansen/Sharpe. T
his is based on work done in collaboration with Tyler Blanton\, Ra\\'ul Br
ice\\~no\, Max Hansen and Fernando Romero-Lopez. Topics include the numeri
cal implementation of the quantization condition in the isotropic approxim
ation\, the generalization of the formalism to include K-matrix poles\, an
d extending the description of the three-particle divergence-free K matrix
beyond the isotropic approximation.\n\nhttps://indico.fnal.gov/event/1594
9/contributions/34805/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34805/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confinement of quarks in higher representations in view of dual su
perconductivity.
DTSTART;VALUE=DATE-TIME:20180723T215000Z
DTEND;VALUE=DATE-TIME:20180723T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34804@indico.fnal.gov
DESCRIPTION:Speakers: Akihiro Shibata (KEK)\nDual superconductor picture
is a promising scenario for quark confinement. For quarks in the fundament
al representation\, we have presented a new formulation of Yang-Mills theo
ry on the lattice\, where decomposed restricted fields play the dominant r
ole in confinement\, and demonstrated numerical evidences for the dual
superconductivity. To establish this picture\, we must show evidences for
various situations\, e.g.\, for quarks in higher representations.\n\n I
n this talk\, we investigate the Wilson loops in higher representations. B
y virtue of the non-Abelian Stokes theorem\, we propose the suitable Wils
on loop operator made of the restricted field in the fundamental represent
ation\, so that it reproduces the correct behavior of the original Wilson
loop in the higher representation. We perform lattice simulations to measu
re the static quark potential using the Wilson loop operator in higher rep
resentations. We find that our proposed Wilson loop operators reproduce th
e correct behavior of the original Wilson loop average and overcome the pr
oblem that occurs in \nthe naively Abelian-projected Wilson loop operator
for higher representations.\n\nhttps://indico.fnal.gov/event/15949/contrib
utions/34804/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34804/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HAL QCD method and Nucleon-Omega interaction with physical quark m
asses
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34803@indico.fnal.gov
DESCRIPTION:Speakers: Takumi Iritani (RIKEN)\nAfter introducing the fundam
ental difficulties of the two-baryon systems in lattice QCD\, we review th
e severe problems in the previous studies by the direct method and reliabi
lities of the HAL QCD method. \nFrom the HAL QCD method\, we study Nucleon
-Omega interaction at almost physical quark masses. A strong attractive p
otential without a repulsive core is found in $^5$S$_2$ channel\, and we d
iscuss the possibility of the dibaryon formation.\n\nhttps://indico.fnal.g
ov/event/15949/contributions/34803/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34803/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD Anderson transition with Nf=2+1+1 twisted mass Wilson quar
ks
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34802@indico.fnal.gov
DESCRIPTION:Speakers: Lukas Holicki (JLU Giessen)\nChiral Random Matrix Th
eory has proven to describe the spectral prop-\nerties of low temperature
QCD very well. However\, at temperatures above\nthe chiral symmetry restor
ing transition it can not provide a global descrip-\ntion. The level-spaci
ng distribution in lower part of the spectrum of the\nDirac operator is Po
isson-like. The eigenmodes are localized in space-time\nand separated from
the rest of the spectrum by a so-called mobility edge. In\nanalogy to And
erson localization in condensed-matter systems with random\ndisorder this
has been called the QCD-Anderson transition.\nHere\, we study the localiza
tion features of the low-lying eigenmodes of\nthe massless overlap operato
r on Nf=2+1+1 twisted mass Wilson sea\nquarks and present results concerni
ng the temperature dependence of the\nmobility edge and the mechanism of t
he quark-mode localization. We have\nused various methods to fix the spect
ral position of the delocalization transi-\ntion and verify that the mobil
ity edge extrapolates to zero at a temperature\nwithin the chiral transiti
on region.\n\nhttps://indico.fnal.gov/event/15949/contributions/34802/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34802/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon charges and quark momentum fraction with $N_f=2+1$ Wilson
fermions
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34801@indico.fnal.gov
DESCRIPTION:Speakers: Konstantin Ottnad (University of Mainz)\nWe present
a nucleon structure analysis including the charges of isovector dimension-
three operators as well as the forward matrix elements of twist-2\, dimens
ion-four operators. Computations are performed on CLS ensembles with $N_f=
2+1$ Wilson fermions\, covering four values of the lattice spacing and pio
n masses down to $M_\\pi \\approx 200\\\,\\mathrm{MeV}$. Several source-si
nk separations (typically $\\sim 1.0\\\,\\mathrm{fm}$ to $\\sim 1.5\\\,\\m
athrm{fm}$) allow us to assess excited-state contaminations. Results on ea
ch ensemble are obtained from simultaneous two-state fits including all ob
servables and all available source-sink separations with the mass gap as a
free fit parameter. Finally\, the chiral and continuum extrapolation is p
erformed to extract physical results.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34801/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34801/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Follow-up on non-leptonic Kaon decays at large $N_c$
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34800@indico.fnal.gov
DESCRIPTION:Speakers: Fernando Romero-Lopez (University of Valencia\, IFIC
)\nIn this work we present our latest results about the K $\\to$ $\\pi$ ma
trix elements at large $N_c$\, including the exploration of the mass depen
dence and the latest simulations with $N_f=4$ dynamical fermions.\n\nhttps
://indico.fnal.gov/event/15949/contributions/34800/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34800/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leading hadronic contribution to muon g-2 from lattice QCD and the
MUonE experiment
DTSTART;VALUE=DATE-TIME:20180725T143000Z
DTEND;VALUE=DATE-TIME:20180725T150000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34799@indico.fnal.gov
DESCRIPTION:Speakers: Krstic Marinkovic Marina (CERN/Trinity College Dubli
n)\nThe dominating uncertainty in the Standard Model prediction of the muo
n g-2 is coming from the hadronic contributions. The Muon g-2 experiment a
t Fermilab has started the major data collection and the aimed four-fold i
ncrease in precision will shed light on the current discrepancy between th
e theory prediction and the measured value. A reciprocal effort to directl
y measure the hadronic contributions to the running of the fine structure
constant has been proposed by the MUonE experiment\, which is part of the
Physics Beyond Colliders program at CERN. MUonE will get a measurement of
the HVP contribution from the scattering of the high-energy muons on the f
ixed electron target.\n\nLattice QCD and MUonE experiment measure high acc
uracy HVP in the complementary momenta ranges. Thus\, a hybrid strategy in
cluding both experimental and lattice data sets is expected to give an ind
ependent check of the current dispersive results from e+e- annihilation\,
which dominate the current world average. In this talk\, I will present a
first estimate of the lattice contribution to the hybrid HVP\, which will
be combined with the outcome of the MUonE experiment. Furthermore\, using
a physically motivated model for the I=1 vacuum polarization (Golterman et
al.'13)\, we give the projected precision for the MUonE’s measurement o
f the HVP in the low momentum region.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34799/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34799/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon-pion-state contamination in the lattice determination of t
he axial form factors of the nucleon
DTSTART;VALUE=DATE-TIME:20180725T190000Z
DTEND;VALUE=DATE-TIME:20180725T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34798@indico.fnal.gov
DESCRIPTION:Speakers: Oliver Baer (Humboldt University Berlin)\nThe nucleo
n-pion-state ($N\\pi$) contribution to QCD two- and three-point functions
used in the calculation of the axial form factors of the nucleon are studi
ed in chiral perturbation theory. For physical quark masses the $N\\pi$ st
ates are expected to dominate the excited-state contamination at large euc
lidean time separations. To leading order in chiral perturbation theory th
e results depend on two experimentally well-known low-energy constants onl
y and the $N\\pi$-state contamination can be reliably estimated. In the ax
ial form factor $G_A(Q^2)$ it amounts to a 5 percent overestimation for so
urce-sink separations of about 2 fm and shows essentially no dependence on
the momentum transfer $Q^2$. In contrast\, for the induced pseudo-scalar
form factor $G_P(Q^2)$ the $N\\pi$-state contamination shows a much stron
ger dependence on $Q^2$ and leads to a 20-40 percent underestimation of $G
_P(Q^2)$ at small momentum transfers.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34798/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34798/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The leading hadronic contribution to $\\sin^2\\theta_W$ running an
d covariant coordinate-space methods
DTSTART;VALUE=DATE-TIME:20180727T204000Z
DTEND;VALUE=DATE-TIME:20180727T210000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34797@indico.fnal.gov
DESCRIPTION:Speakers: Marco Cè (Helmholtz-Institut Mainz\, Johannes Guten
berg-Universität Mainz)\nWe present a preliminary study of the leading ha
dronic contribution to the running of the electroweak mixing angle $\\thet
a_W$. The running is extracted from the correlation function of the electr
omagnetic current with the (vector part of the) weak neutral current using
the Lorentz-covariant coordinate-space method recently introduced by Meye
r. Both connected and disconnected contributions have been computed on $N_
f=2+1$ non-perturbatively $\\mathcal{O}(a)$-improved Wilson fermions confi
gurations.\nSimilar covariant coordinate-space methods can be used to comp
ute the leading hadronic contribution to the anomalous magnetic moment $g-
2$ of the muon and to the running of the QED coupling $\\alpha$.\n\nhttps:
//indico.fnal.gov/event/15949/contributions/34797/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34797/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion distribution amplitude from Euclidean correlation functions:
Universality and higher-twist effects
DTSTART;VALUE=DATE-TIME:20180725T194000Z
DTEND;VALUE=DATE-TIME:20180725T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34796@indico.fnal.gov
DESCRIPTION:Speakers: Philipp Wein (Universität Regensburg)\nWe study the
feasibility to extract the leading twist pion distribution amplitude (DA)
and the higher twist normalization constant from suitably chosen Euclidea
n correlation functions with two local currents at a spacelike separation.
We demonstrate the advantages of considering several correlation function
s simultaneously and extracting the pion DA from a global fit. This positi
on space approach is complementary to the calculation of the lowest moment
s of the DA using the Wilson operator product expansion and avoids mixing
with lower dimensional local operators on the lattice. We will highlight s
imilarities and differences to closely related methods that use quasi- or
pseudo-distributions.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34796/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34796/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SYM flow equation in N=1 SUSY
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34795@indico.fnal.gov
DESCRIPTION:Speakers: Daisuke Kadoh (Keio University)\nIn this talk\, we s
how that the gradient flow equation is defined in ${\\small\\cal N} = 1$ S
YM in a way that is consistent with supersymmetry in the Wess-Zumino gauge
. Using the perturbation theory\, we find that two-point function of flowe
d gauge multiplet is UV-finite at the one-loop level when four dimensional
SYM is renormalized.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34795/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34795/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multilevel integration for meson propagators
DTSTART;VALUE=DATE-TIME:20180723T200000Z
DTEND;VALUE=DATE-TIME:20180723T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34794@indico.fnal.gov
DESCRIPTION:Speakers: Alessandro Nada (DESY Zeuthen)\nThe computation of h
adronic correlation functions in lattice QCD is severely hindered by a sig
nal-to-noise ratio that exponentially decreases with the distance between
source and sink.\nRecent developments for the factorization of both the fe
rmion propagator and the fermion determinant pave the way for the implemen
tation of multilevel Monte Carlo integration techniques\, which are alread
y known to provide a solution to this problem in pure gauge theory.\nIn th
is talk\, we discuss a novel strategy to compute the leading factorized co
ntribution to connected meson propagators based on noise sources.\nFinally
\, results for vector and scalar meson propagators obtained using this tec
hnique will be presented and their numerical effectiveness will be compare
d to that of a standard Monte Carlo simulation.\n\nhttps://indico.fnal.gov
/event/15949/contributions/34794/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34794/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The perturbative SU(N) one-loop running coupling in the twisted gr
adient flow scheme
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34793@indico.fnal.gov
DESCRIPTION:Speakers: Eduardo Ibanez Bribian (Instituto de Fisica Teorica
UAM-CSIC)\nWe report on our computation of the perturbative running of the
't Hooft coupling in a pure gauge SU(N) theory with twisted boundary cond
itions. The computation was performed using gradient flow methods in four
dimensions\, in the continuum\, and using dimensional regularisation. The
coupling is defined in terms of the energy density of the flow fields at a
scale given by a particular combination of the linear size of the torus a
nd the rank of the gauge group. We will present our strategy to regulate t
he divergences for a generic twist tensor\, along with our results for the
case of a two-dimensional non-trivial twist\, analysing the dependence of
the coupling with the finite size of the torus and the rank of the group\
, as well as the dependence on the magnetic flux induced by the twist.\n\n
https://indico.fnal.gov/event/15949/contributions/34793/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34793/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Lefschetz thimbles regularization of heavy-dense QCD
DTSTART;VALUE=DATE-TIME:20180723T211000Z
DTEND;VALUE=DATE-TIME:20180723T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34792@indico.fnal.gov
DESCRIPTION:Speakers: Kevin Zambello (University of Parma and INFN)\nAt fi
nite density\, lattice simulations are hindered by the well-known sign pro
blem: for finite chemical potentials\, the QCD action becomes complex and
the Boltzmann weight e^-S\ncannot be interpreted as a probability distribu
tion to determine expectation values by Monte Carlo techniques. Different
workarounds have been devised to study the QCD phase diagram\, but their a
pplication is mostly limited to the region of small chemical potentials.\n
The Lefschetz thimbles method takes a new approach in which one complexifi
es the theory and deforms the integration paths. By integrating over Lefsc
hetz thimbles\,the imaginary part of the action is kept constant and can b
e factored out\, while e^-Re(S) can be interpreted as a probability measur
e. The method has been applied in recent years to more or less difficult p
roblems. Here we report preliminary results on Lefschetz thimbles regulari
zation of heavy-dense QCD. While still simple\, this is a very interesting
problem. It is a first look at thimbles for QCD\, although in a simplifie
d\, effective version. From an algorithmic point of view\, it is a nice gr
ound to test effectiveness of techniques we developed for multi thimbles s
imulations.\n\nhttps://indico.fnal.gov/event/15949/contributions/34792/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34792/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Taylor expansion and the Cauchy Residue Theorem for finite-density
QCD
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34791@indico.fnal.gov
DESCRIPTION:Speakers: Benjamin Jaeger (CP3 &\; DIAS\, University of Sou
thern Denmark)\nThe QCD pressure at non-zero chemical potential mu is typi
cally obtained\nvia a Taylor expansion in mu. The Taylor coefficients are
traces of \npowers of the inverse Dirac matrices\, which are computed usin
g many noisy\nestimators. Here\, we present an alternative based on the Ca
uchy Residue Theorem and discuss its merits for the Taylor coefficients.\n
\nhttps://indico.fnal.gov/event/15949/contributions/34791/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34791/
END:VEVENT
BEGIN:VEVENT
SUMMARY:OpenCL Library for Computing Disconnected Contributions using FPGA
s
DTSTART;VALUE=DATE-TIME:20180725T213000Z
DTEND;VALUE=DATE-TIME:20180725T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34789@indico.fnal.gov
DESCRIPTION:Speakers: Ahmed Yousif (Michigan State University)\nWe introdu
ce an OpenCL library for computation of disconnected contributions for app
lication with FPGAs and GPUs. We look at the advantages of FPGAs vs. tradi
tional GPUs for stochastic estimation of disconnected contributions\, as w
ell as gains achieved with enhancements such as mixed precision and the tr
uncated solver method. We also prospectively consider variance reduction a
lgorithms and the advantages that can be provided with FPGAs.\n\nhttps://i
ndico.fnal.gov/event/15949/contributions/34789/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34789/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On two-flavor QCD(adj)
DTSTART;VALUE=DATE-TIME:20180725T202000Z
DTEND;VALUE=DATE-TIME:20180725T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34788@indico.fnal.gov
DESCRIPTION:Speakers: Mohamed Anber (Lewis &\; Clark College)\nI use th
e traditional and more recently discovered 1-form discrete 't Hooft anomal
y matching conditions and propose a novel realization of the symmetries of
SU(2) Yang-Mills theory with two massless adjoint Weyl fermions in the st
rongly-coupled regime. The theory has a spectrum identical to the one obta
ined by compactifying it on a small circle. This offers a new perspective
on the lattice studies of this theory\, which is among a class of models p
roposed to realize the electroweak symmetry breaking. I also discuss that
there is a bigger class of theories that undergo no phase transition betwe
en the small-size and infinite-size circle.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34788/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34788/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Updated spectroscopy for SU(3) with eight fundamental flavors
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34787@indico.fnal.gov
DESCRIPTION:Speakers: Ethan Neil (University of Colorado\, Boulder)\nI pre
sent updated spectroscopy results from the LSD collaboration on\nSU(3) gau
ge theory with $N_f=8$ degenerate fermions in the fundamental\nrepresentat
ion\, using nHYP-smeared staggered fermions. The new results\ninclude add
ed statistics\, a more sophisticated systematic error analysis\,\nand the
use of joint fits to stabilize estimates of the $0^{++}$ scalar\nmeson mas
s. We find persistent evidence for a very light $0^{++}$ scalar\,\nroughl
y degenerate with the pions and far below the rest of the spectrum.\nA det
ailed comparison with the $N_f=4$ theory using the same lattice action\nis
also presented.\n\nhttps://indico.fnal.gov/event/15949/contributions/3478
7/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34787/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion Distribution Amplitude from lattice QCD: towards the continuu
m limit
DTSTART;VALUE=DATE-TIME:20180724T202000Z
DTEND;VALUE=DATE-TIME:20180724T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34786@indico.fnal.gov
DESCRIPTION:Speakers: Piotr Korcyl (Jagiellonian University and University
of Regensburg)\nWe present the current status of a non-perturbative latti
ce calculation of the pion distribution amplitude by the RQCD collaboratio
n. Our investigation is carried out using $N_f=2+1$ dynamical\, non-pertur
batively O(a)-improved Wilson fermions on the CLS ensembles with 5 differe
nt lattice spacings and pion masses down to the physical pion mass. A comb
ined continuum and chiral extrapolation to the physical point is performed
along two independent quark mass trajectories simultaneously. We employ m
omentum smearing in order to decrease the contamination of excited states
and increase statistical precision.\n\nhttps://indico.fnal.gov/event/15949
/contributions/34786/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34786/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$SU(2)$ Lattice Gauge Pair Hopping Constructs Suitable for Impleme
ntation on Quantum Computers
DTSTART;VALUE=DATE-TIME:20180724T215000Z
DTEND;VALUE=DATE-TIME:20180724T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34785@indico.fnal.gov
DESCRIPTION:Speakers: Patrick Dreher (NC State University)\nA traditional
approach for constructing a gauge field theory on a lattice employs a basi
c Wilson type procedure with additional enhancements to this formulation i
n order to improve computational performance and accuracy. This type of l
attice gauge formulation has been successfully implemented on many differe
nt high performance computing systems and has yielded useful computational
results. With the recent advances in quantum computing\, the question th
at is now being asked is whether an equivalent type of gauge invariant for
mulation of a field theory can be constructed on a quantum computer. Usin
g the Quantum Link Model (QLM) plus the concept of rishons\, a gauge invar
iant mathematical construction of a lattice field theory will be summarize
d. In this formulation\, the number of fermionic rishons per link plays a
n important role in the order of the gauge group that can be constructed.
Using this formulation\, it may be possible to implement a simple lattice
field theory on a quantum computer. This talk will specifically focus on
the $SU(2)$ QLM formulation\, discuss the physics that may potentially be
simulated on a quantum computer with this construct\, and speculate on th
e prospects for having quantum computers become a part of the set of hardw
are platforms for lattice gauge theory simulations in the future.\n\nhttps
://indico.fnal.gov/event/15949/contributions/34785/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34785/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange Quark Content of the Nucleon using the Yang-Mills gradient
flow
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34784@indico.fnal.gov
DESCRIPTION:Speakers: Jose Gabriel Reyes-Rivera (Michigan State University
)\nThe Yang-Mills gradient flow can be used to calculate the strange quark
scalar content in nucleons using Lattice QCD. Given the renormalization
properties of flowed operators\, the procedure promises a reduction of the
uncertainties in the determination of the spin independent (SI) elastic c
ross section of dark matter models involving WIMP-nucleon interactions. Ch
iral symmetry and a small flow-time expansion relate the scalar density at
zero flow time to the pseudo-scalar density at non-zero flow time which c
an be calculated accurately on a lattice. The pseudo-scalar density is cal
culated on a 32^3×64 lattice using 2+1 flavor QCD gauge field configurati
ons by PACS-CS with a spacing of a=0.0907 fm\, β=1.90\, m_π≅411 MeV. W
e show a preliminary result for the flow-time dependent vacuum to pion mat
rix elements and we discuss how it can be used to extract the strange quar
k scalar content in nucleons.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34784/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34784/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New results on the emergent light BSM scalar as 0++ sigma-particle
or dilaton
DTSTART;VALUE=DATE-TIME:20180725T190000Z
DTEND;VALUE=DATE-TIME:20180725T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34783@indico.fnal.gov
DESCRIPTION:Speakers: Julius Kuti (U.C. San Diego)\nNew results are discus
sed on the effective field theory of the light 0++ scalar in an important
near-conformal strongly coupled BSM gauge theory and its lattice simulatio
ns in the sextet fermion representation. Relevant for the composite BSM Hi
ggs\, two distinct scenarios are introduced for the emergent light scalar
as the composite σ-particle of chiral symmetry breaking or the dilaton of
conformal symmetry breaking. An important new method for the anomalous di
mension of the chiral condensate is presented for the cross-validation of
dilaton signatures in goldstone dynamics and its extensions.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34783/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34783/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-neutrino exchange and long-distance contributions to neutrin
oless double beta decay
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34782@indico.fnal.gov
DESCRIPTION:Speakers: Xu Feng (Peking University)\nRecently four experimen
ts have demonstrated new levels of sensitivity to neutrinoless double beta
($0\\nu\\beta\\beta$) decay. Such decay\, if exists\, would prove that ne
utrinos are Majorana fermions. The light-neutrino exchange is the most pop
ular mechanism to explain the $0\\nu\\beta\\beta$ decay. In this mechanism
\, the decay amplitude is proportional to the effective neutrino mass $m_{
\\beta\\beta}$ and thus the detection of $0\\nu\\beta\\beta$ decay would p
rovide the information about the absolute neutrino mass. We report the lat
tice QCD calculation of the $0\\nu\\beta\\beta$ decay amplitude\, which in
volves light-neutrino exchange and significant long-distance contributions
.\n\nhttps://indico.fnal.gov/event/15949/contributions/34782/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34782/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fate of a recent conformal fixed point and beta-function in the SU
(3) BSM gauge theory with ten massless flavors
DTSTART;VALUE=DATE-TIME:20180725T200000Z
DTEND;VALUE=DATE-TIME:20180725T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34781@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Nogradi (Eotvos University Budapest - Univers
idad Autonoma Madrid)\nWe report new results on the beta-function of an im
portant BSM gauge \ntheory with ten massless fermion flavors in the fundam
ental \nrepresentation of the SU(3) color gauge group. The existence of an
\ninfrared fixed point (IRFP) was reported in [PoS LATTICE2016 (2017) 228
] at $g^2 \\sim 7.0$ of the renormalized gauge coupling. We find a positiv
e and rapidly increasing beta-function in the extended gauge coupling rang
e $5 \n\nhttps://indico.fnal.gov/event/15949/contributions/34781/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34781/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryons and Interactions in Magnetic Fields
DTSTART;VALUE=DATE-TIME:20180725T215000Z
DTEND;VALUE=DATE-TIME:20180725T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34780@indico.fnal.gov
DESCRIPTION:Speakers: Amol Deshmukh (The Graduate Center\, CUNY)\nMotivate
d by lattice QCD calculations in external fields\, we study the behavior o
f single- and few-baryon systems in large magnetic fields. The dependence
of single-baryon energies on magnetic fields is explored using chiral dyna
mics. Lattice calculations are argued to provide a valuable diagnostic on
the chiral expansion for baryons. In particular\, we show the unsatisfacto
ry state of predictions for hyperon magnetic polarizabilities. For two-bod
y systems\, lattice calculations by the NPLQCD collaboration suggest that
unitary nucleon interactions may be attained by tuning the magnetic field.
The possibility of such universality is investigated using effective fie
ld theory to address the modification of two-nucleon interactions in large
magnetic fields.\n\nhttps://indico.fnal.gov/event/15949/contributions/347
80/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34780/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three neutrons from Lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34779@indico.fnal.gov
DESCRIPTION:Speakers: Jan-Lukas Wynen (Forschungszentrum Jülich)\nWe pres
ent a study on ab-initio calculations of three-neutron correlators\, and m
ore generally\, three-nucleon correlators\, from Lattice QCD. Baryon block
s have been employed to simulate two nucleon systems in the past. We exten
d the method to three nucleons. In addition\, we use automatic code genera
tion to provide more flexibility and allow for easy inclusion of additiona
l channels in the future while optimizing the evaluation of sub-expression
s. We present some preliminary results of our calculations.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34779/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34779/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauss' Law\, Duality\, and the Hamiltonian Framework of Lattice Ga
uge Theory
DTSTART;VALUE=DATE-TIME:20180725T200000Z
DTEND;VALUE=DATE-TIME:20180725T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34778@indico.fnal.gov
DESCRIPTION:Speakers: Jesse Stryker (University of Washington)\nQuantum co
mputers have the potential to solve certain problems in lattice gauge theo
ry that are thought to be exponentially hard for classical computers. The
proposed starting point for such computations has been the Kogut-Susskind
Hamiltonian supplemented by the Gauss law constraint\, with a cutoff on el
ectric field values. There are several disadvantages to this approach\, in
cluding having to simulate the vast unphysical part of the Hilbert space.
We consider pure U(1) gauge theory\, and motivated to restrict the calcula
tion to purely physical states\, are immediately led to a duality transfor
mation. This approach to formulating lattice gauge theory for quantum com
puters could have some advantages\, and we speculate on how it might be ex
tended to include matter and non-Abelian gauge groups.\n\nhttps://indico.f
nal.gov/event/15949/contributions/34778/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34778/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reweighting Lefschetz Thimbles
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34777@indico.fnal.gov
DESCRIPTION:Speakers: Felix Ziegler (Institute for Theoretical Physics\, H
eidelberg University)\nOne of the main challenges in simulations on Lefsch
etz thimbles is the computation of the relative weights of contributing th
imbles. In this paper we propose a solution to that problem by means of co
mputing those weights using a reweighting procedure. Besides we present re
cipes for finding parametrizations of thimbles and anti-thimbles for a giv
en theory. Moreover\, we study some approaches to combine the Lefschetz th
imble method with the Complex Langevin evolution. Our numerical investigat
ions are carried out by using toy models among which we consider a one-sit
e z^4 model as well as a U(1) one-link model.\n\nhttps://indico.fnal.gov/e
vent/15949/contributions/34777/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34777/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmonium-nucleon interactions from 2+1 flavor lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T231000Z
DTEND;VALUE=DATE-TIME:20180727T233000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34776@indico.fnal.gov
DESCRIPTION:Speakers: Takuya Sugiura (RCNP\, Osaka University)\nIn this ta
lk we report on the lattice QCD calculations of the interactions between a
charmonium (either $\\eta_c$ and $J/\\psi$) and a nucleon. We use the met
hod introduced by the HAL QCD collaboration to compute potentials\, which
guarantees the interaction to be faithful to the QCD S-matrix below the op
en-charm threshold. Our lattice simulation is performed with $2+1$ flavor
full QCD gauge configurations on a $32^3\\times 64$ lattice generated by t
he CP-PACS and JLQCD collaborations. The relativistic heavy quark action i
s employed for charm quarks. We find that both $\\eta_c N$ and $J/\\psi N$
are weakly attractive\, but not strong enough to have a bound state.\n\nh
ttps://indico.fnal.gov/event/15949/contributions/34776/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34776/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electric Dipole Moment Results from Lattice QCD
DTSTART;VALUE=DATE-TIME:20180724T190000Z
DTEND;VALUE=DATE-TIME:20180724T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34775@indico.fnal.gov
DESCRIPTION:Speakers: Jack Dragos (FRIB NSCL MSU)\nWe utilize the gradient
flow to define and calculate electric dipole moments (EDMs) induced by th
e\nstrong QCD $\\theta$-term.\nSince the EDM is highly sensitive to the CP
-violating operator induced in the action\,\nthe Euclidean time dependence
of the topological charge is utilized to improve the signal to noise.\n\n
The results of the nucleon EDMs are calculated on PACS-CS gauge fields (av
ailable from the ILDG)\nusing $N_{f}=2+1$.\nThese gauge fields use a renor
malization-group improved gauge action and\na non-perturbatively $O(a)$ im
proved clover quark action.\n\nThe main calculation was performed on a $32
^{3}\\times 64$ lattice with lattice spacing\n$a \\simeq 0.09$ fm ($\\beta
= 1.90$)\, with pion masses of\n$m_{\\pi} \\simeq 411\,570\,701$ MeV to p
erform a chiral extrapolation (with $c_{SW} = 1.715$).\nA second set of ca
lculations were performed with $a\\simeq 0.1215\,0.0980\,0.0685$ fm\nat $L
\\approx1.9$ fm for continuum limit studies.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34775/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34775/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD at non-zero density and phenomenology
DTSTART;VALUE=DATE-TIME:20180723T163000Z
DTEND;VALUE=DATE-TIME:20180723T171500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34774@indico.fnal.gov
DESCRIPTION:Speakers: Claudia Ratti Ratti (University of Houston)\nIn the
last few years\, numerical simulations of QCD on the lattice have reached
a new level of accuracy. A wide range of thermodynamic quantities is now a
vailable in the continuum limit and for physical quark masses. This allows
a comparison with measurements from heavy ion collisions for the first ti
me. I will review the state-of-the-art results from lattice simulations of
QCD thermodynamics and connect them to experimental measurements from RHI
C and the LHC.\n\nhttps://indico.fnal.gov/event/15949/contributions/34774/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34774/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperon Axial Couplings at Physical Pion Mass
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34773@indico.fnal.gov
DESCRIPTION:Speakers: Aditya Savanur (Michigan State University)\nThe hype
ron axial couplings are important parameters\nentering the low-energy effe
ctive field theory description\nof the octet baryons. In addition\, the co
upling constants appear \nin the non-leptonic decays of hyperons\, and hyp
eron-hyperon and \nhyperon-nucleon scattering processes\, which can be use
d in the \ndescription of neutron stars. In this poster\, we present preli
minary \nresults on the Sigma-Sigma and Xi-Xi axial couplings calculated a
t \na=0.09fm near physical pion mass with clover/HISQ actions.\n\nhttps://
indico.fnal.gov/event/15949/contributions/34773/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34773/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bethe-Salpeter wavefunctions of hybrid charmonia
DTSTART;VALUE=DATE-TIME:20180725T221000Z
DTEND;VALUE=DATE-TIME:20180725T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34772@indico.fnal.gov
DESCRIPTION:Speakers: Yunheng Ma (Institute of High Energy Physics\, Chine
se Academy of Sciences)\nThe charmonium-like hybrid mesons with $J^{PC}=(0
\,1\,2)^{-+}$ and $1^--$ are investigated on anisotropic lattices in the q
uenched approximation. For these states\, we construct spatially extended
operators by splitting the $\\bar{c}\\Gamma c B$-type operators into two p
arts ($c\\bar{c}$ and the chromo-magnetic field strength $B$) with differe
nt spatial distances $r$. In the Coulomb gauge\, the matrix elements of th
ese operators between the vacuum and the corresponding states are interpre
ted as Bethe-Salpeter (BS) wave functions\, which can be extracted by fitt
ing the correlation functions at different $r$ simultaneously. After disen
tangling from the conventional charmonium states in $0^{-+}$ \,$2^{-+}$ an
d $1^{--}$ channels，the spectrum and the BS wave functions of the hybrid
states in the four channels are obtained. It is found that the ground sta
te\, the first excited state and even the second excited states of these c
hannels are nearly degenerate in mass and have almost the same BS wave fun
ctions. Furthermore\, the BS wave functions of the ground state\, the firs
t excited state and the second excited state have zero radial node\, one r
adial node and two radial nodes\, respectively. In the non-relativistic pi
cture\, this observation implies that the hybrid states in these four chan
nels have similar infrastructure and the separation between the $c\\bar{c}
$ component and gluonic component (depicted by $B$ operator) can be taken
as a meaningful dynamical variable.\n\nhttps://indico.fnal.gov/event/15949
/contributions/34772/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34772/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions at physical quark masses in Lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34771@indico.fnal.gov
DESCRIPTION:Speakers: Takumi Doi (RIKEN)\nThe determination of baryon inte
ractions is of crucial importance to understand the origin of nuclei\, the
mechanism of supernovae and the gravitational waves emitted from the bina
ry neutron star mergers. In this talk\, we review the latest results for t
he first lattice QCD calculation of baryon interactions with (almost) phys
ical quark masses (m_pi=146 MeV) obtained by the time-dependent HAL QCD me
thod.\n\nhttps://indico.fnal.gov/event/15949/contributions/34771/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34771/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering in Euclidean formulations of relativistic quantum theor
y
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34770@indico.fnal.gov
DESCRIPTION:Speakers: Wayne Polyzou (University of Iowa)\nScattering theor
y can be formulated given a representation of the\nquantum mechanical Hilb
ert space and a set of self-adjoint Poincar\\'e\ngenerators satisfying clu
ster properties. These are both provided by\nthe Osterwalder-Schrader rec
onstruction theorem\, where the input is a\ncollection of Euclidean-covari
ant reflection-positive distributions.\nIn this representation both Hilber
t space inner products and matrix\nelements of the generators can be expre
ssed directly in terms of\nEuclidean variables\, without analytic continua
tion. A Euclidean\nversion of Haag-Ruelle scattering can be formulated in
this\nrepresentation\, which leads to expressions for scattering observab
les\nas strong limits. I discuss the construction of one-particle\nHaag-R
uelle states in this representation and show how these states\ncan be used
to construct wave operators. I exhibit toy model\ncalculations of sharp-
momentum transition matrix elements over a wide\nrange of energies that su
ggest the feasibility of formulating\nnumerical methods to compute scatter
ing observables in this\nEuclidean representation.\n\nhttps://indico.fnal.
gov/event/15949/contributions/34770/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34770/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of nucleon sigma terms II
DTSTART;VALUE=DATE-TIME:20180725T213000Z
DTEND;VALUE=DATE-TIME:20180725T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34769@indico.fnal.gov
DESCRIPTION:Speakers: Christian Hoelbling (Wuppertal University)\nWe prese
nt recent progress in the determination of nucleon sigma terms by the BMW
collaboration. In this talk physical results are presented.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34769/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34769/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spatial structure of the color field in the SU(3) flux tube
DTSTART;VALUE=DATE-TIME:20180723T213000Z
DTEND;VALUE=DATE-TIME:20180723T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34768@indico.fnal.gov
DESCRIPTION:Speakers: Volodymyr Chelnokov (Laboratori Nazionali di Frascat
i INFN)\nWe report on the chromoelectric and chromomagnetic fields generat
ed\nby a static quark-antiquark pair at zero temperature in pure gauge SU(
3).\nFrom the spatial structure of chromoelectric field we extract its non
perturbative\npart and discuss its properties.\n\nhttps://indico.fnal.gov/
event/15949/contributions/34768/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34768/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics at strong coupling on anisotropic lattices
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34767@indico.fnal.gov
DESCRIPTION:Speakers: Unger Wolfgang (Bielefeld University)\nLattice QCD a
t strong coupling has long been studied in a dual representation to circum
vent the finite baryon density sign problem. Recent results that establish
ed the non-perturbative functional dependence between the bare anisotropy
and the physical anisotropy a/a_t in the chiral limit are now extended to
finite quark mass. We discuss the consequences of the anisotropy callibrat
ion to the equation of state and the QCD phase diagram in the strong coupl
ing regime.\n\nhttps://indico.fnal.gov/event/15949/contributions/34767/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34767/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Indications for infrared conformal behaviour of SU(2) gauge theory
with N_f = 3/2 flavours of adjoint fermions
DTSTART;VALUE=DATE-TIME:20180724T190000Z
DTEND;VALUE=DATE-TIME:20180724T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34766@indico.fnal.gov
DESCRIPTION:Speakers: Philipp Scior (WWU Münster)\nWe present the results
of a numerical investigation of SU(2) gauge theory with $N_f = 3/2$ flavo
urs of fermions\, corresponding to 3 Majorana fermions\, which transform i
n the adjoint representation of the gauge group. At two values of the gaug
e coupling\, the masses of bound states are considered as a function of th
e PCAC quark mass. The scaling of bound states masses indicates an infrare
d conformal behaviour of the theory. We obtain estimates for the fixed-poi
nt value of the mass anomalous dimension $\\gamma^*$ from the scaling of m
asses and from the scaling of the mode number of the Wilson-Dirac operator
.\n\nhttps://indico.fnal.gov/event/15949/contributions/34766/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34766/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temporal Correlators in the Continuous Time Formulation of Strong
Coupling Lattice QCD
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34765@indico.fnal.gov
DESCRIPTION:Speakers: Marc Klegrewe (Bielefeld University)\nWe present res
ults for lattice QCD in the limit of infinite gauge coupling on a discrete
spatial but continuous Euclidean time lattice. A worm type Monte Carlo al
gorithm is applied in order to sample two-point functions which gives acc
ess to the measurement of mesonic temporal correlators. The continuous tim
e limit\, based on sending Nτ→∞ and the bare anistotropy to infinity
while fixing the temperature in a non-perturbative setup\, has various adv
antages: the algorithm is sign problem free\, fast\, and accumulates high
statistics for correlation functions. Even though the measurement of tempo
ral correlators requires the introduction of a binning in time direction\,
this discretization can be chosen to be by orders finer compared to discr
ete computations. For different spatial volumes and binnings\, temporal co
rrelators are measured at zero spatial momentum for a variety of mesonic o
perators. They are fitted to extract the pole masses and corresponding par
ticles as a function of the temperature. We conclude discussing the possib
ility to extract transport coefficients from these correlators.\n\nhttps:/
/indico.fnal.gov/event/15949/contributions/34765/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34765/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gaussian states for the variational study of (1+1)-dimensional lat
tice gauge models
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34764@indico.fnal.gov
DESCRIPTION:Speakers: Stefan Kuehn (Perimeter Institute for Theoretical Ph
ysics)\nGaussian states\, meaning states whose density matrix can be expre
ssed as a Gaussian function in the creation and annihilation operators\, a
re widely used in various areas to describe fermionic as well as bosonic s
ystems. However\, in cases where both bosons and fermions are present\, th
ey cannot describe any correlations between the two species beyond mean-fi
eld. This renders them at first glance unsuitable for the description of l
attice field theories with gauge and matter degrees of freedom.\n\nIn this
talk\, we show how to derive a set of unitary transformations for (1+1)-d
imensional gauge models which allow us to disentangle the relevant degrees
of freedom. The resulting formulation can be addressed with a Gaussian va
riational ansatz which makes it possible to numerically investigate static
and dynamical aspects of string breaking in Abelian and non-Abelian gauge
models. We show that the approach captures the relevant features and reli
ably describes the static properties as well as the out-of-equilibrium dyn
amics of the phenomenon. Benchmarking our results against those obtained f
rom Tensor Network simulations\, we observe excellent agreement although t
he number of variational parameters in the Gaussian ansatz is much smaller
.\n\nhttps://indico.fnal.gov/event/15949/contributions/34764/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34764/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a Dual Representation of Lattice QCD
DTSTART;VALUE=DATE-TIME:20180725T190000Z
DTEND;VALUE=DATE-TIME:20180725T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34763@indico.fnal.gov
DESCRIPTION:Speakers: Giuseppe Gagliardi (Bielefeld University)\nLattice Q
CD in a color singlet representation has been studied since decades in the
limit $\\beta\\to 0$. In this limiting case it is possible to integrate o
ut analytically the partition function at finite density which is then wri
tten in terms of dual\, integer\, degrees of freedom representing mesons a
nd baryons. The partition function can be then sampled by means of Worm al
gorithms. It turned out that within this dual representation the finite de
nsity sign problem is so mild such that the phase diagram could be establi
shed. The challenge at this point is to introduce dynamical gluons which w
ill allow us to study the system for larger beta values in order to make t
he lattice finer. Having in mind the systematic inclusion of higher order
correction to the strong coupling limit\, we will introduce a new represen
tation for the partition function of pure $(S)U(N_{c})$ Yang-Mills theory\
, which is more suitable for the extension of SC-LQCD to non-zero $\\beta$
. We will first show how to systematically compute the gauge integrals nee
ded to obtain such representation then possible sampling strategies of the
partition function will be discussed.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34763/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34763/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond Complex Langevin: a Progress Report
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34762@indico.fnal.gov
DESCRIPTION:Speakers: Jacek Wosiek (Jagiellonian University)\nFinding posi
tive representations of complex weights still attracts a fair amount of
interest. Extension of probabilistic Langevin dynamics into a complex doma
in works in some cases and fails in the others. For that reason some attem
pts were made to directly construct pairs of corresponding distributions\,
without invoking stochastic processes. One of such schemes\, and its new
theoretical and practical improvements\, will be discussed in this talk.\n
\nhttps://indico.fnal.gov/event/15949/contributions/34762/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34762/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD calculation of the nucleon hadronic tensor
DTSTART;VALUE=DATE-TIME:20180723T215000Z
DTEND;VALUE=DATE-TIME:20180723T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34761@indico.fnal.gov
DESCRIPTION:Speakers: Jian Liang (University of Kentucky)\nWe report preli
minary results on the lattice calculation of the hadronic tensor of the nu
cleon. Two topologically distinct connected-insertions of the Euclidean 4-
point function are considered which helps to separate the connected-sea pa
rton contribution from that of the valence. Converting the Euclidean hadro
nic tensor to that in the Minkowski space\, which involves an inverse prob
lem in a Laplace transform\, is implemented through the maximum entropy me
thod.\n\nhttps://indico.fnal.gov/event/15949/contributions/34761/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34761/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new method for suppressing excited-state contaminations on the n
ucleon form factors
DTSTART;VALUE=DATE-TIME:20180725T192000Z
DTEND;VALUE=DATE-TIME:20180725T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34760@indico.fnal.gov
DESCRIPTION:Speakers: Tobias Schulz (University of Mainz)\nOne of the most
challenging tasks in lattice calculations of hadronic form factors is the
analysis and control of excited-state contaminations. Taking the isovecto
r form factors of the nucleon as an example\, a simple calculation in chir
al effective field theory shows that the excited-state contributions becom
e dominant when the axial current is spatially distant from the nucleon so
urce location. In this case\, the distance of the propagating pions\, whic
h have been created at the source (or sink)\, is comparable to the distanc
e of the equal time pion propagation\, which corresponds to the ground sta
te contribution of the form factor including the pion pole. We investigate
a method on a $N_f=2+1$ flavor CLS ensemble ($\\beta=3.55$\, $a=0.064\\\,
$fm) with a pion mass of $m_\\pi=200\\\,$MeV using Wilson fermions to addr
ess this issue.\n\nhttps://indico.fnal.gov/event/15949/contributions/34760
/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34760/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isospin breaking corrections to the HVP at the physical point
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34759@indico.fnal.gov
DESCRIPTION:Speakers: Vera Guelpers (University of Southampton)\nA determi
nation of the HVP contribution to g-2 from lattice QCD aiming at a precisi
on of 1% requires to include isospin breaking corrections in the computati
on. We present a lattice calculation of the QED and strong isospin breakin
g corrections to the HVP with Domain Wall fermions. The results are obtain
ed using quark masses which are tuned such that pion and kaon masses agree
with their physical values including isospin breaking corrections.\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34759/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34759/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative generation of elementary fermion mass: a numerica
l study
DTSTART;VALUE=DATE-TIME:20180723T200000Z
DTEND;VALUE=DATE-TIME:20180723T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34758@indico.fnal.gov
DESCRIPTION:Speakers: Marco Garofalo (INFN\, unit of Rome Tor Vergata)\nIn
this talk we present a numerical lattice study of a SU(3) gauge model whe
re a SU(2) doublet of non-Abelian strongly interacting fermions is coupled
to a complex scalar field doublet via a Yukawa and a Wilson-like term. De
spite the presence of these two chiral breaking operators in the Lagrangia
n\, the model enjoys an exact symmetry\, acting on all fields\, which prev
ents UV power divergent fermion mass corrections. In the phase where the s
calar potential is non-degenerate and fermions are massless the bare Yukaw
a coupling can be set at a critical value at which chiral fermion transfor
mations become symmetries of the theory. Numerical simulations in the Namb
u-Goldstone phase of the critical theory\, for which the renormalized Yuka
wa coupling by construction vanishes\, give evidence for non-perturbative
generation of a UV finite fermion mass term in the low energy effective ac
tion.\n\nhttps://indico.fnal.gov/event/15949/contributions/34758/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34758/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice quantum gravity with scalar fields
DTSTART;VALUE=DATE-TIME:20180723T194000Z
DTEND;VALUE=DATE-TIME:20180723T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34757@indico.fnal.gov
DESCRIPTION:Speakers: Raghav Govind Jha (Syracuse University)\nWe consider
the lattice gravity model based on Euclidean dynamical triangulations inc
orporating degenerate tiling with a non-trivial measure term and couple it
minimally to a scalar field in the quenched approximation. Our preliminar
y results suggest a multiplicative renormalization for the mass of the sca
lar field which is consistent with the shift symmetry of the discretized l
attice action. We discuss the possibility of measuring mass anomalous dime
nsion and gravitational binding energy between two scalar test particles a
nd argue that negative energy of the bound state would imply that this mod
el can potentially represent gravitational attraction.\n\nhttps://indico.f
nal.gov/event/15949/contributions/34757/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34757/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matching the quasi parton distribution in a momentum subtraction s
cheme
DTSTART;VALUE=DATE-TIME:20180723T194000Z
DTEND;VALUE=DATE-TIME:20180723T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34756@indico.fnal.gov
DESCRIPTION:Speakers: Yong Zhao (Massachusetts Institute of Technology)\nT
he quasi parton distribution (quasi-PDF) is an equal-time correlation of q
uarks along the direction the nucleon is moving at. At large but finite nu
cleon momentum\, the quasi parton distribution can be perturbatively match
ed to the PDF through a factorization formula in large momentum effective
theory. Following a nonperturbative renormalization of the quasi parton di
stribution in a regularization independent momentum subtraction scheme\, w
e establish its matching to the MSbar PDF and calculate the non-singlet ma
tching coefficient at next-to-leading order in perturbation theory.\n\nhtt
ps://indico.fnal.gov/event/15949/contributions/34756/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34756/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards models with an unified dynamical mechanism for elementary
particle masses
DTSTART;VALUE=DATE-TIME:20180723T202000Z
DTEND;VALUE=DATE-TIME:20180723T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34755@indico.fnal.gov
DESCRIPTION:Speakers: Roberto Frezzotti (University of Rome "Tor Vergata"
and INFN unit of Rome Tor Vergata)\nNumerical evidence for a new dynamical
mechanism of elementary particle mass generation has been found by lattic
e simulation in a simplified SU(3) gauge model where a SU(2) doublet of st
rongly interacting fermions is coupled to a complex scalar field doublet v
ia a Yukawa and a Wilson-like term.\nWe point out that if\, as a next step
towards the construction of a realistic beyond-the-Standard-Model model\,
weak interactions are introduced\, then also weak bosons get a mass by th
e very same non-perturbative mechanism. In this scenario (fermion) mass hi
erarchy can be naturally understood owing to the peculiar gauge coupling d
ependence of the non-perturbatively generated masses. As a consequence\, i
f one wants to get the top-quark (or the weak bosons) mass at its phenomen
ological value\, the RGI scale of the theory must be much larger than $\\L
ambda_{QCD}$. This feature hints at the existence of new strong interactio
ns and particles at a scale $\\Lambda_T$ of a few TeV. In such a speculati
ve framework the electroweak scale can be derived from the fundamental sca
le $\\Lambda_T$ and the Higgs boson should arise a bound state in the WW+Z
Z channel.\n\nhttps://indico.fnal.gov/event/15949/contributions/34755/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34755/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards leading isospin breaking effects in mesonic masses with op
en boundaries
DTSTART;VALUE=DATE-TIME:20180724T213000Z
DTEND;VALUE=DATE-TIME:20180724T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34754@indico.fnal.gov
DESCRIPTION:Speakers: Andreas Risch (Institute for Nuclear Physics\, Unive
rsity of Mainz)\nWe present an exploratory study of leading isospin breaki
ng effects in mesonic masses using $O(a)$ improved Wilson fermions with op
en boundaries. Isospin symmetry is explicitly broken by distinct masses an
d electric charges of the up and down quarks. In order to be able to make
use of existing isosymmetric QCD gauge ensembles we apply reweighting tech
niques. The path integral describing QCD+QED is expanded perturbatively in
powers of deviations in the quark masses and the inverse strong coupling
as well as the electromagnetic coupling. We have formulated QED$_\\mathrm{
L}$\, which we use as a finite volume formulation of QED\, for open bounda
ries. We will also give a first insight into contributions from quark disc
onnected diagrams.\n\nhttps://indico.fnal.gov/event/15949/contributions/34
754/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34754/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher order fluctuations form imaginary chemical potential
DTSTART;VALUE=DATE-TIME:20180725T213000Z
DTEND;VALUE=DATE-TIME:20180725T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34753@indico.fnal.gov
DESCRIPTION:Speakers: Jana N. Guenther (University of Regensburg)\nWhen co
mparing lattice calculation to experimental data from heavy ion collision
experiments\, the higher order fluctuations of conserved charges are impor
tant observables. An efficient way to study these fluctuations is to deriv
e them from simulations at a set of imaginary chemical potentials. In this
talk we present results for higher order derivatives with respect to $\\m
u_B$\, $\\mu_S$ and $\\mu_Q$ determined at the physical point from simulat
ions with staggered fermions using different imaginary values of $\\mu_B$.
We then can determine several combinations that allow for a comparison to
heavy ion collision experiments\, and extrapolate theses observables to r
eal baryon chemical potential.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34753/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34753/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Implementation of the conjugate gradient algorithm in Lattice QCD
on FPGA devices
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34752@indico.fnal.gov
DESCRIPTION:Speakers: Piotr Korcyl (Jagiellonian University and University
of Regensburg)\nWe port the most critical part of the Lattice Quantum Chr
omodynamics code\, the iterative solver\, to modern\nFPGA devices. More pr
ecisely\, we discuss a single-node\, double precision implementation\nof t
he Conjugate Gradient algorithm and use it to invert numerically the Dirac
-Wilson operator on a\n4-dimensional grid on a Xilinx Zynq evaluation boar
d. We propose a separation of software/hardware\nparts in which the entire
multiplication by the Dirac operator is performed in hardware\, and the r
est of the\nalgorithm runs on an ARM core. We find out that the FPGA imple
mentation offers a performance\ncomparable with that obtained modern\, gen
eral purpose x86 Intel processors. Several directions\nof further research
will be suggested.\n\nhttps://indico.fnal.gov/event/15949/contributions/3
4752/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34752/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An AVX512 Extention to OpenQCD
DTSTART;VALUE=DATE-TIME:20180725T215000Z
DTEND;VALUE=DATE-TIME:20180725T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34751@indico.fnal.gov
DESCRIPTION:Speakers: Jarno Rantaharju (Swansea Academy of Advanced Comput
ing)\nWe publish an extension of openQCD-1.6 with AVX512 vector instructio
ns using Intel intrinsics. Recent Intel processors support extended instru
ction sets with operations on 512-bit wide vectors\, increasing both the c
apacity for simultaneous floating point operations and of register memory.
Optimal use of the new capabilities requires a reorganisation of data and
floating point operations into these wider vector units. We report on the
implementation and performance of the AVX512 OpenQCD extension on cluster
s using Intel Knights Landing and Xeon Scalable (Skylake) CPUs. In complet
e HMC trajectories with physically relevant parameters we observe a perfor
mance increase of 5% to 10%.\n\nhttps://indico.fnal.gov/event/15949/contri
butions/34751/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34751/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the spectrum of flavour-diagonal pseudoscalar mesons in QC
D+QED
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34750@indico.fnal.gov
DESCRIPTION:Speakers: Ross Young (University of Adelaide)\nThe low-lying h
adron spectrum has been of tremendous phenomenological significance in res
olving the nature of quark masses in strong interaction dynamics. In parti
cular\, the pseudoscalar mesons provide the foundation of the framework of
chiral perturbation theory\, the low-energy effective theory of QCD. Mode
rn lattice calculations of pure QCD now provide excellent precision in the
resolution of quark masses. In order to match this theory onto the observ
ed mass scales of the standard model at sub-percent precision\, it is esse
ntial to discriminate electromagnetic effects. In this work\, we explore t
he spectrum of the flavour-diagonal pseudoscalar mesons on dynamical QCD+Q
ED lattices. To reduce the familiar statistical noise associated with anni
hilation diagrams we utilise exact colour and spin dilution with a spatial
interlacing for our $Z_2$ noise sources. In comparison with results from
pure QCD\, we make first estimates of the contribution of electromagnetic
effects in the $\\pi_0$–$\\eta$ splitting.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34750/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34750/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roper State from Overlap Fermion
DTSTART;VALUE=DATE-TIME:20180726T170000Z
DTEND;VALUE=DATE-TIME:20180726T172000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34749@indico.fnal.gov
DESCRIPTION:Speakers: Keh-Fei Liu (University of Kentucky)\nVariational me
thod with valence overlap fermion is employed to calculate the Roper state
on the $24^3 \\times 64$ domain-wall fermion lattice at a = 0.114 and 330
MeV pion mass. It is found that the results are consistent with those fro
m the sequential empirical Bayes (SEB) method. They are about 300 MeV lowe
r than those with the clover fermion at comparable lattice spacing and pio
n mass. To understand the difference\, we study the \nwould-be $\\eta-\\pi
$ ghost state in the isovector scalar channel with the $\\bar{q}q$ interpo
lation field in the quenched approximation for both the overlap and Wilson
fermions to compare their couplings to the two hadron state with the sing
le hadron interpolation field.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34749/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34749/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigations of N = 1 supersymmetric SU(3) Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34748@indico.fnal.gov
DESCRIPTION:Speakers: Henning Gerber (WWU Münster)\nWe summarise the curr
ent status of our numerical simulations of N = 1\nsupersymmetric Yang-Mill
s theory with gauge group SU(3). We use the\nformulation of Curci and Vene
ziano with clover-improved Wilson fermions.\nThe masses of various bound s
tates have been obtained at different\nvalues of the gluino mass and gauge
coupling. Extrapolations to the\nlimit of vanishing gluino mass indicate
that the bound states form\nmass-degenerate supermultiplets.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34748/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34748/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge-fixing with compact lattice gauge fields
DTSTART;VALUE=DATE-TIME:20180724T200000Z
DTEND;VALUE=DATE-TIME:20180724T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34747@indico.fnal.gov
DESCRIPTION:Speakers: Asit Kumar De (Professor)\nProper treatment of redun
dant gauge degrees of freedom seems necessary for gauge theories with term
s that explicitly break gauge symmetry (e.g.\, in chiral gauge theories wi
th manifestly local formulation of lattice fermions) since these degrees o
f freedom become manifestly present in such theories. There is also a no-g
o theorem prohibiting use of BRST formalism in theories with compact gauge
fields. Results will be presented of our investigation of pure U(1) gauge
theory\, with higher derivative gauge-fixing term that breaks BRST\, at s
trong gauge coupling that show that the redundant gauge degrees of freedom
decouple just as seen previously in the weak coupling region. The general
scheme of numerical simulation of an SU(2) gauge theory in the equivarian
t BRST (eBRST) formalism with dynamical ghost fields in the SU(2)/U(1) cos
et space will also be presented. Details of the results of the eBRST SU(2)
lattice gauge theory and the theory in the reduced limit (obtained by gau
ge coupling taken to zero) will be covered by Mugdha Sarkar.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34747/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34747/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculating the $\\rho$ radiative decay width with lattice QCD
DTSTART;VALUE=DATE-TIME:20180725T202000Z
DTEND;VALUE=DATE-TIME:20180725T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34746@indico.fnal.gov
DESCRIPTION:Speakers: Luka Leskovec (University of Arizona)\nWe present th
e results of our lattice QCD study of the $\\pi\\gamma\\to\\pi\\pi$ proces
s\, where the $\\rho$ resonance appears as an enhancement in the transitio
n amplitude. We use Nf=2+1 clover fermions on a lattice of L=3.6 fm and a
pion mass of 320 MeV. Using a combination of forward\, stochastic and seq
uential propagators we calculate the two-point and three-point functions r
equired in the determination of the $\\pi\\gamma\\to\\pi\\pi$ amplitude an
d determine the $\\pi\\gamma\\to\\pi\\pi$ matrix elements in a region of i
nvariant mass s and momentum transfer $q^2$. To fit the $q^2$ and s depend
ence of the amplitude we are exploring a set of general models based on a
Taylor expansion and their description of the data. By analytic continuati
on to the complex pole corresponding to the $\\rho$ resonance we determine
the resonant form factors and calculate the radiative decay width of the
$\\rho$ resonance.\n\nhttps://indico.fnal.gov/event/15949/contributions/34
746/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34746/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine learning inspired analysis of the Ising model transition
DTSTART;VALUE=DATE-TIME:20180727T204000Z
DTEND;VALUE=DATE-TIME:20180727T210000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34745@indico.fnal.gov
DESCRIPTION:Speakers: Samuel Foreman (University of Iowa)\nWe illustrate h
ow principal component analysis of simulation data represented as images g
enerated from the worm algorithm\, a method to sample the strong coupling
contributions\, can be used to identify the critical temperature Tc in the
Ising model. It is shown that the eigenvalue corresponding to the first p
rincipal component of the covariance matrix obtained from pixel ensembles
scales logarithmically as one approaches Tc\, in a way that is similar to
the specific heat. We then illustrate how to block the resulting worm conf
igurations under renormalization group transformations. It is found that c
urves for the variance of the average number of bonds can be scaled approp
riately to illustrate universal behavior under the renormalization group t
ransformation\, and that discrepancies can be understood as an effect of a
pproximations.\n\nhttps://indico.fnal.gov/event/15949/contributions/34745/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34745/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Communication-avoiding optimization methods for fermion matrix inv
erters
DTSTART;VALUE=DATE-TIME:20180723T213000Z
DTEND;VALUE=DATE-TIME:20180723T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34744@indico.fnal.gov
DESCRIPTION:Speakers: Alexei Strelchenko (FNAL)\nThe global all-to-all com
munications in the Krylov subspace iterative methods is \none of the major
performance-limiting factors on large-scale parallel machines.\nIn this r
eport we give a brief overview of recent algorithmic approaches \nto mitig
ate communication cost in the iterative solvers. We present several varian
ts\nof communication-optimized fermion matrix inverters implemented in the
QUDA library. \nFinally\, we will discuss a few possible scenarios of uti
lizing exascale-ready algorithms \nfrom the Trilinos framework for LQCD ap
plications.\n\nhttps://indico.fnal.gov/event/15949/contributions/34744/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34744/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulations of gaussian systems in Minkowski time
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34743@indico.fnal.gov
DESCRIPTION:Speakers: Blazej Ruba (Jagiellonian University)\nMany research
programs aiming to deal with the sign problem were proposed since the adv
ent of lattice field theory. Several of these try to achieve this by explo
iting properties of analytic functions. This is also the case for one of t
he approaches we're developing. There auxillary complex variables are intr
oduced and desired weight is obtained after integrating them out. In this
talk I will elucidate difficulties previously present in this method. Appl
ications to gaussian path integrals directly in Minkowski time shall be re
viewed.\n\nhttps://indico.fnal.gov/event/15949/contributions/34743/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34743/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor Networks and their use for Lattice Gauge Theories
DTSTART;VALUE=DATE-TIME:20180728T151500Z
DTEND;VALUE=DATE-TIME:20180728T154500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34742@indico.fnal.gov
DESCRIPTION:Speakers: Mari Carmen Banuls (Max Planck Institute of Quantum
Optics)\nThe term Tensor Network States (TNS) has become a common one in t
he context of numerical studies of quantum many-body problems. It refers t
o a number of families that represent different ansatzes for the efficient
description of the state of a quantum many-body system. The first of thes
e families\, Matrix Product States (MPS)\, lies at the basis of Density Ma
trix Renormalization Group methods\, which have become the most precise to
ol for the study of one dimensional quantum many-body systems. Their natur
al generalization to two or higher dimensions\, the Projected Entanglement
Pair States (PEPS) are good candidates to describe the physics of higher
dimensional lattices. Another TNS ansatz\, the MERA\, has recently been co
nnected to a discrete realization of the AdS/CFT correspondence. \n\nTNS c
an be used to study equilibrium properties\, as ground and and thermal sta
tes\, but also dynamics. Quantum information gives us some tools to unders
tand why these families are expected to be good ansatzes for the physicall
y relevant states\, and some of the limitations connected to the simulatio
n algorithms.\n\nLattice Gauge Theories\, in their Hamiltonian version\, o
ffer a challenging scenario for these techniques. While the dimensions and
sizes of the systems amenable to TNS studies are still far from those ach
ievable by Monte Carlo simulations\, Tensor Networks can be readily used f
or problems which more standard techniques cannot easily tackle\, such as
the presence of a chemical potential\, or out-of-equilibrium dynamics.\n\n
The last years have seen an increasing interest in this particular applica
tion of Tensor Network methods. In this talk I will present some of the re
cent work in this area. In particular\, using the Schwinger model as a tes
tbench\, we have shown that Matrix Product States (MPS) are suitable to ap
proximate low energy states precisely enough to allow for accurate finite
size and continuum limit extrapolations of ground state properties\, mass
gaps and temperature dependent quantities. The feasibility of the method h
as already been tested also for non-Abelian models\, out-of-equilibrium sc
enarios\, and non-vanishing chemical potential.\n\nhttps://indico.fnal.gov
/event/15949/contributions/34742/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34742/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED corrections to Pion and Kaon decay constants
DTSTART;VALUE=DATE-TIME:20180725T200000Z
DTEND;VALUE=DATE-TIME:20180725T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34741@indico.fnal.gov
DESCRIPTION:Speakers: James Richings (University of Southampton)\nPredicti
ons for pion and kaon leptonic decay constants in Lattice QCD have reached
sub-percent level precision. Since it is expected that isospin breaking c
orrections become important at this level of precision\, further progress
on the lattice requires inclusion of these effects. Given the phenomenolog
ical relevance for instance in CKM analyses this seems a worthwhile endeav
our. In this talk I present RBC/UKQCD's efforts towards the computation of
isospin breaking effects to leptonic decays of light mesons using a pertu
rbative expansion in a stochastic\, gaussian EM potential. We are currentl
y focusing our efforts to design an efficient measurement strategy using M
obius domain wall fermions at physical quark masses. Our work is based on
all-to-all propagators using low mode averaging. It is implemented in Hadr
ons\, a new workflow management system based on the Grid Library.\n\nhttps
://indico.fnal.gov/event/15949/contributions/34741/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34741/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multigrid for Wilson Clover Fermions in Grid
DTSTART;VALUE=DATE-TIME:20180723T215000Z
DTEND;VALUE=DATE-TIME:20180723T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34740@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Richtmann (University of Regensburg)\nWith th
e ever-growing number of computing architectures\, performance portability
is an important aspect of (Lattice QCD) software.\nThe Grid library provi
des a good framework for writing such code\, as it thoroughly separates ha
rdware-specific code from algorithmic functionality and already supports m
any modern architectures.\nThe Regensburg group (RQCD) decided to deprecat
e its Xeon Phi version of the DD-$\\alpha$AMG multigrid solver and impleme
nt this algorithm in Grid.\nWe describe our implementation\, review the co
ding efforts\, and summarize our experiences with the Grid library.\nWe pr
esent the solver's features and compare its performance with other multigr
id implementations.\n\nhttps://indico.fnal.gov/event/15949/contributions/3
4740/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34740/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD and Nuclear Physics for BSM searches
DTSTART;VALUE=DATE-TIME:20180723T150000Z
DTEND;VALUE=DATE-TIME:20180723T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34739@indico.fnal.gov
DESCRIPTION:Speakers: Emanuele Mereghetti (Los Alamos National Laboratory)
\nLow-energy tests of fundamental symmetries are extremely sensitive probe
s of physics beyond the Standard Model (SM)\, reaching scales that are com
parable\, if not higher\, than directly accessible at the energy frontier.
The interpretation of low-energy precision experiments and their connecti
on with models of BSM physics relies on controlling the theoretical uncert
ainties induced by the non-perturbative nature of QCD at low energy and of
the nuclear interactions.\n\nIn this talk I will discuss how the interpla
y of Lattice QCD and nuclear Effective Field Theories\ncan lead to improve
d predictions for low-energy experiments\, with controlled uncertainties.
\nI will review recent progress in the calculation of the nucleon electric
dipole moment (EDM) and of time-reversal-violating pion-nucleon couplings
\, and the implications for nuclear EDM experiments. \nI will then discuss
open problems in the theory of neutrinoless double beta decay\, and the i
mportant role that lattice QCD calculations in the two-nucleon sector can
play to resolve these issues.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34739/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34739/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutron-antineutron oscillations from Lattice QCD at the physical
point
DTSTART;VALUE=DATE-TIME:20180723T190000Z
DTEND;VALUE=DATE-TIME:20180723T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34738@indico.fnal.gov
DESCRIPTION:Speakers: Enrico Rinaldi (RIKEN BNL Research Center)\nFundamen
tal symmetry tests of baryon number violation in low-energy experiments ca
n test beyond the Standard Model explanations of the matter-antimatter asy
mmetry of the universe.\nNeutron-antineutron oscillations are predicted to
be a signature of many baryogenesis mechanisms involving low-scale baryon
number violation.\nThis work presents the first complete lattice quantum
chromodynamics calculation of the six-quark matrix elements needed to conn
ect experimental measurements of the neutron-antineutron oscillation time
to constraints on beyond the Standard Model theories. Physical pion masses
are used and non-perturbative renormalization is included.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34738/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34738/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing the composite light scalar of the sextet model for dilaton
fingerprints
DTSTART;VALUE=DATE-TIME:20180725T192000Z
DTEND;VALUE=DATE-TIME:20180725T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34737@indico.fnal.gov
DESCRIPTION:Speakers: Chik Him Wong (University of Wuppertal)\nThe light 0
++ scalar can be probed for dilaton signatures in near-conformal gauge the
ories. A case study is presented for the analysis of the SU(3) gauge theor
y with two fermions in the two-index symmetric representation (sextet mode
l). It is shown that statistical methods which are based on Bayesian Mark
ov Chain Monte Carlo analysis are important for robust tests of dilaton fi
ngerprints in lattice gauge configurations.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34737/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34737/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon form factors from Nf=2+1+1 twisted mass fermions at the ph
ysical point
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34736@indico.fnal.gov
DESCRIPTION:Speakers: Martha Constantinou (Temple University)\nWe present
results on the nucleon form factors including disconnected contributions u
sing an ensemble of Nf=2+1+1 twisted mass fermions with a clover term. The
ensemble has a spatial extent of 5.12fm (64^3 x128). Techniques such as t
he summation and the two-state fits have been employed to control possible
excited states contamination.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34736/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34736/
END:VEVENT
BEGIN:VEVENT
SUMMARY:3-body quantization condition in unitary isobar formalism
DTSTART;VALUE=DATE-TIME:20180723T213000Z
DTEND;VALUE=DATE-TIME:20180723T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34735@indico.fnal.gov
DESCRIPTION:Speakers: Maxim Mai (The George Washington University)\nIn the
isobar parametrization the three-particle states are populated via an int
eracting two-particle system (resonant or non-resonant)\, and a spectator.
Using this formulation\, we derive the isobar-spectator amplitude such th
at the three-body Unitarity is ensured exactly (arXiv:1706.06118).\n\nUnit
arity constrains the imaginary parts of such an amplitude\, which determin
e the power-law finite-volume effects to ensure the correct 3-body quantiz
ation condition. The derivation of the latter in the present formalism (ar
Xiv:1709.08222) as well as its subsequent application for the determinatio
n of the finite-volume energy spectrum in realistic systems will be presen
ted in this talk.\n\nhttps://indico.fnal.gov/event/15949/contributions/347
35/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34735/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluonic structure of spin-1 meson as it becomes unstable using var
iationally optimized operators
DTSTART;VALUE=DATE-TIME:20180723T211000Z
DTEND;VALUE=DATE-TIME:20180723T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34734@indico.fnal.gov
DESCRIPTION:Speakers: Dimitra Pefkou (Student at William and Mary)\nWe pre
sent a first calculation of the first moments of gluon GPDs for a vector r
ho meson as it becomes unstable. We construct three-point functions in the
forward limit using ‘optimized’ operators that interpolate a single s
tate as well as a gluonic operator insertion. The two-point correlation fu
nctions have been constructed using the ‘distillation’ method. The cor
relators are calculated in anisotropic lattices and the two spin-independe
nt and one transversity gluon distributions are extracted. We compare the
distributions and the resulting gluon momentum fractions between stable an
d unstable meson states. We discuss finite volume effects and outline how
to apply our methods to probe the gluonic structure of hybrid and exotic s
tates.\n\nhttps://indico.fnal.gov/event/15949/contributions/34734/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34734/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A tensorial toolkit for quantum computing
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34733@indico.fnal.gov
DESCRIPTION:Speakers: Yannick Meurice (U. of Iowa)\nIn most lattice simula
tions\, the variables of integration are compact and character expansion (
for instance Fourier analysis for $U(1)$ models) can be used \nto rewrite
the partition function and average observables as discrete sums of contrac
ted tensors. This reformulations have been used for RG blocking but they a
re also suitable for quantum computing. We discuss FAQ about tensorial ref
ormulations:\nboundary conditions\, Grassmann variables\, Ward identities
and manifest gauge invariance.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34733/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34733/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Test of factorization for the long-distance effects from charmoni
um in $B\\rightarrow Kll$
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34732@indico.fnal.gov
DESCRIPTION:Speakers: Katsumasa Nakayama (Department of Physics\, Nagoya U
niv.)\nWe report on a calculation of the charmonium contribution to the de
cay $B \\rightarrow Kll$ using lattice simulations with 2+1 flavors of Mo
bius domain wall fermions.\nWe focus on the region of $q^2$ below the $J/\
\psi$ resonance and test the factorization approximation to estimate the a
mplitude.\n\nhttps://indico.fnal.gov/event/15949/contributions/34732/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34732/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetric mass generation in a gauged system
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34731@indico.fnal.gov
DESCRIPTION:Speakers: Nouman Butt (Syracuse University)\nWe study a model
of four reduced staggered fermions transforming in the bifundamental repre
sentation of an SU(2)xSU(2) symmetry group.\nSingle site mass terms are pr
ohibited by this symmetry but a particular four fermi term is allowed. We
gauge one of the SU(2) subgroups and examine\nthe phase structure of the m
odel. We find evidence that the theory forms a symmetric four fermion cond
ensate at strong coupling. The model generalizes\na SO(4) invariant four f
ermion model that has received recent attention.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34731/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34731/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher moments of parton distribution functions
DTSTART;VALUE=DATE-TIME:20180725T192000Z
DTEND;VALUE=DATE-TIME:20180725T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34730@indico.fnal.gov
DESCRIPTION:Speakers: Zohreh Davoudi (University of Maryland)\nHigher mome
nts of patron distribution functions (PDFs) have evaded lattice QCD calcul
ations due to the well-known problem of power-divergent mixing with low-di
mension operators towards the continuum limit. With a new proposal for sme
ared and angular-momentum projected operators presented in Phys. Rev. D 86
\, 054505 (2012)\, we obtain moments of several PDFs of the pion\, includi
ng the high moments previously inaccessible to LQCD calculations\, through
a dedicated numerical study using a sequence of coarse to ultrafine quenc
hed QCD ensembles generated with the proposal of Phys. Rev. D 92\, 114516
(2015). Our preliminary results demonstrate the feasibility of extracting
higher moments of PDFs of hadrons in future LQCD studies\, complementing e
xisting proposals for direct evaluations of quasi-PDFs.\n\nhttps://indico.
fnal.gov/event/15949/contributions/34730/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34730/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton Distribution Function Calculation of the Pion on a Fine Lat
tice
DTSTART;VALUE=DATE-TIME:20180724T215000Z
DTEND;VALUE=DATE-TIME:20180724T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34729@indico.fnal.gov
DESCRIPTION:Speakers: Charles Shugert (Stony Brook University and Brookhav
en National Lab)\nWe present numerical results on the bare quasi-PDF matri
c element for the pion. Our
\n pion mass is $300$ MeV usi
ng a HISQ sea and Wilson-Clover valence quarks. Our
\n lattice spacing and volume are $0.061$ fm and $48^{3} \\times 64$ resp
ectivly. Large
\n momentum calculations being necessary f
or reliable matching between the quasi-PDF
\n and the l
ight-cone PDF using LaMET\, we evaluate our matrix elements for a pion
\n with momentum $1.69(2.11)$ GeV\, or $4(5)$ units on
the lattice. Large momentum
\n calculations on the l
attice are notoriously contaminated with unwanted excited
\n state contributions overlapping to our measurement. As such we al
so present a
\n detailed study of pion two-point fu
nctions at large momentum\, tuned using a
\n mult
itude of smearing techniques to reduce the overlap of our operators to exc
ited
\n states. Furthermore we HYP-smear the Wilson Line
of our quasi-PDF matrix element to
\n study the reductio
n of lattice artifacts in our calculation. Ioffe-Time distribution
\n functions were also computed as an exploratory study.\n\nhttps
://indico.fnal.gov/event/15949/contributions/34729/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34729/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the convergence of SU(2) HBChiPT
DTSTART;VALUE=DATE-TIME:20180725T213000Z
DTEND;VALUE=DATE-TIME:20180725T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34728@indico.fnal.gov
DESCRIPTION:Speakers: Karl Sallmen (KTH)\nBy performing a simultaneous ext
rapolation of $g_A$ and $m_N$\, determined from recent lattice QCD calcula
tions using the MDWF on gradient flowed HISQ action. We explore the conver
gence of SU(2) HBChiPT using expressions for $g_A$ and $m_N$ derived to a
relatively high order.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34728/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34728/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Calculation of Parton Distribution Function from LaMET
DTSTART;VALUE=DATE-TIME:20180723T202000Z
DTEND;VALUE=DATE-TIME:20180723T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34727@indico.fnal.gov
DESCRIPTION:Speakers: Yu-Sheng Liu (Tsung-Dao Lee Institute)\nWe present a
lattice-QCD calculation of the isovector parton distribution function (PD
F) within the framework of large-momentum effective theory (LaMET). We det
ail the systematics that affect PDF calculations\, providing guidelines to
improve the precision of future lattice PDF calculations. We find our fin
al parton distribution to be in reasonable agreement with the PDF provided
by the latest phenomenological analysis.\n\nhttps://indico.fnal.gov/event
/15949/contributions/34727/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34727/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The $K_{\\ell 3}$ form factor from four-flavor lattice QCD and $|V
_{us}|$
DTSTART;VALUE=DATE-TIME:20180725T190000Z
DTEND;VALUE=DATE-TIME:20180725T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34726@indico.fnal.gov
DESCRIPTION:Speakers: Aida El-Khadra (University of Illinois at Urbana-Cha
mpaign)\nUsing HISQ $N_f=2+1+1$ MILC ensembles at five different lattice s
pacings\, including four ensembles with physical quark masses\, we perform
the most precise computation to date of the $K\\to\\pi\\ell\\nu$ vector f
orm factor at zero momentum transfer. This is the first calculation that i
ncludes the dominant finite-volume effects\, as calculated in chiral pertu
rbation theory at next-to-leading order. Our result for the form factor pr
ovides a direct determination of the Cabibbo-Kobayashi-Maskawa matrix elem
ent $|V_{us}|$\, when combined with the corresponding experimental average
. For the first time\, the resulting theory error on $|V_{us}|$ is commen
surate with the experimental uncertainty. We find that this determination
of $|V_{us}|$ is in tension at the $2-2.6\\sigma$ level both with determin
ations from leptonic decays and with the unitarity of the CKM matrix.\n\nh
ttps://indico.fnal.gov/event/15949/contributions/34726/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34726/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD spectroscopy for hadronic CP violation
DTSTART;VALUE=DATE-TIME:20180725T211000Z
DTEND;VALUE=DATE-TIME:20180725T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34725@indico.fnal.gov
DESCRIPTION:Speakers: Andre Walker-Loud (LBNL)\nThe observed abundance of
matter over anti-matter in the universe suggests the need for beyond the S
tandard Model sources of CP-violation. This has motivated a significant e
xperimental effort to search for among other things\, permanent electric d
ipole moments (EDMs) in nucleons\, light and also extremely heavy nuclei.
The interpretation of nuclear EDMs is clouded by large theoretical uncert
ainties associated with nonperturbative matrix elements. For certain nucl
ei\, and certain classes of BSM theories\, nuclear EDMs are expected to be
dominated by contributions from long range\, CP-violating pion-nucleon in
teractions. We discuss a strategy to determine these CP-violating couplin
gs through the calculation of CP-conserving nucleon matrix elements\, whic
h are determined through a modification of the spectrum via the Feynman-He
llmann method of Bouchard et al. [arXiv:1612.06963]. We show preliminary
results of LQCD calculations of these couplings.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34725/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34725/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaon mixing beyond the standard model with physical masses.
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34724@indico.fnal.gov
DESCRIPTION:Speakers: Julia Kettle (University of Edinburgh)\nI present an
update on the calculation of beyond the standard model kaon mixing matrix
elements in isospin symmetric pure QCD with $n_f$ = 2 + 1 dynamical flavo
urs calculated with data at the physical pion mass. Our analysis includes
simulations with domain wall fermions and an Iwasaki gauge\, at three-latt
ice spacings and a range of pion masses from the physical point up to 430
MeV.\nWe perform a simultaneous chiral and continuum fit to extrapolate to
the physical point continuum limit. This builds upon our earlier work\,
by adding the third lattice spacing and ensembles calculated directly at t
he physical light quark mass\, improving the precision of the mass extrapo
lation and removal of discretisation effects.\n\nhttps://indico.fnal.gov/e
vent/15949/contributions/34724/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34724/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Direct lattice-QCD calculation of pion valence quark distribution
DTSTART;VALUE=DATE-TIME:20180724T211000Z
DTEND;VALUE=DATE-TIME:20180724T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34723@indico.fnal.gov
DESCRIPTION:Speakers: Jianhui Zhang (University of Regensburg)\nWithin the
large momentum effective theory framework\, we present the first direct l
attice-QCD calculation of the valence quark distribution in the pion. Our
results are comparable quantitatively with the results extracted from expe
rimental data as well as from Dyson-Schwinger equation. Future calculation
s at physical pion mass and larger\nmomentum will be able to discern discr
epancies in various existing analyses.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34723/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34723/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Contribution to the anomalous magnetic moment of the muon from the
disconnected hadronic vacuum polarization with four-flavors of highly-imp
roved staggered quarks.
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34722@indico.fnal.gov
DESCRIPTION:Speakers: Shuhei Yamamoto (The University of Utah)\nWe describ
e a computation of the contribution to the anomalous magnetic moment of th
e muon from the disconnected part of the hadronic vacuum polarization. We
use the highly-improved staggered quark (HISQ) formulation for the curren
t density with gauge configurations generated with four flavors of HISQ se
a quarks. The computation is performed by stochastic estimation of the cur
rent density using the truncated solver method combined with deflation of
low-modes. The parameters are tuned to minimize the computational cost fo
r a given target uncertainty in the current-current correlation function.
The calculation presented here is carried out on a single gauge-field ens
emble of size $32^3 \\times 48$ with an approximate lattice spacing of 0.1
5 fm and with physical sea-quark masses. We describe the methodology and
the analysis procedure.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34722/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34722/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stabilising complex Langevin simulations
DTSTART;VALUE=DATE-TIME:20180723T194000Z
DTEND;VALUE=DATE-TIME:20180723T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34721@indico.fnal.gov
DESCRIPTION:Speakers: Felipe Attanasio (University of Washington)\nWe pres
ent results of our technique of dynamic stabilisation (DS) applied to comp
lex Langevin simulations of QCD in the heavy-dense limit and with staggere
d quarks. We show that DS is able to keep simulations stable\, providing r
esults compatible with Monte-Carlo simulations\, where the latter is appli
cable.\n\nhttps://indico.fnal.gov/event/15949/contributions/34721/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34721/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering length from BS wave function inside the interaction ran
ge
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34720@indico.fnal.gov
DESCRIPTION:Speakers: Yusuke Namekawa (University of Tsukuba)\nWe evaluate
scattering lengths by use of a scattering amplitude\ncalculated with the
Bethe-Salpeter wave function\ninside the interaction range.\nScattering le
ngths of I=2 two pions are computed\nby both conventional and our methods\
nwith $m_\\pi = 0.52-0.86$ GeV in the quenched lattice QCD.\nThe results a
re compared with each other to confirm consistency.\nFurthermore\, a half
off-shell amplitude is calculated.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34720/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34720/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HVP contribution of the light quarks to the muon (g - 2) including
QED corrections with Twisted-Mass fermions
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34719@indico.fnal.gov
DESCRIPTION:Speakers: Davide Giusti (Università degli Studi Roma Tre and
INFN - Sezione di Roma Tre)\nWe present a preliminary lattice calculation
of the Hadronic Vacuum Polarization (HVP) contribution of the light quarks
to the anomalous magnetic moment of the muon including leading-order stro
ng and electromagnetic isospin-breaking corrections. Our lattice results a
re obtained in an electro-quenched setup using the gauge configurations ge
nerated by the European Twisted Mass Collaboration (ETMC) with $N_f=2+1+1$
dynamical quarks at three lattice spacings varying from 0.089 to 0.062 fm
with pion masses in the range $M_\\pi \\simeq 220 - 490~\\mbox{MeV}$. Sev
eral lattice volumes are considered in order to investigate the impact of
finite-volume effects. Systematic uncertainties due to the extrapolations
to the physical pion mass and to the infinite-volume and continuum limit a
re estimated.\n\nhttps://indico.fnal.gov/event/15949/contributions/34719/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34719/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD crossover at zero and non-zero baryon densities
DTSTART;VALUE=DATE-TIME:20180725T211000Z
DTEND;VALUE=DATE-TIME:20180725T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34718@indico.fnal.gov
DESCRIPTION:Speakers: Patrick Steinbrecher (Brookhaven National Lab)\nWe w
ill present new state-of-the-art lattice QCD results on the chiral crossov
er temperature of QCD for moderately large baryon chemical potential. Firs
tly\, we will present a more precise updated result for the QCD pseudo-cri
tical temperature at zero baryon chemical potential\, obtained from all po
ssible second-order chiral susceptibilities that diverge in the chiral lim
it. Then we will present new results on the QCD pseudo-critical temperatur
e at non-zero baryon chemical potential\, computed using Taylor-expansions
of chiral condensate and chiral susceptibilities up to 6th-order in the c
hemical potential. Finally\, we will present various second-order fluctuat
ions along the QCD crossover line to look for possible signs of increased
fluctuations with increasing baryon density.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34718/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34718/
END:VEVENT
BEGIN:VEVENT
SUMMARY:U(1) vacuum\, Chern-Simons diffusion and real-time simulations
DTSTART;VALUE=DATE-TIME:20180723T200000Z
DTEND;VALUE=DATE-TIME:20180723T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34717@indico.fnal.gov
DESCRIPTION:Speakers: Adrien Florio (EPFL)\nNon-abelian gauge theories hav
e a complex vacuum structure which has well-known dynamical consequences.
The prototypical example is given by $SU(2)$ sphalerons and their potentia
l role in baryogenesis. Transitions between topologically inequivalent vac
ua can produce some irreversible net amount of chiral charge.\n\nAt a firs
t glance\, it does not seem that similar effects may be obtained with Abel
ian fields as they have a topologically non-degenerate vacuum. Looking mor
e closely\, one may realise that the addition of a background magnetic fie
ld changes the picture. \n\nThe aim of this talk is to present an investig
ation of such systems based on real-time simulations. In particular\, we w
ill give some context by presenting the numerical set up\, before discussi
ng results on the U(1) Chern-Simons diffusion rate in a constant magnetic
background. We will also discuss the evolution of the chiral chemical pote
ntial.\n\nhttps://indico.fnal.gov/event/15949/contributions/34717/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34717/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Proton spin decomposition
DTSTART;VALUE=DATE-TIME:20180727T150000Z
DTEND;VALUE=DATE-TIME:20180727T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34716@indico.fnal.gov
DESCRIPTION:Speakers: Yibo Yang (Michigan State University)\nWe calculate
the intrinsic quark and gluon spin contribution to the total proton spin u
sing overlap fermions on Domain-wall ensembles. We find that the total qua
rk spin\, with the axial Ward identity satisfied\, is ~40%\, and the glue
spin contribution is ~50% if the matching procedure in LaMET is neglected.
\n\nThe imperative non-perturbative renormalization to obtain the quark an
d glue angular momentum fractions will be also introduced in the talk.\n\n
https://indico.fnal.gov/event/15949/contributions/34716/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34716/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Porting DDalphaAMG solver to K computer
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34715@indico.fnal.gov
DESCRIPTION:Speakers: Issaku Kanamori (Hiroshima University)\nWe port Doma
in-Decomposed-alpha-AMG solver to K computer.\nThe system has 8 cores and
16 GB memory par node\, of which theoretical\npeak is 128 GFlops (82\,944
nodes in total). Its feature\, as many as 256\nregisters par core and as
large as 0.5 byte/Flop ratio\, requires\na different tuning from other mac
hines.\nIn order to use more registers\, we change some of the data struct
ure\nand rewrite matrix-vector operations with intrinsics.\nThe improvemen
t of the performance is more than factor two for twelve\nsolves including
the setup. The efficiency is still about 5% after\nthe optimization\, whi
ch is lower than a previously tuned mixed precision\nsolver for K computer
\, 22%. The throughput is\, however\,\nalmost three times more for a phys
ical point configuration.\n\nhttps://indico.fnal.gov/event/15949/contribut
ions/34715/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34715/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron Spectroscopy and Resonances Review
DTSTART;VALUE=DATE-TIME:20180725T160000Z
DTEND;VALUE=DATE-TIME:20180725T164500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34714@indico.fnal.gov
DESCRIPTION:Speakers: Padmanath Madanagopalan (Universitaet Regensburg)\n
I review recent results on hadron spectroscopy using lattice QCD. In li
ght of the recent\ndiscoveries in heavy baryon sector at LHCb\, lattice ca
lculations in this regard will be\nemphasized. Recent lattice calculations
on light baryon\, heavy-heavy and heavy-light\nmeson resonances will also
be discussed.\n\nhttps://indico.fnal.gov/event/15949/contributions/34714/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34714/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon EDMs and form factors on a lattice at the physical point
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34713@indico.fnal.gov
DESCRIPTION:Speakers: Sergey Syritsyn (Stony Brook University (SUNY))\nSea
rches for the nucleon electric dipole moments (EDMs) are at the frontier o
f high-precision Nuclear physics. Their discovery would be evidence of CP-
violation\, which is necessary to explain the origin of nuclear matter and
would be a signature of new non-Standard-Model interactions. CP-violation
in the quark-gluon sector can be caused by the presence of the QCD $\\the
ta$-term or higher-order effective quark-gluon interactions. In this talk\
, I will present preliminary results for nucleon EDMs induced by quark-glu
on chromo-electric interactions from a recent calculation with chiral-symm
etric quarks at the physical point. I will also present high-statistics re
sults for nucleon form factors from the same calculation and briefly discu
ss implications for the theoretic determination of the nucleon charge radi
us.\n\nhttps://indico.fnal.gov/event/15949/contributions/34713/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34713/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-size scaling of Polyakov's loop in the 2D Abelian Higgs mod
el
DTSTART;VALUE=DATE-TIME:20180725T202000Z
DTEND;VALUE=DATE-TIME:20180725T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34712@indico.fnal.gov
DESCRIPTION:Speakers: Judah Unmuth-Yockey (Syracuse University)\nStarting
with the 2D Abelian Higgs model with the quartic self-coupling taken infin
itely large we study the finite-size scaling of the Polyakov loop. We fin
d an exponential decay for large temporal extents which is dictated by the
energy gap between the ground states of a system with the Polyakov loop i
nserted\, and one without. We study this system using the tensor renormal
ization group\, and we take the continuous-time limit to obtain a quantum
Hamiltonian where gauge invariance has been maintained exactly. Comparing
with numerical results from the density matrix renormalization group we f
ind universal features of the finite-size scaling of the energy gap surviv
e this continuous-time limit. We propose an optical-lattice ladder to qua
ntum simulate this model\, and observe the universal features of the energ
y gap scaling.\n\nhttps://indico.fnal.gov/event/15949/contributions/34712/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34712/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining the Efficacy of different parameterizations of the z-e
xpansion
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34711@indico.fnal.gov
DESCRIPTION:Speakers: Erik Gustafson (University of Iowa)\nWe present a me
thod of examining the efficacy of different formulations of the z-expansio
n in semileptonic B decays. We examine three different parameterizations o
f the z-expansion\, the BGL\, BCL and a recent Padé expansion. Our method
involves fitting these parameterizations to the large momentum transfer d
ata ($q^2$ > $17 ~GeV^2$) and seeing how well these parameterizations pred
ict the low momentum transfer region ($q^2$ \n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34711/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34711/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Can the complex Langevin method see the deconfinement phase transi
tion in QCD at finite density?
DTSTART;VALUE=DATE-TIME:20180723T192000Z
DTEND;VALUE=DATE-TIME:20180723T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34710@indico.fnal.gov
DESCRIPTION:Speakers: Shoichiro Tsutsui (High Energy Accelerator Research
Organization)\nExploring the phase diagram of QCD at finite density is a c
hallenging problem since first-principle calculations based on standard Mo
nte Carlo methods suffer from the sign problem. As a promising approach to
this issue\, the complex Langevin method (CLM) has been pursued\nintensiv
ely. \n\nIn this talk\, we investigate the applicability of the CLM in the
vicinity of the deconfinement phase transition using the four-flavor stag
gered fermions. A previous study on a $16^3 \\times 8$ lattice showed that
the CLM fails at $\\beta\n\nhttps://indico.fnal.gov/event/15949/contribut
ions/34710/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34710/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\mathcal{O}(a)$ improved quark mass renormalization for a non-pe
rturbative matching of HQET to three-flavor QCD
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34709@indico.fnal.gov
DESCRIPTION:Speakers: Simon Kuberski (Institut für Theoretische Physik\,
Universität Münster)\nThe use of Heavy Quark Effective Theory (HQET) on
the lattice as an approach to B-physics phenomenology is based on a non-pe
rturbative matching of HQET to QCD in finite volume. As a first step to ap
ply the underlying strategy in the three-flavor ($N_f = 2+1$) theory\, we
determine the renormalization constant and improvement coefficients relati
ng the renormalized current and subtracted quark mass of (quenched) valenc
e quarks in $\\mathcal{O}(a)$ improved $N_f=3$ lattice QCD. We present our
strategy and first results for the relevant parameter region towards weak
couplings along a line of\nconstant physics\, which corresponds to lattic
e resolutions $a\\leq 0.02\\\,$fm and fixes the physical extent of the mat
ching volume to $L\\approx 0.5\\\,$fm.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34709/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34709/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical study of QED finite-volume effects using lattice scalar
QED
DTSTART;VALUE=DATE-TIME:20180725T213000Z
DTEND;VALUE=DATE-TIME:20180725T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34708@indico.fnal.gov
DESCRIPTION:Speakers: James Harrison (University of Southampton)\nFinite-v
olume (FV) effects are expected to be large in the presence of QED\, due t
o the long range of the electromagnetic interaction. With large efforts un
der way to include QED effects in lattice calculations\, it is important t
o understand and correct for the associated FV effects. We calculate unive
rsal QED FV effects numerically\, using an efficient method for lattice si
mulation of scalar QED. We find good agreement with analytical calculation
s of power-like FV corrections to the self-energy of scalar particles in m
oving frames\, and to the hadronic vacuum polarisation (HVP)\, in the wide
ly-used QED_L scheme. We also demonstrate the method of infrared improveme
nt\, in which FV effects are suppressed by altering a subset of the photon
modes.\n\nhttps://indico.fnal.gov/event/15949/contributions/34708/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34708/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multilevel integration for meson propagators: disconnected contrib
utions
DTSTART;VALUE=DATE-TIME:20180723T202000Z
DTEND;VALUE=DATE-TIME:20180723T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34707@indico.fnal.gov
DESCRIPTION:Speakers: Tim Harris (Milano Bicocca)\nWe combine multi-level
integration with a variance-reduction technique for the stochastic\nestima
te of disconnected diagrams of various bilinear operators\, and present pr
eliminary\nnumerical results with O($a$)-improved Wilson fermions.\n\nhttp
s://indico.fnal.gov/event/15949/contributions/34707/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34707/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Corrections to Dashen's theorem from lattice QCD and quenched QED
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34706@indico.fnal.gov
DESCRIPTION:Speakers: Balint Toth (University of Wuppertal)\nWe use our Nf
=2+1+1 staggered lattice QCD configurations to compute the corrections to
Dashen's theorem and the quark mass ratio m_u/m_d. We use quark masses ar
ound their physical values\, and reach the continuum limit using 5 differe
nt lattice spacings. We use the QED_L formulation\, and include the QED an
d u-d mass difference effects in the valence sector.\n\nhttps://indico.fna
l.gov/event/15949/contributions/34706/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34706/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermions on Simplicial Lattices and their Dual Lattices
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34705@indico.fnal.gov
DESCRIPTION:Speakers: Alan Horowitz (IUP)\nI will show that naive and stag
gered fermions on simplicial lattices and their dual lattices in any dimen
sion can be formulated about as simply as on hypercubic lattices. Point\
, chiral and discrete symmetry properties are however more subtle. Despit
e the absence of an exact chiral symmetry\, there is no additive mass reno
rmalization. There is an interesting duality between vector and axial vec
tor currents paralleling the duality between the lattices.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34705/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34705/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological Susceptibility to High Temperatures via Reweighting
DTSTART;VALUE=DATE-TIME:20180724T200000Z
DTEND;VALUE=DATE-TIME:20180724T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34704@indico.fnal.gov
DESCRIPTION:Speakers: P. Thomas Jahn (TU Darmstadt)\nAt high temperatures\
, the topological susceptibility of QCD becomes relevant for the propertie
s of axion dark matter. However\, the strong suppression of non-zero topol
ogical sectors causes ordinary sampling techniques to fail\, since fluctua
tions of the topological charge can only be measured reliably if enough tu
nneling events between sectors occur. We present a new method to circumven
t this problem based on a combination of gradient flow and reweighting tec
hniques. Moreover\, we quote continuum extrapolated results for the topolo
gical susceptibility in the quenched approximation at $2.5~T_\\mathrm c$ a
nd $4.1~T_\\mathrm c$.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34704/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34704/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update on $B \\to D^\\ast \\ell \\nu$ form factor at zero-recoil u
sing the Oktay-Kronfeld action
DTSTART;VALUE=DATE-TIME:20180727T194000Z
DTEND;VALUE=DATE-TIME:20180727T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34703@indico.fnal.gov
DESCRIPTION:Speakers: Sungwoo Park (Los Alamos National Laboratory)\nWe up
date the calculation of $B \\to D^\\ast \\ell \\nu$ form factor at zero-re
coil using the Oktay-Kronfeld (OK) action for bottom and charm quarks. Hea
vy quark action is nonperturbatively tuned. The flavor changing currents a
re improved to $\\mathcal{O}(\\lambda\\approx \\Lambda_{QCD}/2m_Q)$\, $Q=b
\,c$ at tree-level in the HQET power counting. We use the HISQ action for
the light spectator quark with several valence quark masses. The calculati
on is done on the $2+1+1$-flavor MILC HISQ ensembles at $a\\approx 0.12$ a
nd $0.09$ fm with pion mass $M_\\pi \\approx 310$ MeV. The excited state c
ontamination in the matrix elements is controlled by using multi-state fit
s on correlators with multiple source-sink separations and stabilized usin
g an empirical Bayesian technique.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34703/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34703/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards lattice-assisted hadron physics calculations based on gaug
e-fixed n-point functions
DTSTART;VALUE=DATE-TIME:20180725T215000Z
DTEND;VALUE=DATE-TIME:20180725T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34702@indico.fnal.gov
DESCRIPTION:Speakers: Andre Sternbeck (University of Jena)\nLattice calcul
ations of RI'(S)MOM renormalization constants typically generate lots of d
ata for gauge-fixed n-point functions. We reuse this data and determine th
e full nonperturbative tensor structure of the underlying vertices. They a
re a crucial input for calculations of hadronic observables formulated as
bound-state problems in QCD. We show first data for the simplest fermionic
bilinears and confront them with solutions obtained for truncated systems
of equations in the continuum.\n\nhttps://indico.fnal.gov/event/15949/con
tributions/34702/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34702/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Excited state analysis in the quasi-PDF matrix elements
DTSTART;VALUE=DATE-TIME:20180723T200000Z
DTEND;VALUE=DATE-TIME:20180723T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34701@indico.fnal.gov
DESCRIPTION:Speakers: Yibo Yang (Michigan State University)\nThe momentum
smearing technique opens a new window on the lattice simulation with the l
arge hadron momentum\, while the good signals are still limited to the dat
a with small source-sink separations. Thus whether the systematic uncertai
nties from the excited state contaminations can be under control with the
those small separations\, will be crucial for the hadron matrix element ca
lculation in the moving frame. We will show our investigations on this top
ic with the quasi-PDF matrix elements.\n\nhttps://indico.fnal.gov/event/15
949/contributions/34701/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34701/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Masses and decay constants of $B_c^{(*)}$ mesons with $N_f =2+1+1$
twisted mass fermions
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34700@indico.fnal.gov
DESCRIPTION:Speakers: Giorgio Salerno (University of Roma Tre & LPT Orsay)
\nWe present a preliminary lattice determination of the masses and decay c
onstants of the pseudoscalar and vector mesons $B_c$ and $B_c^*$. Our anal
ysis is based on the gauge configurations produced by the European Twisted
Mass Collaboration with $N_f=2+1+1$ flavors of dynamical quarks. We simul
ated at three different values of the lattice spacing and with pion masses
as small as 210 MeV. Heavy-quark masses are simulated directly on the lat
tice up to $\\sim 3$ times the physical charm mass. The interpolation to t
he physical b-quark mass is performed using the ETMC ratio method: the bot
tom quark point is reached using ratios of physical quantities computed at
nearby quark masses exploiting the fact that these ratios are exactly kno
wn in the static quark mass limit.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34700/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34700/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hypercubic effects in semileptonic decays of heavy mesons\, toward
$B \\to \\pi \\ell\\nu$ with Nf=2+1+1 Twisted fermions
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34699@indico.fnal.gov
DESCRIPTION:Speakers: Lorenzo Riggio (INFN Sez. Roma Tre)\nWe present a pr
eliminary study toward a lattice determination of the vector\nand scalar f
orm factors of the $B \\to \\pi \\ell \\nu$ semileptonic decays.\nWe compu
te the form factors relative to the transition between pseudo-scalar \nhea
vy mesons\, with masses above the D-mass\, and the pion. We simulate the \
nvalence heavy quark with a mass in the range $ m_c \n\nhttps://indico.fna
l.gov/event/15949/contributions/34699/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34699/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Lattice Study of Renormalons in Asymptotically Free Sigma Models
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34698@indico.fnal.gov
DESCRIPTION:Speakers: Matthias Puhr (University of Regensburg)\nIn general
\, perturbative expansions of observables in quantum field\ntheories are d
ivergent (asymptotic) series. It is often possible to\napply resummation t
echniques to assign a unique finite value to the\nasymptotic series\, but
a particular pattern of divergence\, the\nso-called renormalon\, gives ris
e to non-perturbative ambiguities. The\nframework of numerical stochastic
perturbation theory (NSPT)\, based on\nstochastic quantisation and the Lan
gevin equation\, allows us to\ncompute the coefficients of perturbative ex
pansions up to very high\norders (>40) on the lattice. In this talk we pre
sent first results for an\nNSPT study of asymptotically free sigma models
and discuss possible\nrenormalon signatures in the expansion of the energy
density.\n\nhttps://indico.fnal.gov/event/15949/contributions/34698/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34698/
END:VEVENT
BEGIN:VEVENT
SUMMARY:eBRST SU(2) Gauge Theory on Lattice
DTSTART;VALUE=DATE-TIME:20180724T202000Z
DTEND;VALUE=DATE-TIME:20180724T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34697@indico.fnal.gov
DESCRIPTION:Speakers: Mugdha Sarkar (Saha Institute of Nuclear Physics)\nE
quivariant BRST (eBRST) SU(2) gauge theory involves gauge fixing in the SU
(2)/U(1) coset space leaving the subgroup U(1) gauge invariant. This can b
e taken as an alternative formulation of SU(2) lattice gauge theory that u
ses gauge-fixing\, evading the no-go theorem by Neuberger preventing the u
se of standard BRST. Results will be presented for our numerical simulatio
n of the eBRST gauge theory\, generalised with addition of a mass term (fo
r both the ghost fields and the gauge fields in the coset space) that keep
s the eBRST symmetry intact. The theory in the reduced limit has also a gl
obal SU(2) symmetry which has been speculated in the literature to undergo
a spontaneous breaking to U(1). Our results on this possible spontaneous
symmetry breaking and its implication for possible continuum limit will be
presented.\n\nhttps://indico.fnal.gov/event/15949/contributions/34697/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34697/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clover HMC and Staggered Multigrid on Summit/Volta
DTSTART;VALUE=DATE-TIME:20180725T211000Z
DTEND;VALUE=DATE-TIME:20180725T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34696@indico.fnal.gov
DESCRIPTION:Speakers: Kate Clark (NVIDIA)\nWe report on recent work to int
egrate and optimize QUDA's adaptive multi-grid solver into Chroma RHMC Wil
son-clover gauge evolution. Particular emphasis has been paid to optimiza
tion for the new Volta-powered Summit supercomputer. When combined with o
ther recent improvements into Chroma's molecular dynamics implementation\,
in moving from Titan to Summit we achieve close to an aggregate 100x impr
ovement in throughput in gauge evolution.\n\nFinally\, we report on the on
going project to incorporate staggered multigrid into QUDA. We have comple
ted an initial four-dimensional implementation based on our two-dimensiona
l algorithm and will present initial results on dynamical gauge configurat
ions\, concluding with prospects for integrating multigrid into staggered
gauge evolution.\n\nhttps://indico.fnal.gov/event/15949/contributions/3469
6/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34696/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fourier acceleration\, the HMC algorithm and renormalizability
DTSTART;VALUE=DATE-TIME:20180723T190000Z
DTEND;VALUE=DATE-TIME:20180723T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34695@indico.fnal.gov
DESCRIPTION:Speakers: Norman Christ (Columbia University)\nThe analysis of
the Hybrid Monte Carlo (HMC) algorithm developed by Luscher and Schaefer
is generalized to include Fourier acceleration. We show for the $\\phi^4$
theory examined by Luscher and Schaefer that Fourier acceleration removes
the non-renormalizable\, singular behavior which they discovered and like
ly defines a renormalizable theory for the five-dimensional correlation fu
nctions in Euclidean space and Monte Carlo time.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34695/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34695/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Do not measure correlated observables\, but train an artificial in
telligence to predict them
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34694@indico.fnal.gov
DESCRIPTION:Speakers: Boram Yoon (Los Alamos National Laboratory)\nIn latt
ice QCD calculations\, many different observables are measured on a gauge
field\, and their statistical fluctuations are correlated. By exploiting t
he correlation\, one observable can be reconstructed from other observable
s\, without expensive direct calculation. This idea is applied to two nucl
eon matrix element calculations using machine learning technique.\n\n(1) T
he calculations of nucleon charges and form-factors need observables at mu
ltiple separations of nucleon source and sink in Euclidean time ($t_\\text
{sep}$) to remove excited state contamination. We trained a boosted decisi
on tree regression machine learning algorithm to predict observables at $t
_\\text{sep} = 8a$ and $10a$ from the observables at $ t_\\text{sep} = 12a
$ on a $a=0.09$ fm lattice. (2) In the Schwinger source method for the qua
rk chromo-electric dipole moment (cEDM)\, nucleon matrix elements are calc
ulated from the quark propagators including CP-violating operators. We tra
ined a machine to predict two-point correlation functions of the cEDM- and
$\\gamma_5$-inserted quark propagators from those of normal quark propaga
tors without CP-violating operators.\n\nhttps://indico.fnal.gov/event/1594
9/contributions/34694/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34694/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral functions from machine learning
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34693@indico.fnal.gov
DESCRIPTION:Speakers: Heng-Tong Ding (Central China Normal University)\nTh
e spectral function is the key for understanding the in-medium hadron prop
erties as well as the transport properties of the medium.\nSuch as the dis
sociation temperatures of quarkonia\, diffusion coefficients\, dilepton em
ission rates as well as viscosities can be read-off \nfrom various corresp
onding spectral functions. As well-known that the spectral function is hid
den in the lattice-computable correlation \nfunctions and has to be extrac
ted from correlators\, many methods\, e.g. Maximum Entropy Methods and its
variants\, and stochastic methods \nhave been discussed and applied to so
lve this ill-posed inversion problem. \n\nHere we will present a machine l
earning approach to extract spectral functions from temporal correlation f
unctions. \nThis approach\, unlike others\, can build in the true answer i
n the algorithm. We will start discussing the applicability and advantages
of this approach\nby showing some mock data tests mimicking the physical
situation at serval temperatures below and above the transition temperatur
e\,\nin particular the applicability to extract transport peaks is stresse
d. We will then proceed to apply the method to real lattice data of tempor
al correlators. \nThese correlators have been obtained on very fine isotro
pic lattices in quenched QCD using clover-improved Wilson fermions. The i
nverse lattice spacing is around 23 GeV and the spatial extent is 192 with
aspect ratios ranging from 2 to 4 corresponding to the temperature region
from 0.75 Tc to 1.5Tc.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34693/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34693/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B_c spectroscopy using highly improved staggered quarks
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34692@indico.fnal.gov
DESCRIPTION:Speakers: Andrew Lytle (University of Glasgow)\nUsing MILC ens
embles of highly improved staggered quarks (HISQ) with lattice spacings do
wn to a=.044 fm\, we report results obtained from heavyonium and heavy-cha
rm HISQ correlators. Using HISQ valence quarks on successively finer latti
ces allows us to simulate near (and in fact just beyond) the b-quark mass.
\nIn particular we focus on the Bc(2S) energy\, which we compare with O($
\\alpha_s$)-improved non-relativistic QCD results computed on the same ens
embles.\n\nhttps://indico.fnal.gov/event/15949/contributions/34692/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34692/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization of d≤6 CP-Violating Operators in Perturbative QC
D
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34976@indico.fnal.gov
DESCRIPTION:Speakers: Matthew Rizik (National superconducting cyclotron la
boratory)\nWe use the Yang-Mills Gradient flow to study the NLO mixing of
CP-violating operators in continuum QCD with special attention to Weinberg
’s d=6 purely gluonic operator. This method allows for a clear derivatio
n of the Wilson coefficients of the CP-violating effective action as they
pertain to the renormalization group equation. This perturbative calculati
on is the first step towards a high-energy matching of matrix elements inv
olving the CP-violating operators.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34976/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion Form Factor Calculation
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34975@indico.fnal.gov
DESCRIPTION:Speakers: Gen Wang (University of Kentucky)\nWe present the fo
rm factor of pion using overlap fermion. We work on 2+1 flavor domain-wall
configurations on $24^3\\times 64$ lattice with lattice spacing $a=0.083
\\\, {\\rm{fm}}$ and $32^3 \\times 64$ lattice with lattice spacing $a=0.0
83 \\\, {\\rm{fm}}$ genterated by RBC/UKQCD collaboration. With multi--mas
s algorithm\, we do an extrapolatiion of finite lattice spacing and varies
valence quark masses to form factor at pysical pion with a range of space
-like $Q^2$ from 0.0 to 0.6 ${\\rm{GeV^2}}$.\n\nhttps://indico.fnal.gov/ev
ent/15949/contributions/34975/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34975/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent Progress on the QCD Phase Diagram
DTSTART;VALUE=DATE-TIME:20180724T170000Z
DTEND;VALUE=DATE-TIME:20180724T173000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34974@indico.fnal.gov
DESCRIPTION:Speakers: Swagato Mukherjee (BNL)\nI will review the recent pr
ogress and results on the \nbulk thermodynamic properties of QCD matter fr
om Lattice. In particular I will \nhighlight the recent calculations of th
e equation of state\, pressure of \nQCD matter to the finite baryon densit
y regime as far as $\\mu_B/T~2.5$\, giving\nus some preliminary bounds on
the location of the critical end-point. \nI will also stress upon the fact
that Lattice techniques are now entering \ninto precision era where it ca
n provide us with new insights on even the \nmicroscopic degrees of freedo
m in different phases of QCD. I will discuss\nsome instances from the rece
nt studies of of topological fluctuations and \nscreening masses. The prog
ress in the understanding of transport \nproperties of the QCD matter and
the effects of anomalous $U_A(1)$ \nsymmetry on the chiral crossover trans
ition will also be discussed.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34974/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group properties of scalar field theories using gr
adient flow
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34973@indico.fnal.gov
DESCRIPTION:Speakers: Andrea Carosso (University of Colorado\, Boulder)\nG
radient flow has proved useful in the definition and measurement of renorm
alized quantities on the lattice. Recently\, the fact that it suppresses h
igh-modes of the field has been used to construct new\, continuous RG tran
sformations on the lattice\, distinct from the usual blocking techniques i
n spin models and gauge theories. In this talk\, we discuss two approaches
to define an RG transformation which incorporate gradient flow: (1) the c
orrelator ratio method\, and (2) Langevin exact RG. We present preliminary
numerical results for the critical exponents at the Wilson-Fisher fixed p
oint of three-dimensional scalar $\\phi^4$ theory from both methods.\n\nht
tps://indico.fnal.gov/event/15949/contributions/34973/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machines and Algorithms for Lattice QCD
DTSTART;VALUE=DATE-TIME:20180728T140000Z
DTEND;VALUE=DATE-TIME:20180728T144500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34972@indico.fnal.gov
DESCRIPTION:Speakers: Meifeng Lin (Brookhaven National Laboratory)\nI will
review recent progress in software development for lattice QCD on novel a
rchitectures and new machines. I will also report some algorithmic advance
ments in ensemble generation\, solvers and contractions.\n\nhttps://indico
.fnal.gov/event/15949/contributions/34972/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Proton decay matrix element on lattice at physical pion mass
DTSTART;VALUE=DATE-TIME:20180723T192000Z
DTEND;VALUE=DATE-TIME:20180723T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34971@indico.fnal.gov
DESCRIPTION:Speakers: Jun-sik Yoo (Stony Brook University)\nProton decay i
s one of possible signatures of baryon number violation\, which has to exi
st to explain the baryon asymmetry and the existence of nuclear matter. Pr
oton decays must be mediated through effective low-energy baryon number vi
olating operators made of three quarks and a lepton. We calculate matrix e
lements of these operators between an initial proton and various final pse
udoscalar mesons using the three-point function method. For the first time
\, we use the 2+1 dynamical flavor domain wall fermions at the physical po
int for the calculation over the three source-sink separations.\n\nhttps:/
/indico.fnal.gov/event/15949/contributions/34971/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:HISQ light quark hadronic vacuum polarization contribution to the
muon anomalous magnetic moment
DTSTART;VALUE=DATE-TIME:20180727T213000Z
DTEND;VALUE=DATE-TIME:20180727T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34970@indico.fnal.gov
DESCRIPTION:Speakers: Thomas Blum (University of Connecticut)\nWe present
preliminary results for the (connected) hadronic vacuum polarization (HVP)
contribution to the muon anomalous magnetic moment (g-2). The HVP is comp
uted for degenerate up and down quarks at the physical point on HISQ 2+1+1
flavor ensembles generated by the MILC collaboration. We use all mode and
low mode averaging with 2000-3000 lowmodes to obtain precise statistics.
Calculations performed at three lattice spacings (0.06\, 0.09\, and 0.12 f
m) are used to estimate the continuum limit in finite volume. Chiral pertu
rbation theory is used to estimate the finite volume effect. We compare to
other recent results.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34970/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Short Range Operator Contributions to neutrinoless double beta dec
ay from LQCD
DTSTART;VALUE=DATE-TIME:20180724T202000Z
DTEND;VALUE=DATE-TIME:20180724T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34969@indico.fnal.gov
DESCRIPTION:Speakers: Henry Monge-Camacho (College of William and Mary\, L
BNL)\nA strong candidate to search for new physics Beyond the Standard Mod
el is neutrinoless double beta decay. Observation of this very rare nuclea
r process which violates lepton number conservation\, would imply the neut
rino sector has a majorana mass component and may also provide an explanat
ion for universe's matter-antimatter asymmetry. In the case a heavy majora
na neutrino is exchanged in this process\, QCD contributions from short ra
nge interactions may become relevant which involve the calculation of matr
ix elements with four-quark operators. In this talk I will discuss the cur
rent progress on the calculation of these four-quark operators from LQCD.\
n\nhttps://indico.fnal.gov/event/15949/contributions/34969/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34969/
END:VEVENT
BEGIN:VEVENT
SUMMARY:10 Years of QUDA
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34968@indico.fnal.gov
DESCRIPTION:Speakers: Saul Cohen (NVIDIA)\nThis year\, 2018\, the QUDA lib
rary for Lattice QCD on NVIDIA GPUs celebrates its tenth birthday. QUDA ha
s evolved from an acceleration library for solvers into an open-source fra
mework for developing QCD simulations. It supports many different fermion
discretizations\, and features algorithms like adaptive multigrid\, deflat
ion and block Krylov-space methods. QUDA uses various techniques such as m
ixed precision and communication hiding to maximize performance. We will p
resent the current state of QUDA and discuss performance on current hardwa
re. We strongly encourage discussions about user requests and contribution
s.\n\nhttps://indico.fnal.gov/event/15949/contributions/34968/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update on the improved lattice calculation of direct CP-violation
in K decays
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34967@indico.fnal.gov
DESCRIPTION:Speakers: Christopher Kelly (Columbia University)\nWe provide
an update on the RBC & UKQCD lattice calculation of the measure of Standar
d Model direct CP-violation in kaon decays\, \\epsilon'\n\nhttps://indico.
fnal.gov/event/15949/contributions/34967/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34967/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon spectrum of SU(4) composite Higgs theory with two distinct
fermion representations
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34966@indico.fnal.gov
DESCRIPTION:Speakers: William Jay (University of Colorado Boulder)\nWe des
cribe our recent lattice study of the baryon spectrum of SU(4) gauge theor
y with fully dynamical Wilson-clover fermions in the fundamental and sexte
t representations. This system is closely related to a model of physics be
yond the Standard Model containing a composite Higgs. The model also conta
ins a partially composite top quark\, which mixes linearly with a new bary
on of SU(4) containing fermions in both representations. We will describe
the overall baryon spectrum and implications for collider searches for the
top quark partner.\n\nhttps://indico.fnal.gov/event/15949/contributions/3
4966/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34966/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress towards understanding the H-dibaryon from lattice QCD
DTSTART;VALUE=DATE-TIME:20180726T174000Z
DTEND;VALUE=DATE-TIME:20180726T180000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34965@indico.fnal.gov
DESCRIPTION:Speakers: Andrew Hanlon (Helmholtz-Institut Mainz\, JGU)\nSign
ificant experimental and theoretical efforts to determine the existence an
d nature of the $H$-dibaryon have been underway since its prediction in 19
77. Yet\, conclusive evidence for such a bound state is still lacking. Res
ults from various lattice QCD calculations show substantial disagreement f
or the binding energy. Since there is no conclusive evidence for or agains
t the existence of a bound $H$-dibaryon\, the Mainz group has joined the e
ffort towards resolving the discrepancies. In this talk\, I will first giv
e an overview of the recent results from the Mainz group obtained in two-f
lavor QCD. I will then discuss work that has been done towards ensuring th
at the baryon-baryon operators used in the $H$-dibaryon studies transform
irreducibly under the relevant little group. Finally\, the prospects of ex
tensions to $N_f = 2 + 1$ and the use of distillation for moving frames wi
ll be examined.\n\nhttps://indico.fnal.gov/event/15949/contributions/34965
/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED-corrected Lellouch-Luescher formula for K->\\pi\\pi decay
DTSTART;VALUE=DATE-TIME:20180726T174000Z
DTEND;VALUE=DATE-TIME:20180726T180000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34964@indico.fnal.gov
DESCRIPTION:Speakers: Yiming Cai (University of Maryland\, College Park)\n
A precise Standard Model prediction for the direct CP violation in the K -
> \\pi\\pi decay process is of great importance in confronting experiments
and constraining new physics. The state-of-art lattice QCD precision of t
his process will soon achieve a value for which QED effects can no longer
be neglected. The inclusion of QED in such calculations is planned and the
formalism to relate the finite-volume matrix element obtained from these
calculations to the physical amplitude is underway. Here we present prelim
inary results on the extension of Lellouch-Luscher formula in presence of
QED\, therefore providing such formalism for the extraction of physical am
plitudes for the K->\\pi\\pi process with charged initial and/or final sta
tes.\n\nhttps://indico.fnal.gov/event/15949/contributions/34964/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34964/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The fate of axial U(1) and the topological susceptibility in QCD w
ith two light quarks
DTSTART;VALUE=DATE-TIME:20180724T192000Z
DTEND;VALUE=DATE-TIME:20180724T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34963@indico.fnal.gov
DESCRIPTION:Speakers: Lukas Mazur (Bielefeld University)\nThe region of th
e Columbia plot with two light quark flavors is not yet conclusively under
stood. Non-perturbative effects\, e.g. the magnitude of the anomalous U(1
) axial symmetry breaking decides on the nature of the phase transition in
this region. We report on our study of this region of the Columbia plot u
sing lattice techniques. We use gauge ensembles generated within the Highl
y Improved Staggered Quark discretization scheme\, with the strange quark
mass fixed at its physical value and the light quark mass varied such that
m_l=m_s/27\, m_s/40\, m_s/80\, where m_l=m_s/27 corresponds to the physic
al light quark mass. \nWe study the eigenvalue spectrum of QCD at finite t
emperature around the chiral transition temperature T_c\, as the light qua
rk masses approach towards the chiral limit and infer about the fate of a
nomalous U(1) symmetry. We also show how the topological susceptibility of
QCD at finite temperature varies as one goes towards the chiral limit.\n\
nhttps://indico.fnal.gov/event/15949/contributions/34963/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$Z_2$ gauge theory with tensor renormalization group
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34962@indico.fnal.gov
DESCRIPTION:Speakers: Yusuke Yoshimura (CCS\, University of Tsukuba)\nTens
or renormalization group is a new type of numerical method which does not
suffer from the sign problem.\nWe have developed the tensor renormalizatio
n group for 3-dimensional $Z_2$ gauge theory.\nWe apply it to finite tempe
rature $Z_2$ gauge thery in (2+1) dimensions and\ncompare the results with
those obtained by a previous Monte Carlo study.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34962/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ensemble Quasi-Newton HMC
DTSTART;VALUE=DATE-TIME:20180723T194000Z
DTEND;VALUE=DATE-TIME:20180723T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34961@indico.fnal.gov
DESCRIPTION:Speakers: Xiaoyong Jin (ANL)\nWe present a modification of the
hybrid Monte Carlo algorithm for\ntackling the critical slowing down of g
enerating Markov chains of\nlattice gauge configurations towards the conti
nuum limit. We propose\na new method to exchange information between an e
nsemble of Markov\nChains\, and use it to construct an approximate inverse
Hessian\nmatrix of the action inspired from Quasi-Newton algorithms for\n
optimization. The kinetic term of the molecular dynamic evolution\ninclud
es the approximate Hessian for long distance couplings among\nthe momenta.
We will show the result of applying the new algorithm\nto the U(1) gauge
theory in two dimensions\, and discuss our future\nplans.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34961/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuum extrapolation of the critical endpoint in 4-flavor QCD w
ith Wilson-Clover fermions
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34960@indico.fnal.gov
DESCRIPTION:Speakers: Hiroshi Ohno (University of Tsukuba)\nWe report our
updated study on the critical endpoint of the finite temperature phase tra
nsition in 4-flavor QCD with Wilson-Clover fermions. Using the kurtosis in
tersection method\, we determined the critical endpoint on lattices with $
N_t$ = 4\, 6 and 8. Our continuum extrapolated result shows that the criti
cal pion mass is clearly larger compared to one in 3-flavor\, which sugges
ts that the critical pion mass in 4-flavor might remain finite even in the
continuum limit in contrast to the staggered quark case.\n\nhttps://indic
o.fnal.gov/event/15949/contributions/34960/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupled channel scattering of vector and scalar charmonium resonan
ces on the lattice
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34959@indico.fnal.gov
DESCRIPTION:Speakers: Stefano Piemonte (University of Regensburg)\nMany ex
otic charmonium resonances have been identified recently in experiment\, h
owever their nature and properties are mostly unknown. Algorithmic and the
oretical progress in lattice calculations has enabled reliable numerical i
nvestigation of the charmonium spectrum below the strong decay threshold\,
while the study of resonances remain an open challenge. The main difficul
ty to overcome is the presence of many open decay channels which are coupl
ed together\, resulting in a complex finite volume quantization condition.
We report on our recent progress towards the determination of physical s
cattering parameters in the scalar and vector channel on CLS ensembles. We
also present an update concerning the study of the charmonium spectrum in
moving frames.\n\nhttps://indico.fnal.gov/event/15949/contributions/34959
/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34959/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low temperature condensation and scattering data
DTSTART;VALUE=DATE-TIME:20180724T215000Z
DTEND;VALUE=DATE-TIME:20180724T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34958@indico.fnal.gov
DESCRIPTION:Speakers: Oliver Orasch (University of Graz)\nWe study a compl
ex $\\phi^4$ field at finite temperature and finite density using a worldl
ine representation. In particular we focus on the low temperature regime w
here the particle number shows condensation steps as a function of the che
mical potential. The critical values of the chemical potential\, i.e.\, th
e condensation thresholds\, are related to the mass and higher multi-parti
cle energies and can be determined within a simulation. We study the first
three condensation thresholds\, i.e\, $\\mu^{(i)}_c\, \\\, i = 1\,2\,3$\,
which are linked to the 2- and 3-particle energies as a function of the s
patial volume $L^{d-1}$. The L-dependence of the multi-particle energies i
s described by Lüscher's formula in the 2-particle sector and by its gene
ralization in the 3-particle case. These finite size scaling functions car
ry the scattering information. Finally\, we cross-check the results with c
onventional simulations at vanishing chemical potential where we extract t
he mass and the 2- and 3-particle energies from the 2-\, 4- and 6-point co
rrelation functions.\n\nhttps://indico.fnal.gov/event/15949/contributions/
34958/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34958/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$J/\\psi$-nucleon scattering in $P_{c}^{+}$ pentaquark channels
DTSTART;VALUE=DATE-TIME:20180727T204000Z
DTEND;VALUE=DATE-TIME:20180727T210000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34957@indico.fnal.gov
DESCRIPTION:Speakers: Ursa Skerbis (Jozef Stefan Institute\, Ljubljana\, S
lovenija)\nTwo pentaquarks $P_{c}^{+}$ were discovered by LHCb collaborat
ion as peaks in the $J/\\psi$-nucleon invariant mass. We performed the lat
tice QCD study of the scattering between $J/\\psi$ meson and nucleon in th
e channels with $J^{P}=\\frac{3}{2}^{+}\,\\frac{3}{2}^{-}\, \\frac{5}{2}^{
+}\, \\frac{5}{2}^{-}$\, where $P_{c}^{+}$ was discovered. Energies of the
eigenstates in these channels are extracted for the first time from the l
attice. We consider the single-channel approximation as a first step towa
rds understanding these challenging channels.\n\nhttps://indico.fnal.gov/e
vent/15949/contributions/34957/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From FRIB to Lattice QCD
DTSTART;VALUE=DATE-TIME:20180723T142000Z
DTEND;VALUE=DATE-TIME:20180723T150000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34956@indico.fnal.gov
DESCRIPTION:Speakers: Dean Lee (Michigan State University)\nThe Facility f
or Rare Isotope Beams (FRIB) is a DOE national user facility being built a
t Michigan State University that will be a world leader in rare nuclear is
otopes. The first part of the talk is an overview of the design and curren
t status of the facility. The second part discusses the impact of FRIB on
nuclear science\, astrophysics\, fundamental symmetries\, and societal ap
plications. The last part of the talk explores opportunities for lattice
QCD theorists to contribute to new discoveries at FRIB.\n\nhttps://indico.
fnal.gov/event/15949/contributions/34956/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral phase transition in (2 + 1)-flavor QCD
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34955@indico.fnal.gov
DESCRIPTION:Speakers: Sheng-Tai Li (Central China Normal University)\nThe
chiral phase transition temperature $T_{c}$ is a fundamental quantity of Q
CD. To determine this quantity\, we have performed simulations of (2 + 1)-
flavor QCD using the Highly Improved Staggered Quarks (HISQ) action on $N_
{\\tau}=6\, 8\, 12$ lattices and aspect ratios $N_{\\sigma}/N_{\\tau}$ ran
ging from 4 to 7. \nIn our simulations\, we fix the strange quark mass val
ue to its physical value $m_{s}^{\\rm{phy}}$\, and the values of two degen
erate light quark masses $m_{l}$ are varied from $m_{s}^{\\rm{phy}}/160$ t
o $m_{s}^{\\rm{phy}}/20$ which correspond to a Goldstone pion mass $m_{\\p
i}$ ranging from 55 MeV to 160 MeV in the continuum limit.\nBy investigati
ng the light quark mass dependence and volume dependence of various chiral
observables\, e.g. chiral susceptibilities and Binder cumulants\, we didn
't find any evidence for a first order phase transition in our current qua
rk mass window.\nBy looking at the crossing point of $\\chi_{\\sigma}/\\ch
i_{\\pi}=m_{l}\\chi_{tot}/\\left\\langle \\bar{\\psi} \\psi\\right\\rangle
_{l}$ which is the ratio of light quark mass times chiral susceptibilities
and chiral condensates as a function of $T$ and $m_{l}$\, we are able to
extract the value of $T_{c}$ in the chiral & continuum limit without refer
ring to critical exponents of a particular universality class. The uncerta
inty in the determination of $T_{c}$ is also discussed.\n\nhttps://indico.
fnal.gov/event/15949/contributions/34955/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34955/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetric and conformal theories on the lattice: from super Y
ang-Mills towards super QCD
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34954@indico.fnal.gov
DESCRIPTION:Speakers: Georg Bergner (Friedrich-Schiller-Universität Jena\
, WWU Münster)\nThis talk is an overview of our recent investigations of
supersymmetric and near conformal gauge theories. We have studied extensiv
ely $\\mathcal{N}=1$ super Yang-Mills theory\, most recently with the gaug
e group SU(3). In addition we have investigated theories that show indicat
ions for a conformal behaviour with an infrared fixed point. More recently
we have included a mixed fundamental and adjoint fermion action setup in
our studies. I will explain how this is related to the investigation of su
persymmetric QCD on the lattice and present some first studies of the main
obstacles that need to be addressed in the investigation of this theory.\
n\nhttps://indico.fnal.gov/event/15949/contributions/34954/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy quark scaling of $B \\to \\pi \\ell \\nu$ form factors with
Mobius domain wall fermions
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34953@indico.fnal.gov
DESCRIPTION:Speakers: Brian Colquhoun (KEK)\nWe report on the progress of
our calculation of form factors for the exclusive semileptonic decay of B
mesons to pions on $2+1$ flavour lattices with spacings from $0.080~\\math
rm{fm}$ down to $0.044~\\mathrm{fm}$. Using the Mobius domain wall fermion
action for all quarks\, we simulate pions with masses down 230 MeV over a
range of momenta\, and extrapolate to the bottom quark mass by utilising
multiple heavy quark masses up to 2.44 times the mass of the charm quark.
We discuss how the form factors depend on the pion mass\, the heavy quark
mass\, lattice spacing\, and momentum transfer.\n\nhttps://indico.fnal.gov
/event/15949/contributions/34953/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34953/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a determination of the quark-chromo EDM with the gradient
flow
DTSTART;VALUE=DATE-TIME:20180724T192000Z
DTEND;VALUE=DATE-TIME:20180724T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34952@indico.fnal.gov
DESCRIPTION:Speakers: Jangho Kim (NSCL &\; Michigan State University)\n
The quark-chrom EDM (qCEDM) is a dimension 5 operator parametrizing at low
energy BSM contributions to a non-vanishing EDM.\nWe discuss the implemen
tation of the qCEDM with the gradient flow and show preliminary results fo
r the flow-time dependence of the CP-violating mixing angle $\\alpha_N$ in
duced by the qCEDM between nucleon states.\nThese results are computed on
the $N_f=2+1$ coarse lattice $16^3 \\times 32$ with lattice spacing ($a \\
simeq 0.1215 fm$). We use Wilson-clover fermion with $\\kappa=0.13825$ and
$c_{SW}=1.761$.\n\nhttps://indico.fnal.gov/event/15949/contributions/3495
2/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34952/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the calculation and use of non-zero momentum correlators in lat
tice simulations.
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34951@indico.fnal.gov
DESCRIPTION:Speakers: Claudio Rebbi ()\nIn lattice simulations one general
ly projects correlators over zero\nspatial momentum to calculate masses an
d related spectral data. The sum over space lattice points\, however\, dis
cards information which may be useful especially in the calculation of dis
connected diagrams. I will show that\, by using momentum conservation\, t
he calculation of non-zero momentum components of disconnected diagrams an
d other quantities related to space convolutions can be done with little a
dditional computational cost and I will discuss how these calculations mig
ht be useful in the analysis of disconnected correlators. (With the LSD co
llaboration.)\n\nhttps://indico.fnal.gov/event/15949/contributions/34951/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34951/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Controlling Excited-State Contributions to Nucleon Isovector Charg
es using Distillation
DTSTART;VALUE=DATE-TIME:20180725T194000Z
DTEND;VALUE=DATE-TIME:20180725T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34950@indico.fnal.gov
DESCRIPTION:Speakers: Colin Egerer (William and Mary)\nAs all lattice calc
ulations are subject to a trade-off between excited-state contamination at
short Euclidean times and an increased signal-to-noise ratio at large Euc
lidean times\, the need for reduced or removed excited-state effects is pa
ramount. Perhaps the most notable in lattice calculations is that of the a
xial charge of the nucleon\, wherein calculations have historically differ
ed from the world average by roughly 10%. Widely used methods to tame the
impact of excited states on lattice n-point functions include the Jacobi a
nd Wuppertal smearing techniques\, and the variational method. An alternat
ive smearing algorithm called Distillation has garnered much attention in
spectroscopy calculations for its utility in efficiently identifying a ple
thora of hadronic states across a wide range of quantum numbers\, includin
g some of hybrid nature. Distillation provides several advantages includin
g explicit momentum projection at source and sink\, and the correlation of
arbitrarily complicated interpolators once a single set of modified quark
propagators have been computed. That said\, Distillation has as of yet se
en little use in structure calculations. In this presentation we discuss t
he implementation of Distillation in the calculation of the nucleon isovec
tor charges $g_A$\, $g_S$ and $g_T$. Rather than seek precise determinatio
ns of said charges\, we instead highlight the demonstrable improvements ac
hieved in calculated matrix elements by combining Distillation with the va
riational method. By employing a basis of several Distilled interpolators\
, including some of hybrid character\, we demonstrate an earlier onset of
a plateau region in calculated nucleon matrix elements and stability of sa
id plateaus under variations of the source/sink interpolator separation. W
hen compared to Jacobi smeared interpolators used in previous variational
analyses\, Distillation appears to afford greater statistical precision in
extracted matrix elements as reliable estimates are attainable at much sh
orter Euclidean times. Comparisons are also made to other recent strategie
s seeking to control excited-state effects\, and prospects are sketched fo
r the potential efficacy of Distillation in future structure calculations\
, such as the many works seeking to calculate parton distribution function
s.\n\nhttps://indico.fnal.gov/event/15949/contributions/34950/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34950/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating Quantum Chromodynamics coupled with Quantum Electromagn
etics on the lattice
DTSTART;VALUE=DATE-TIME:20180724T211000Z
DTEND;VALUE=DATE-TIME:20180724T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34949@indico.fnal.gov
DESCRIPTION:Speakers: Yuzhi Liu ()\nWe present recent developments on our
lattice simulations of fully dynamical $SU(3)\\times U(1)$. Including elec
tromagnetic effects is critical for the next level of precision in phenome
nology. Examples include calculating the (higher order) QED contributions
to the hadronic-vacuum-polarization contribution to the muon anomalous mag
netic moment and calculating the QED contributions to meson and baryon mas
s splittings. We recently developed and tested a dynamical QCD+QED extensi
on of the MILC code. We use the non-compact version of QED in this code. W
e discuss details of the simulation algorithms\nand analyze the code perfo
rmance. If time permits\, we will also discuss plans for exascale computin
g.\n\nhttps://indico.fnal.gov/event/15949/contributions/34949/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34949/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupling to Multihadron States with Chiral Fermions
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34948@indico.fnal.gov
DESCRIPTION:Speakers: Jacob Fallica Fallica (University of Kentucky)\nChir
al symmetry is presumed to be a crucial component in the strong interactio
n and QCD\, but its role in spectroscopy\, especially for baryons\, has no
t been fully explored. Compounding this\, chiral fermions are uncommon in
lattice calculations due to their expensive nature. We calculate $\\eta\
\pi$\, $K\\pi$ and $N\\pi$ states with $q\\bar{q}$ and $qqq$ interpolation
fields at $a=0.0114\\\,\\textrm{fm}$ on a $48^3\\times 96$ mixed-action l
attice at physical pion mass\, with domain-wall sea quarks and overlap val
ence quarks. We study the spectral weights of these states as a function
of the valence pion mass\, which ranges from $m_{\\pi}=115-665\\\,\\textrm
{MeV}$\, to be compared with results from non-chiral clover valence quarks
on the same domain-wall lattice in order to examine their non-chiral effe
cts\, which are expected to decrease with the lattice spacing.\n\nhttps://
indico.fnal.gov/event/15949/contributions/34948/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34948/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Calculation of the Proton Charge Radius
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34947@indico.fnal.gov
DESCRIPTION:Speakers: Anthony Grebe (Massachusetts Institute of Technology
)\nThe charge radius of the proton has been measured in scattering and spe
ctroscopy experiments using both electronic and muonic probes. The electro
nic and muonic measurements have a currently unresolved five sigma discrep
ancy\, giving rise to what is known as the proton radius puzzle.\n\nSince
the neutron charge radius is known\, measurement of the proton charge radi
us on the lattice typically involves determination of the isovector form f
actors at various 4-momentum transfers $Q^2$ and then determining the slop
e at $Q^2 = 0$. However\, due to the discretization of momentum on the la
ttice\, there is a systematic uncertainty from extrapolation of the slope
to $Q^2 = 0$. One can access negative values of $Q^2$ if one breaks isosp
in symmetry by introducing a nonzero mass splitting between the up and dow
n quarks and then extrapolating to the limit where this splitting vanishes
. We present preliminary results from this method at unphysical quark mas
ses to determine if this method has the potential to reduce uncertainties.
\n\nhttps://indico.fnal.gov/event/15949/contributions/34947/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34947/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion-pion scattering with physical quark masses
DTSTART;VALUE=DATE-TIME:20180725T200000Z
DTEND;VALUE=DATE-TIME:20180725T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34946@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Hoying ()\nWe present preliminary results on
the scattering of pseudoscalar\, vector\,\nand scalar mesons on a physical
pion mass\, 2+1 flavor mobius-DWF\, ensemble with periodic\nboundary cond
itions (PBCs) generated by the RBC and UKQCD collaborations. Using all-to
-all propagators\, we produce\nthousands of correlator momentum combinatio
ns. Energy spectra and\nphase shifts\, including excited states\, are the
n extracted via the\nsolutions of a generalized eigenvalue problem. Inclu
ded in this talk\nwill also be an overview of the computational strategies
employed\,\nincluding a discussion of split-CG matrix solvers (communicat
ion\navoidance) and lattice crossing symmetry (momentum combinatorics\nred
uction). These studies are intended to serve as groundwork for a\nfull PB
C calculation of direct CP violation in K->pipi later this year.\n\nhttps:
//indico.fnal.gov/event/15949/contributions/34946/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34946/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The eta^prime mass on 2+1 flavor DWF lattices
DTSTART;VALUE=DATE-TIME:20180725T211000Z
DTEND;VALUE=DATE-TIME:20180725T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34945@indico.fnal.gov
DESCRIPTION:Speakers: Duo Guo (Columbai University)\nWe report on measurem
ents of the eta^prime mass on some of the 2+1 flavor DWF ensembles that ha
ve been generated by the RBC and UKQCD collaborations. We investigate the
accuracy of our statistical errors\, given the observed evolution of topo
logical modes on these ensembles.\n\nhttps://indico.fnal.gov/event/15949/c
ontributions/34945/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34945/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon form factors on a (10.8fm)^4 lattice at the physical point
in 2+1 flavor QCD
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34944@indico.fnal.gov
DESCRIPTION:Speakers: Yoshinobu Kuramashi (University of Tsukuba)\nWe pres
ent preliminary results for nucleon form factors calculated with the plate
au method varying the source-sink separation time t_s on a (10.8fm)^4 latt
ice at the physical point in 2+1 flavor QCD. The configurations are genera
ted with the stout-smeared O(a)-improved Wilson quark action and the Iwasa
ki gauge action at beta=1.82 corresponding to the lattice spacing of 0.084
fm. We discuss the momentum dependence of the form factors in very small
transfer momentum region examining a possible t_s dependence.\n\nhttps://i
ndico.fnal.gov/event/15949/contributions/34944/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34944/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon electromagnetic form factors at high momentum transfer fro
m Wilson-clover fermions
DTSTART;VALUE=DATE-TIME:20180726T151000Z
DTEND;VALUE=DATE-TIME:20180726T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34943@indico.fnal.gov
DESCRIPTION:Speakers: Christos Kallidonis (Stony Brook University)\nThe el
ectromagnetic (EM) form factors of the nucleon are fundamental quantities
probing its structure. They have been precisely determined from electron s
cattering experiments as well as extensively studied in lattice QCD calcul
ations. Experiments seeking to explore the behavior of the EM form factors
at high momentum transfer\, such as the physics program of the CEBAF at J
Lab which will allow measurements up to $Q^2\\sim18$ GeV$^2$\, further inc
rease the motivation for a precise lattice evaluation to this high momentu
m transfer.\n\nIn this talk\, we present high statistics results on the nu
cleon EM form factors at $Q^2$ up to 12 GeV$^2$. We analyze two gauge ense
mbles of Wilson-clover fermions with the same lattice spacing value of abo
ut $a=0.094$ fm\, pion masses $m_\\pi = 270$ MeV and $m_\\pi = 180$ MeV\,
and lattice volumes $L=3$ fm and $L=4.5$ fm\, respectively. In our calcul
ations we employ the momentum smearing method in order to increase the sig
nal at high momentum transfer. Various choices of the boost momentum as we
ll as the momentum carried by the quarks at the source and sink are tested
. We consider several values of the source-sink time separation and apply
a set of techniques in order to examine excited state effects. In this fir
st study\, we consider the contributions arising from only connected diagr
ams and compare our results with phenomenology.\n\nhttps://indico.fnal.gov
/event/15949/contributions/34943/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34943/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matching of Nf=2+1 CLS ensembles to a tmQCD valence sector
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34942@indico.fnal.gov
DESCRIPTION:Speakers: Jose Angel Romero Jurado (Instituto de Fisica Teoric
a)\nWe will present a detailed description of the matching of a valence Nf
=2+1+1\nfully-twisted tmQCD action with an Nf=2+1\, non-perturbatively O(a
)-improved\nWilson sea. Extensive preliminary results for meson and quark
masses\, as well as\nfor pseudoscalar decay constants\, are available for
several CLS ensembles. A\ncomparison of the scaling behaviour of the two a
ctions in the light and strange\nquark sectors\, as well as various crossc
hecks of the solidity of the approach\,\nwill be presented.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34942/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34942/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparison between models with and without dynamical charm quarks
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34941@indico.fnal.gov
DESCRIPTION:Speakers: Salvatore Cali (University of Wuppertal)\nWe investi
gate the influence of dynamical charm quarks on observables with an explic
it charm quark dependence\, like the hyperfine splitting\, quark masses an
d meson decay constants. For this purpose\, instead of working in full QCD
we study a simplified setup. \nWe simulate two theories: $N_f=0$ QCD and
QCD with $N_f=2$ degenerate charm quarks. The absence of light quarks allo
ws us to reach extremely fine lattice spacings\n(0.02 fm \n\nhttps://indic
o.fnal.gov/event/15949/contributions/34941/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34941/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Faculty Position Academic-Career Advising
DTSTART;VALUE=DATE-TIME:20180723T173000Z
DTEND;VALUE=DATE-TIME:20180723T183000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34940@indico.fnal.gov
DESCRIPTION:https://indico.fnal.gov/event/15949/contributions/34940/
LOCATION:Kellogg Hotel and Conference Center Big Ten BC
URL:https://indico.fnal.gov/event/15949/contributions/34940/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precise determinations of quark masses
DTSTART;VALUE=DATE-TIME:20180724T154500Z
DTEND;VALUE=DATE-TIME:20180724T161500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34939@indico.fnal.gov
DESCRIPTION:Speakers: Javad Komijani (University of Glasgow)\nWe discuss t
he determination of quark masses using the MILC highly improved staggered-
quark ensembles with four flavors of dynamical quarks. We extract quark ma
sses from heavy-light pseudoscalar meson masses by making use of heavy qua
rk effective theory (HQET) and continuum-QCD perturbative calculations. Wh
ile heavy-light meson masses can be measured very precisely on lattice\, p
erturbative calculations typically suffer from large truncation errors res
ulting in large uncertainties in final results. We present the MRS scheme\
, in which heavy quark masses are free from renormalon ambiguities and any
renormalization scales\, and we discuss how the use of the MRS scheme\, a
s an intermediate scheme\, improves the precision in our calculations. Com
bining our analysis with our separate determination of ratios of light-qua
rk masses we present masses of the up\, down\, strange\, charm\, and botto
m quarks. The method employed in this work also yields the matrix elements
of some operators arising in HQET. Finally\, we discuss and compare our r
esults with other lattice determinations of quark masses.\n\nhttps://indic
o.fnal.gov/event/15949/contributions/34939/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34939/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A linked cluster expansion for the Functional Renormalization Grou
p of the Legendre effective action.
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34938@indico.fnal.gov
DESCRIPTION:Speakers: Rudrajit Banerjee (Department of Physics and Astrono
my\, University of Pittsburgh)\nA lattice version of the widely used\nFunc
tional Renormalization Group (FRG)\nfor the Legendre effective action is\n
solved (exactly) in terms of a linked\ncluster expansion. The graph rules\
ninvoke only one-line irreducible and\na new type of labeled tree graphs.
\nConversely\, the FRG induces nonlinear\nflow equations governing suitab
le\nresummations of the graph expansion. The\ncorrespondence is tested on
the critical\nline of the Luscher-Weisz solution\nof the phi^4 theory. An
extension to\nQFTs on curved spacetimes with flat\nspatial sections is fea
sible.\n\nhttps://indico.fnal.gov/event/15949/contributions/34938/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34938/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hints and challenges in heavy flavor physics
DTSTART;VALUE=DATE-TIME:20180724T161500Z
DTEND;VALUE=DATE-TIME:20180724T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34937@indico.fnal.gov
DESCRIPTION:Speakers: Shoji Hashimoto (KEK)\nHeavy flavor physics has ente
red a new era when the Belle II experiment \nobserved its first collision.
There are several hints found so far by \nBaBar\, Belle\, and LHCb in par
ticular\, that suggest the physics beyond \nthe Standard Model appearing i
n the loop processes at short distances. \nThey will be further tested by
higher precision experiments in the \ncoming years. The role of lattice QC
D is to understand the long-distance\nphysics quantitatively so that one c
an unambiguously isolate the short-\ndistance physics from the experimenta
l data. I'll try to summarize the\nstatus towards this goal and then look
at the challenges we are facing.\n\nhttps://indico.fnal.gov/event/15949/co
ntributions/34937/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34937/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Challenges of Neutrino-Nucleus Scattering
DTSTART;VALUE=DATE-TIME:20180727T164500Z
DTEND;VALUE=DATE-TIME:20180727T171500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34936@indico.fnal.gov
DESCRIPTION:Speakers: Andreas Kronfeld (Fermilab)\nPlans are well underway
in Japan and the US to measure neutrino mixing angles with unprecedented
precision and search for CP-violating phases in the mixing. An important
systematic/theory uncertainty will be that of the neutrino-nucleus cross s
ection. In this talk I illustrate how lattice QCD calculations (combined
with nuclear many-body theory and experimental data) can reduce the uncert
ainty on the oscillation parameters.\n\nhttps://indico.fnal.gov/event/1594
9/contributions/34936/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The hadronic vacuum polarization contribution to $(g-2)_\\mu$ from
$2+1$ flavours of O($a$) improved Wilson quarks
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34935@indico.fnal.gov
DESCRIPTION:Speakers: Hartmut Wittig (Johannes Gutenberg Universität)\nWe
report on our ongoing project to determine the leading-order\nhadronic va
cuum polarisation contribution to the muon $g-2$\, using\nensembles with $
N_f=2+1$ flavours of O($a$) improved Wilson quarks\ngenerated by the CLS e
ffort\, with pion masses down to the physical\nvalue. We employ O($a$) imp
roved versions of the local and conserved\nvector currents to compute the
contributions of the light\, strange and\ncharm quarks to $(g-2)_\\mu$\, u
sing the time-momentum\nrepresentation. We perform a detailed investigatio
n of the systematic\neffects arising from constraining the long-distance r
egime of the\nvector correlator. To this end we make use of auxiliary calc
ulations\nin the iso-vector channel using distillation and the Lüscher\nf
ormalism. Our results are corrected for finite-volume effects by\ncomputin
g the timelike pion form factor in finite and infinite\nvolume. For certai
n parameter choices\, the corrections computed in\nthis way can also be co
nfronted with results determined on different\nvolumes. Currently\, the ov
erall precision of our results is limited by\nthe uncertainties in the lat
tice scale.\n\nhttps://indico.fnal.gov/event/15949/contributions/34935/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34935/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical Point and Deconfinement in Stochastic Thermal Fields
DTSTART;VALUE=DATE-TIME:20180727T231000Z
DTEND;VALUE=DATE-TIME:20180727T233000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34934@indico.fnal.gov
DESCRIPTION:Speakers: Gennady Kozlov (JINR)\nThe critical phenomena of str
ongly interacting matter are studied in the random fluctuation walk model
at finite temperature. The phase transitions are considered in systems whe
re the Critical Point (CP) is a distinct singular one existence of which i
s dictated by the dynamics of conformal symmetry breaking. \n The phys
ical approach to the effective CP is predicted through the influence fluct
uations of two-particle quantum correlations to which the critical mode co
uples. The finite size scaling effects are used to extract the vicinity of
deconfinement phase transition.\n We obtain the size of the particle
emission source affected by the stochastic forces in thermal medium chara
cterized by the Ginzburg-Landau parameter which is defined by the correlat
ion length of characteristic dual gauge field. The size above mentioned bl
ows up when the temperature approaches the critical value as correlation l
ength becomes large enough.\n The results are the subject to the phys
ical programs at accelerators to search the hadronic matter produced at ex
treme conditions.\n\nhttps://indico.fnal.gov/event/15949/contributions/349
34/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34934/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review on Lattice Muon g-2 HVP Calculation
DTSTART;VALUE=DATE-TIME:20180725T140000Z
DTEND;VALUE=DATE-TIME:20180725T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34933@indico.fnal.gov
DESCRIPTION:Speakers: Kohtaroh Miura (CPT\, Aix-Marseille Universite)\nRec
ent lattice QCD results for hadron vacuum polarization (HVP) and its contr
ibution to muon anomalous magnetic moments (g-2) will be reviewed. There c
urrently exists tension of more than 3-sigma deviations in muon g-2 betwee
n the BNL experiment with 0.5 ppm precision and the Standard Model (SM) pr
ediction with the QCD dispersion relation used for HVP. The lattice QCD pr
edictions without recourse to any experimental inputs provide an independe
nt crosscheck of the dispersive approaches and important indications for a
ssessing the SM prediction with measurements at ongoing/forthcoming experi
ments at Fermilab/JPARC aiming at around 0.1 ppm uncertainty. In this rega
rd\, I overview the lattice QCD challenges for the precise HVP determinati
on and its contribution to muon g-2. In particular\, I focus on the recent
progress made in controling various systematics\, and compare the results
by various lattice groups. I briefly discuss the lattice versus dispersiv
e results and outlook for the per-mil-level determination of the lattice H
VP muon g-2\, which is required by the experiments coming years.\n\nhttps:
//indico.fnal.gov/event/15949/contributions/34933/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating volume effects for Nf=2 twisted clover fermions at t
he physical point
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34932@indico.fnal.gov
DESCRIPTION:Speakers: Colin Lauer (Temple University)\nWe present a study
of volume effects for Nf=2 twisted mass fermions using simulations at the
physical point. The main focus will be given to nucleon quantities such as
the axial charge and quark momentum fraction. The two volumes that we com
pare are 4.5fm and 6 fm\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34932/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wilson Award
DTSTART;VALUE=DATE-TIME:20180725T164500Z
DTEND;VALUE=DATE-TIME:20180725T173000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34931@indico.fnal.gov
DESCRIPTION:Speakers: Zohreh Davoudi (University of Maryland)\nhttps://ind
ico.fnal.gov/event/15949/contributions/34931/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34931/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Public Lecture: Quantum Computing and the Entanglement Frontier
DTSTART;VALUE=DATE-TIME:20180728T010000Z
DTEND;VALUE=DATE-TIME:20180728T023000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34930@indico.fnal.gov
DESCRIPTION:Speakers: John Preskill (Caltech)\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34930/
LOCATION:FRIB Room 1300
URL:https://indico.fnal.gov/event/15949/contributions/34930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous magnetic moment of the muon with dynamical QCD+QED
DTSTART;VALUE=DATE-TIME:20180727T202000Z
DTEND;VALUE=DATE-TIME:20180727T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34929@indico.fnal.gov
DESCRIPTION:Speakers: James Zanotti (University of Adelaide)\nThe QCDSF co
llaboration has generated an ensemble of configurations with dynamical QCD
and QED fields. They are generated with the specific aim of studying flav
our breaking effects arising from differences in the quark masses and char
ges in physical quantities. Here we study these effects in a calculation o
f the anomalous magnetic moment of the muon $a_\\mu=(g-2)/2$ around an SU(
3) symmetric point. Furthermore\, by performing partially quenched simulat
ions we are able to cover a larger range of quark masses and charges on th
ese configurations and then fit the results to an SU(3) flavour breaking e
xpansion. Subsequently\, this allows for an extrapolation to the physical
point.\n\nhttps://indico.fnal.gov/event/15949/contributions/34929/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaon Distribution Amplitude from Lattice QCD and the Flavor SU(3)
Symmetry
DTSTART;VALUE=DATE-TIME:20180724T194000Z
DTEND;VALUE=DATE-TIME:20180724T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34928@indico.fnal.gov
DESCRIPTION:Speakers: Rui Zhang (Institute of Theoretical Physics\, Chines
e Academy of Sciences)\nWe present the first lattice-QCD calculation of th
e kaon distribution amplitude using the large-momentum effective theory (L
aMET) approach. The momentum-smearing technique has been implemented to im
prove signals at large meson momenta. We subtract the power divergence due
to Wilson line to high precision using multiple lattice spacings. The kao
n structure clearly shows an asymmetry of the distribution amplitude aroun
d $x=1/2$\, a clear sign of its skewness. We also study the leading SU(3)
flavor symmetry breaking relations for the pion\, kaon and eta meson distr
ibution amplitudes\, and the results are consistent with the prediction fr
om chiral perturbation theory.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34928/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34928/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bag representation for composite degrees of freedom in lattice gau
ge theories with fermions
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34927@indico.fnal.gov
DESCRIPTION:Speakers: Carlotta Marchis (University of Graz)\nWe explore ne
w representations for lattice gauge theories with fermions\, where the spa
ce time lattice is divided into dynamically fluctuating regions\, inside w
hich different types of degres of freedom are used in the path integral. T
he first kind of regions is a union of so-called bags\, in which the dynam
ics is described by the free propagation of composite degrees of freedom o
f the original fermions. In the second region\, called complementary domai
n\, configurations of the remaining interacting degrees of freedom are use
d to describe the dynamics. We show that for non-abelian gauge groups at s
trong coupling and for abelian gauge groups at arbitrary coupling\, the co
ntribution from each bag can be computed as a determinant when the composi
te degrees of freedom are fermions\, or as a permanent when the composite
degrees of freedom are bosons.\n\nhttps://indico.fnal.gov/event/15949/cont
ributions/34927/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34927/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraint HMC algorithms for gauge-Higgs models
DTSTART;VALUE=DATE-TIME:20180723T221000Z
DTEND;VALUE=DATE-TIME:20180723T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34926@indico.fnal.gov
DESCRIPTION:Speakers: Roman Höllwieser (Bergische Universität Wuppertal)
\nWe present the construction of constraint HMC algorithms for \ngauge-Hi
ggs models in order to measure the effective Higgs potential. \nIn partic
ular we focus on a SU(2) Gauge-Higgs Unification model on a \n5D orbifold
. Previous simulations have identified a region in the \nHiggs phase of t
his model which has properties of a 4D Abelian Higgs \nmodel. We want to
test this relationship by comparing the effective \npotential in both mod
els.\n\nhttps://indico.fnal.gov/event/15949/contributions/34926/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34926/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$Z_\\mathrm{S}/Z_\\mathrm{P}$ from three-flavour lattice QCD
DTSTART;VALUE=DATE-TIME:20180726T145000Z
DTEND;VALUE=DATE-TIME:20180726T151000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34925@indico.fnal.gov
DESCRIPTION:Speakers: Fabian Joswig (Universität Münster)\nWe report on
advances in the non-perturbative determination of the ratio $Z_\\mathrm{S}
/Z_\\mathrm{P}$ of the\nscalar to the pseudoscalar renormalization constan
ts in three-flavour\nlattice QCD with Wilson-clover quarks and tree-level
Symanzik improved\ngluons. The computations are based on the Ward identity
approach\, using\nSchrödinger functional boundary conditions. Our result
s for $Z_\\mathrm{S}/Z_\\mathrm{P}$\ncover a range of couplings along a li
ne of constant physics with lattice\nspacings of about $0.09\\\,$fm and be
low\, relevant for phenomenological\napplications such as the calculation
of renormalized quark masses.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34925/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34925/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange nucleon form factors with $N_f=2+1$ O($a$)-improved Wilson
fermions
DTSTART;VALUE=DATE-TIME:20180725T215000Z
DTEND;VALUE=DATE-TIME:20180725T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34924@indico.fnal.gov
DESCRIPTION:Speakers: Jonas Wilhelm (University of Mainz - Institut for Nu
clear Physics)\nWe present preliminary results for strange form factors of
the nucleon computed on the CLS ensembles with $N_f=2+1$ flavours of O($a
$)-improved Wilson fermions. Our calculations are performed at two values
of the lattice spacing ($a \\in \\{0.064\, 0.086\\} \\\,\\mathrm{fm}$) at
a pion mass of $280 \\\,\\mathrm{MeV}$. The determination of strange form
factors proceeds by computing quark-disconnected diagrams\, for which we e
mploy hierarchical probing in four dimensions\, in order to deal with this
most challenging part of the calculation. Furthermore\, we investigate se
veral source-sink separations to check on excited-state contamination.\n\n
https://indico.fnal.gov/event/15949/contributions/34924/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34924/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond Thimbles: Sign-Optimized Manifolds for Finite Density
DTSTART;VALUE=DATE-TIME:20180723T213000Z
DTEND;VALUE=DATE-TIME:20180723T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34923@indico.fnal.gov
DESCRIPTION:Speakers: Scott Lawrence (University of Maryland\, College Par
k)\nFermionic field theories at finite density suffer from a sign problem\
, making lattice calculations exponentially expensive in the volume. This
sign problem can be reduced or eliminated by complexifying configuration s
pace\, and integrating over a contour deformed from the real plane. We pre
sent an algorithm for determining integration contours with reduced sign p
roblems. We give results from this algorithm for both 1+1 and 2+1 dimensio
nal field theories at finite density.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34923/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34923/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three Dirac operators on two architectures
DTSTART;VALUE=DATE-TIME:20180723T221000Z
DTEND;VALUE=DATE-TIME:20180723T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34922@indico.fnal.gov
DESCRIPTION:Speakers: Stephan DURR (University of Wuppertal)\nA simple min
ded approach to implement three discretizations of the Dirac operator (Bri
llouin\, Wilson\, staggered) on two architectures (KNL and core_i7) is pre
sented. The idea is to use a high-level compiler along with OpenMP paralle
lization and SIMD pragmas\, but to stay away from cache-line optimization
and/or assembly-tuning. The implementation is for Nv right-hand-sides\, an
d this extra index is used to fill the SIMD pipeline. On one KNL node sing
le precision performance figures for Nc=3\, Nv=12 read 640 Gflop/s\, 320 G
flop/s\, and 520 Gflop/s for the three discretization schemes\, respective
ly.\n\nhttps://indico.fnal.gov/event/15949/contributions/34922/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34922/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent Developments in x-dependent Structure Calculations
DTSTART;VALUE=DATE-TIME:20180727T160000Z
DTEND;VALUE=DATE-TIME:20180727T164500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34921@indico.fnal.gov
DESCRIPTION:Speakers: Christopher Monahan (University of Washington)\nFirs
t principles calculations of the Bjorken-x dependence of hadron structure
have been a long-standing challenge for lattice QCD. This year marks a sig
nificant milestone: the first determinations of parton distribution functi
ons\, which capture the longitudinal momentum structure of fast-moving had
rons\, at physical pion masses. Moreover\, there has been significant prog
ress in our understanding of the theoretical frameworks underpinning these
calculations\, although not all sources of systematic uncertainty have be
en fully explored. I review the various approaches to extracting x-depende
nt hadron structure from lattice QCD and highlight recent results in both
the meson and baryon sectors.\n\nhttps://indico.fnal.gov/event/15949/contr
ibutions/34921/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34921/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine learning for multi-scale action matching
DTSTART;VALUE=DATE-TIME:20180724T213000Z
DTEND;VALUE=DATE-TIME:20180724T215000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34920@indico.fnal.gov
DESCRIPTION:Speakers: Phiala Shanahan (Massachusetts Institute of Technolo
gy)\nCritical slowing-down of HMC algorithms presents a significant challe
nge in achieving LQCD calculations at fine lattice spacings. A number of m
ethods have been proposed that circumvent this issue by acting at multiple
physical length scales\, including perfect actions that aim to achieve al
most-continuum physics at finite lattice spacings\, and multi-scale therma
lisation techniques. Such approaches require careful renormalisation-group
matching of the LQCD actions defined at different scales such that they d
escribe the same long-distance physics. An essential challenge is to solve
the parametric regression task: Which action parameters best represent th
e coarse-scale physics of an ensemble of samples generated at a finer reso
lution\, and vice-versa? Similar parameter regression problems of LQCD ens
embles arise in the context of mixed-action LQCD simulations. I will discu
ss the applicability of machine learning to this regression task. Deep neu
ral networks are found to provide an efficient solution even in cases wher
e approaches such as principal component analysis fail. The high informati
on content and complex symmetries inherent in lattice QCD datasets require
custom neural network layers to be introduced and present opportunities f
or further development.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34920/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34920/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isovector and flavor diagonal charges of the nucleon
DTSTART;VALUE=DATE-TIME:20180726T174000Z
DTEND;VALUE=DATE-TIME:20180726T180000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34919@indico.fnal.gov
DESCRIPTION:Speakers: Rajan Gupta (Los Alamos National Lab)\nI will presen
t results from the PNDME collaboration for the\nisovector and flavor diago
nal charges of the nucleon obtained using\neleven 2+1+1-flavor HISQ ensemb
les generated by the MILC collaboration. \nThe talk will also cover
Details of the control over excited states and the\nthe chiral-continuum-f
inite volume fits leading to teh final results.\n\nhttps://indico.fn
al.gov/event/15949/contributions/34919/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34919/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic spectrum calculations in the quark-gluon plasma
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34918@indico.fnal.gov
DESCRIPTION:Speakers: Jonas Glesaaen (Swansea University)\nAlthough the ge
neral behaviour of the crossover of QCD into the quark-gluon plasma phase
at zero chemical potential is fairly well understood\, the question of wha
t exactly happens to the bound states of the theory in the crossover regio
n is still not fully answered. In this talk the continuation of the FASTSU
M collaboration's investigation of hadrons in the region of $T_c$ will be
presented. The study has been extended towards lighter quark masses with o
ur anisotropic Gen2L ensembles with pion masses of 236 MeV. A publicly ava
ilable extension of the openQCD software which incorporates anisotropic la
ttices and stout smearing among other improvements will also be announced.
\n\nhttps://indico.fnal.gov/event/15949/contributions/34918/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34918/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light and strange quark masses for $N_f = 2 + 1$ simulations with
Wilson fermions
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34917@indico.fnal.gov
DESCRIPTION:Speakers: Jonna Koponen (INFN sezione di Roma Tor Vergata)\nWe
present a preliminary analysis of the $u/d$ and $s$ quark masses\, extrac
ted using the PCAC quark masses reported in Phys. Rev. D 95\, 074504. The
data is based on the CLS $N_f = 2 + 1$ simulations with Wilson/Clover quar
ks and Luescher-Weisz gauge action\, at four $\\beta$ values (i.e. lattice
spacings) and a range of quark masses. We use the Alpha results of Eur.Ph
ys.J. C78 (2018)387 for non-perturbative quark mass renormalisation and RG
-running from hadronic to electroweak scales in the Schroedinger Functiona
l scheme. Quark masses are quoted both in the $\\overline{MS}$ scheme and
as RGI quantities.\n\nhttps://indico.fnal.gov/event/15949/contributions/34
917/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34917/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semi-leptonic form factors for Bs -> K l nu and Bs -> Ds l nu
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34916@indico.fnal.gov
DESCRIPTION:Speakers: Oliver Witzel Witzel (University of Colorado Boulder
)\nWe report on our determination of form factors for Bs semi-leptonic dec
ays and extract ratios to investigate lepton flavor universality violation
s. Our calculation is based on RBC-UKQCD's gauge field ensembles featuring
2+1 flavors of domain-wall fermions and Iwasaki gauge action at three lat
tice spacing of 1/a = 1.78\, 2.38\, and 2.77 GeV. In the valence sector we
use domain-wall light\, strange\, and charm quarks and simulate physical
bottom quarks using the relativistic heavy quark action. We will detail ou
r new analysis procedure and give an outlook on future calculations.\n\nht
tps://indico.fnal.gov/event/15949/contributions/34916/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34916/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards non-perturbative renormalization of $\\Delta S = 1$ four-q
uark operators with a position-space procedure
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34915@indico.fnal.gov
DESCRIPTION:Speakers: Masaaki Tomii (Columbia University)\nWe construct a
concrete strategy to implement the non-perturbative renormalization of the
$\\Delta S = 1$ four-quark operators\, which are associated with $K \\to
\\pi\\pi$ matrix elements. These non-perturbative methods can be used to d
etermine the Wilson coefficients for the 3-flavor theory\, avoiding a sign
ificant source of systematic uncertainty that arises from perturbative mat
ching through the charm threshold. The use of an on-shell\, gauge-invaria
nt\, position-space scheme is important below the charm threshold to avoid
any mixing with irrelevant operators which becomes a serious problem when
the RI/MOM scheme is used at low energies. In this talk\, we provide a r
enormalization condition in the position-space procedure which is applicab
le even if operators mix with each other. A new treatment of discretizatio
n errors based on the idea of averaging correlators over spheres is introd
uced with an example of quark mass renormalization\, which can be compared
with our previous result from the RI/SMOM scheme.\n\nhttps://indico.fnal.
gov/event/15949/contributions/34915/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34915/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review on Composite Higgs Models
DTSTART;VALUE=DATE-TIME:20180724T143000Z
DTEND;VALUE=DATE-TIME:20180724T151500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34914@indico.fnal.gov
DESCRIPTION:Speakers: Oliver Witzel Witzel (University of Colorado Boulder
)\nComposite Higgs Models explore the possibility that the Higgs boson is
an excitation of a new strongly interacting sector giving rise to electro-
weak symmetry breaking. After describing how this new sector can be embedd
ed into the Standard Model of elementary particle physics meeting experime
ntal constraints\, I will review efforts by the community to explore the p
hysics of this new strong interactions using methods of lattice field theo
ry. Challenges in understanding the numerical results are discussed and an
outlook is given on possible future directions allowing to confirm or rej
ect the composite Higgs hypothesis.\n\nhttps://indico.fnal.gov/event/15949
/contributions/34914/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34914/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Split Grid and Block Lanczos algorithm for efficient eigenpair gen
eration
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34913@indico.fnal.gov
DESCRIPTION:Speakers: Chulwoo Jung (Brookhaven National Laboratory)\nThe i
ncreasing unbalance between computing capabilities of individual\nnodes an
d internode communication makes it highly desirable for any\nLattice QCD a
lgorithm to minimize the amount of off-node communication.\nOne of the rel
atively new methods for this is the 'split-grid' or\n'split-domain'\, wher
e data is rearranged within the running of a single binary\,\n so that the
routines which requires significant off-node communications such\nas Dira
c operators are run on multiple smaller partitions in parallel\nwith a bet
ter surface to volume ratio\,\nwhile other routines are run in one large p
artition.\n\nWhile it is relatively straightforward to utilize split-grid
for\ninverters\, the typical\nLanczos algorithm which has one starting vec
tor does not render itself\nnaturally to split-grid approach. Here we repo
rt on our investigation of Block\nLanczos algorithm which allows multiple
starting vectors to be concurrently.\nIt is shown that for a moderate numb
er of starting vectors\, Block\nLanczos algorithm has been implemented in
Grid Data parallel C++ mathematical object library\, and shown to achieve
convergence comparable to normal Lanczos algorithm on\nDWF/Mobius ensemble
with physical quark masses.\n\nhttps://indico.fnal.gov/event/15949/contri
butions/34913/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34913/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on modern GPU systems
DTSTART;VALUE=DATE-TIME:20180728T144500Z
DTEND;VALUE=DATE-TIME:20180728T151500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34912@indico.fnal.gov
DESCRIPTION:Speakers: Mathias Wagner (NVIDIA)\nIn the 10 years since the c
reation of the QUDA library for Lattice QCD on NVIDIA GPUs the hardware an
d software features of GPU systems have evolved dramatically. Not only has
the raw Dslash kernel performance on a single GPU improved by more than o
ne order of magnitude but also modern GPUs are often deployed in "Fat Node
s" with up to 8 GPUs. We report on the techniques that QUDA implements to
achieve high performance on these modern GPU architecture by exploiting th
e features of modern NVIDIA GPUs\, like Unified Memory\, GPU Direct and NV
Link-connections between GPUs and to IBM Power CPUs. We discuss the impact
of these optimizations and present scaling results for QUDA on DGX-1 base
d clusters and Summit. Finally\, we will give an outlook on future directi
ons. In particular we preview strong scaling and programmability improveme
nts by using NVSHMEM\, an OpenSHMEM implementation for GPUs as well as QUD
A on NVSwitch-based systems like DGX-2 with 16 fully interconnected GPUs.\
n\nhttps://indico.fnal.gov/event/15949/contributions/34912/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34912/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New lattice interaction and the spectrum of light and medium mass
nuclei
DTSTART;VALUE=DATE-TIME:20180724T200000Z
DTEND;VALUE=DATE-TIME:20180724T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34911@indico.fnal.gov
DESCRIPTION:Speakers: Ning Li (NSCL/FRIB\, Michigan State University)\nWe
present a new lattice formulation of chiral effective nuclear force with s
impler\n decomposition into partial waves. With these new interactions the
process of fitting \nto the empirical-observed scattering phase shifts is
simplified\, and the resulting \nlattice phase shifts are more accurate t
han those in precious studies. We present results \nfor neutron-proton sys
tem up to next-to-next-to-next-to-leading order with lattice spacings of 1
.97 fm\, 1.64fm\, 1.32fm and 0.99fm. We also present the new lattice resul
ts for the spectrum of the light and medium mass nuclei calculated with th
ese new interactions\n\nhttps://indico.fnal.gov/event/15949/contributions/
34911/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34911/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on the study of electromagnetic corrections to $K\\to\\pi
\\pi$ decay
DTSTART;VALUE=DATE-TIME:20180726T172000Z
DTEND;VALUE=DATE-TIME:20180726T174000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34910@indico.fnal.gov
DESCRIPTION:Speakers: Xu Feng (Peking University)\nIn this talk\, we prese
nt our progress on the study of the electromagnetic corrections to $K\\to\
\pi\\pi$ decay. To provide an accurate Standard-Model determination of dir
ect CP violation at the precision of O(10%)\, it is important to include t
he electromagnetic corrections\, as such $O(\\alpha_e)$ effects could be e
nhanced 22 times in principle due to the isospin mixing and the $\\Delta I
=1/2$ rule. On the other hand\, the long-range electromagnetic interaction
is inconsistent with the Luscher and the Lellouch-Luscher finite-volume f
ormalisms. Different from the traditional infrared regulators introduced a
s $QED_L$\, massive photon or $C^*$ boundary condition\, here we propose t
o use a truncated range as a new infrared regulator\, which allows us to u
se the available finite-volume formalisms directly. To remove the unphysic
al truncation effects\, we then provide the relations to connect the trunc
ated quantities to the physical ones. Some other aspects of the electromag
netic corrections are also discussed.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34910/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34910/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axial U(1) symmetry and Dirac spectra in high-temperature phase of
$N_f=2$ lattice QCD
DTSTART;VALUE=DATE-TIME:20180724T190000Z
DTEND;VALUE=DATE-TIME:20180724T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34909@indico.fnal.gov
DESCRIPTION:Speakers: Kei Suzuki (KEK)\nWe investigate the axial $U(1)$ sy
mmetry in the phase above the critical temperature in $N_f=2$ lattice QCD\
, where the ensembles are generated with Mobius domain-wall fermions\, and
the overlap/domain-wall reweighting is applied. We show the $U(1)_A$ susc
eptibility extracted from the spectra of the overlap Dirac eigenmodes and
discuss its temperature\, quark-mass\, and spatial volume dependence. The
behavior of $U(1)_A$ susceptibility is compared with that of topological s
usceptibility and their relation is discussed.\n\nhttps://indico.fnal.gov/
event/15949/contributions/34909/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34909/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$K \\pi$ scattering and the $K^*(892)$ resonance in 2+1 flavor QCD
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34908@indico.fnal.gov
DESCRIPTION:Speakers: Jesus Gumaro Rendon Suzuki (University of Arizona)\n
In this project\, we aim to compute the form factors relevant for $B \\to
K^*(\\to K \\pi)\\ell^+\\ell^-$ decays. To map the finite-volume matrix el
ements computed on the lattice to the infinite-volume $B \\to K \\pi$ matr
ix elements\, the $K \\pi$ scattering amplitude needs to be determined usi
ng L\\"uscher's method. Here we present preliminary results from a calcula
tion with $2+1$ flavors of dynamical clover fermions\, on a $32^3 \\times
96$ lattice with $a=0.1140(8)$ fm and $m_{\\pi}=317(3)$ MeV.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34908/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34908/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Path Optimization Method with Use of Neural Network for the Sign P
roblem in Field Theories
DTSTART;VALUE=DATE-TIME:20180728T161500Z
DTEND;VALUE=DATE-TIME:20180728T164500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34907@indico.fnal.gov
DESCRIPTION:Speakers: Akira Ohnishi (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\nWe introduce the feedforward neural network in th
e path optimization method (POM) to evade the sign problem in field theori
es. POM is based on the complexification of integral variables as in the c
omplex Langevin method and the Lefschetz thimble method. The integration p
ath is optimized in the complexified variable space by maximizing the aver
age phase factor. In the last Lattice meeting [1] and in Ref.[2]\, we have
demonstrated that POM works very well in a one-dimensional model: Setting
the integration path by a simple function and optimization by the standar
d gradient method provide an almost perfect integration path even in the i
ntegral with a severe sign problem. In field theories\, however\, it is no
t easy to prepare and optimize the integration path in the complex space.
We introduce the neural network\, a kind of machine learning\, in POM to i
nvestigate the sign problem in field theory [3]. As demonstrated in the la
st Lattice meeting [1] and followed by Alexandru et al. [4]\, the machine
learning technique seems to be powerful in applying POM to the sign proble
m. We demonstrate that POM with the neural network optimization works well
in $\\lambda\\phi^4$ theory at finite chemical potential: The average pha
se factor becomes well above zero and we can safely obtain the expectation
value of observables [3]. The optimized path shows that the imaginary par
t of integration variable is strongly correlated with the real part of the
nearest neighbor site\, as discussed in Ref. [5]. We also plan to discuss
the results of applying POM with the neural network to a gauge theory.\n\
n[1] A. Ohnishi\, Y. Mori\, K. Kashiwa\, Lattice 2017 proceedings\, EPJ We
b Conf. 175 (2018)\, 07043.\n\n[2] Y. Mori\, K. Kashiwa\, A. Ohnishi\, Phy
s. Rev. D 96 (2017)\, 111501(R).\n\n[3] Y. Mori\, K. Kashiwa\, A. Ohnishi\
, Prog. Theor. Exp. Phys. 2018 (2018)\, 023B04.\n\n[4] A. Alexandru et al.
\, Phys. Rev. D97 (2018)\, 094510.\n\n[5] F. Bursa\, M. Kroyter\, arXiv:18
05.04941.\n\nhttps://indico.fnal.gov/event/15949/contributions/34907/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34907/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the definition of schemes for computing leading order isospin b
reaking corrections
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34906@indico.fnal.gov
DESCRIPTION:Speakers: Andrea Bussone (IFT\, UAM-CSIC)\nWe propose a partic
ular 'line of constant physics' (i.e.\, a scheme) for computing isospin br
eaking corrections to hadronic quantities. We show this scheme is in a cl
ass of schemes that allow for the separation of the electromagnetic and st
rong isospin breaking corrections at leading order\, such that scheme-ambi
guities are higher order in isospin breaking effects.\n\nhttps://indico.fn
al.gov/event/15949/contributions/34906/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34906/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relations between scattering amplitude and Bethe-Salpeter wave fun
ction in quantum field theory
DTSTART;VALUE=DATE-TIME:20180726T162000Z
DTEND;VALUE=DATE-TIME:20180726T164000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34905@indico.fnal.gov
DESCRIPTION:Speakers: Takeshi Yamazaki (Univerity of Tsukuba)\nWe discuss
an exact relation between the two-particle scattering amplitude and the Be
the-Salpeter (BS) wave function inside the interaction range in quantum fi
eld theory. In the relation the reduced BS wave function given by the BS w
ave function plays an essential role. Through the relation the on-shell an
d half off-shell amplitudes can be calculated.\nWe also show that the solu
tion of Schrodinger equation with the effective potential determined from
the BS wave function gives a correct on-shell scattering amplitude only at
the momentum where the effective potential is calculated.\n\nhttps://indi
co.fnal.gov/event/15949/contributions/34905/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34905/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flavor anomalies & the lattice
DTSTART;VALUE=DATE-TIME:20180727T231000Z
DTEND;VALUE=DATE-TIME:20180727T233000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34904@indico.fnal.gov
DESCRIPTION:Speakers: Amarjit Soni (BNL)\nIn the past few years several ob
servables are indicating deviations from the SM amounting to a few sigmas.
In view of the experimental developments on the horizon and bearing in m
ind recent advances in matrix elements calculations\, in this talk I will
discuss ways in which lattice methods may be used to improve precision in
the predictions of the SM so that the experimental data can be used more e
ffectively and reliably to test the SM.\n\nhttps://indico.fnal.gov/event/1
5949/contributions/34904/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34904/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equation of state in 2 + 1 flavor QCD at high temperatures
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34903@indico.fnal.gov
DESCRIPTION:Speakers: Johannes Heinrich Weber (Michigan State University)\
nWe calculate the equation of state at high temperatures in 2+1 flavor QCD
using the highly improved staggered quark (HISQ) action. We study the lat
tice spacing dependence of the pressure at high temperatures using lattice
s with temporal extent (N_\\tau= 6\,\\ 8\,\\ 10) and (12) and perform cont
inuum extrapolations.\nWe also give a continuum estimate for the equation
of state up to temperatures (T = 2) GeV\, which are then compared with res
ults of the weak-coupling calculations. We find a reasonably good agreemen
t with the weak-coupling calculations at the highest temperatures.\n\nhttp
s://indico.fnal.gov/event/15949/contributions/34903/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34903/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the P-wave nucleon-pion scattering amplitude in the $\\Del
ta$ (1232) channel: Phase shift analysis
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34691@indico.fnal.gov
DESCRIPTION:Speakers: SRIJIT PAUL (The Cyprus Institute)\nThe study of str
ong scattering in Lattice QCD is enabled by the use of\nthe Luescher metho
d\, which defines a mapping between the two body\nspectrum in the finite v
olume and the infinite volume scattering\namplitude.This talk focuses on t
he study of $\\pi N$ scattering in $P$-wave and $I=\\frac{3}{2}$\, where t
he $\\Delta$ resonance resides. We use $N_f=2+1$ flavors of tree-level imp
roved Wilson-clover quarks corresponding to a pion mass of $\\sim 250$ MeV
with lattice size $3.7$ fm\, where $\\Delta$ is unstable. We aim to discu
ss the mapping of energy levels to scattering phase shifts.\n\nhttps://ind
ico.fnal.gov/event/15949/contributions/34691/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34691/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to \\pi \\ell \\nu$ and $B \\to \\pi\\ell\\ell$ decays with H
ISQ/NRQCD valence quarks on $N_f=2+1$ asqtad ensembles.
DTSTART;VALUE=DATE-TIME:20180727T215000Z
DTEND;VALUE=DATE-TIME:20180727T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34690@indico.fnal.gov
DESCRIPTION:Speakers: Christopher Bouchard (Ohio State)\nWe discuss a calc
ulation of the form factors for the flavor-changing charged current $b\\to
u$ and the flavor-changing neutral current $b\\to d$ semileptonic decays\
, $B\\to \\pi\\ell\\nu$ and $B\\to\\pi\\ell\\ell$. HISQ light and NRQCD $
b$ valence quarks are simulated on the MILC $N_f=2+1$ asqtad ensembles\, i
ncluding pion momenta that cover the full kinematic range of the decay. T
hese data are analyzed using a hard pion ChPT motivated modified z-expansi
on developed in previous work. Preliminary results and phenomenological i
mplications are discussed.\n\nhttps://indico.fnal.gov/event/15949/contribu
tions/34690/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34690/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On chiral extrapolations of charmed meson masses and coupled-chann
el reaction dynamics
DTSTART;VALUE=DATE-TIME:20180727T200000Z
DTEND;VALUE=DATE-TIME:20180727T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34689@indico.fnal.gov
DESCRIPTION:Speakers: Xiao-Yu Guo (GSI Helmholzzentrum)\nWe perform an ana
lysis of QCD lattice data on charmed meson masses. The quark-mass dependen
ce of the data set is used to gain information on the size of counter term
s of the chiral Lagrangian formulated with open-charm states with $J^P = 0
^-$ and $J^P = 1^-$ quantum numbers. Of particular interest are those coun
ter terms that are active in the exotic flavour sextet channel. A chiral e
xpansion scheme where physical masses enter the extrapolation formulae is
developed and applied to the lattice data set. Good convergence properties
are demonstrated and an accurate reproduction of the lattice data based o
n ensembles of PACS-CS\, MILC\, HPQCD\, ETMC and HSC with pion and kaon ma
sses smaller than 600 MeV is achieved. It is argued that a unique set of l
ow-energy parameters is obtainable only if additional information from HSC
on some scattering observables is included in our global fits. The elasti
c and inelastic s-wave $\\pi D$ and $\\eta D$ scattering as considered by
HSC is reproduced faithfully. Based on such low-energy parameters we predi
ct 15 phase shifts and in-elasticities at physical quark masses but also f
or an additional HSC ensemble at smaller pion mass. In addition we find a
clear signal for a member of the exotic flavour sextet states in the $\\et
a D$ channel\, below the $\\bar K D_s$ threshold. For the isospin violatin
g strong decay width of the $D_{s0}(2317)$ we obtain the range (104 − 11
6) keV.\n\nhttps://indico.fnal.gov/event/15949/contributions/34689/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:nEDM from BSM
DTSTART;VALUE=DATE-TIME:20180723T194000Z
DTEND;VALUE=DATE-TIME:20180723T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34688@indico.fnal.gov
DESCRIPTION:Speakers: Tanmoy Bhattacharya (Los Alamos National Laboratory)
\nI will present an update on our calculations of nEDM due to the quark an
d gluon chromo-EDM operators\, as well as the QCD Theta-term with which th
ese mix. The calculations are being done by extrapolating to zero momentu
m transfer the F3 form factor of a vector current calculated using valence
and disconnected Wilson-clover quarks on HISQ background configurations g
enerate by the MILC collaboration.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34688/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34688/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Confront the lattice finite-volume energy levels with chiral effec
tive field theory
DTSTART;VALUE=DATE-TIME:20180724T194000Z
DTEND;VALUE=DATE-TIME:20180724T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34687@indico.fnal.gov
DESCRIPTION:Speakers: Zhihui Guo (Hebei Normal University)\nIn this talk\,
we will introduce the finite-volume effects in the chiral effective field
theory and analyse the lattice finite-volume energy levels to extract the
resonance properties with the unphysical and physical pion masses. Specia
l attention will be paid to the a0(980) from the coupled-channel scatterin
g of pi-eta\, K-Kbar and pi-eta'. Preliminary results on the D-pi\, Ds-Kba
r and D-eta scattering will be also presented. \n\nA global fit to recent
lattice finite-volume energy levels from pi-eta scattering and relevant e
xperimental data on a pi-eta event distribution and the gamma-gamma -> pi-
eta cross section is performed. Both the leading and next-to-leading-order
analyses lead to similar and successful descriptions of the finite-volume
energy levels and the experimental data. However\, these two different an
alyses yield different pi-eta scattering phase shifts for the physical mas
ses for the pi\, K\, eta and eta' mesons. The inelasticities\, the pole po
sitions in the complex energy plane and their residues are calculated both
for unphysical and physical meson masses.\n\nhttps://indico.fnal.gov/even
t/15949/contributions/34687/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34687/
END:VEVENT
BEGIN:VEVENT
SUMMARY:D meson semileptonic decay form factors at $q^2 = 0$
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34686@indico.fnal.gov
DESCRIPTION:Speakers: Ruizi Li (Indiana University)\nWe calculate $D \\rig
htarrow Kl\\nu\, \\pi l\\nu$ vector form factors $f_+^{K/\\pi}$ at zero-mo
mentum transfer\, using MILC's $N_f = 2+1+1$ HISQ ensembles at four lattic
e spacings\, $a \\approx 0.042\, 0.06\, 0.09\, 0.12$ fm\, and various HISQ
quark masses down to the (degenerate) physical light quark mass. We use t
he kinematic constraint $f_+= f_0$ at $q^2 = 0$ to determine the vector fo
rm factor from our study of the scalar current which yields $f_0$. We use
hard pion/kaon SU(3) heavy-meson-staggered $\\chi$PT and Symanzik effectiv
e theory to fit the data and extrapolate the form factors to the physical
point. We improve the precision achieved in existing lattice calculations
of the vector form factors at $q^2=0$. We also determine the CKM matrix el
ements $|V_{cs}|$\, $|V_{cd}|$ using recent experimental results and test
second row unitarity.\n\nhttps://indico.fnal.gov/event/15949/contributions
/34686/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34686/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Structure of pion and kaon from lattice QCD
DTSTART;VALUE=DATE-TIME:20180724T192000Z
DTEND;VALUE=DATE-TIME:20180724T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34685@indico.fnal.gov
DESCRIPTION:Speakers: Bipasha Chakraborty (Jefferson Lab)\nDirect lattice
computation of the key measures of hadron structure such as the form facto
rs\, parton distribution functions\, quark distribution amplitudes have al
ways been challenging. With current enormous experimental efforts at JLab
(with its 12 GeV upgrade)\, COMPASS in CERN\, RHIC-spin and at a future EI
C\, it is now crucial to test and exploit the newly proposed lattice QCD i
deas in hadron structure which requires increasingly high momenta. In this
talk\, I will discuss our recent progresses in pion/kaon structure calcul
ations using lattice QCD. In particular\, I will describe our progress at
understanding the valence quark distributions of the kaon using configurat
ion-space separated gauge-invariant hadronic currents following a recent t
heoretical development [Phys.Rev.Lett. 120 (2018) no.2\, 022003]. I will a
lso briefly discuss our alternative approach using method of distillation
to reach higher moemnta in simpler hadronic quantities such as pion electr
omagnetic form factor.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34685/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34685/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor network study of two dimensional lattice $\\phi^{4}$ theory
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34684@indico.fnal.gov
DESCRIPTION:Speakers: Ryo Sakai (Kanazawa University)\nThe tensor renormal
ization group attracts great attention as a new numerical method because i
t is free of the sign problem. In addition to this striking feature\, it h
as also an attractive aspect as a coarse-graining of space-time\; that is
to say\, the computational cost scales logarithmically with the space-time
volume. This fact allows us to aggressively approach the thermodynamic li
mit. While taking this advantage\, we study the critical coupling in the c
ontinuum limit of the two dimensional lattice $\\phi^{4}$ theory. We prese
nt the numerical results along with the extrapolation procedure to the con
tinuum limit\, and compare them with the previous ones by Monte Carlo simu
lations and other tensor network schemes.\n\nhttps://indico.fnal.gov/event
/15949/contributions/34684/
LOCATION:Kellogg Hotel and Conference Center 107
URL:https://indico.fnal.gov/event/15949/contributions/34684/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of HVP calculation by RBC/UKQCD
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34683@indico.fnal.gov
DESCRIPTION:Speakers: Christoph Lehner (BNL)\nI present the current status
of the HVP calculation for the muon anomalous magnetic moment by the RBC
and UKQCD collaborations both for a pure lattice and a combined lattice+R-
ratio calculation. I will report on our recent work [1801.07224] and on p
rogress towards the reduction of statistical and systematic uncertainties.
\n\nhttps://indico.fnal.gov/event/15949/contributions/34683/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34683/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin for Lattice QCD
DTSTART;VALUE=DATE-TIME:20180723T190000Z
DTEND;VALUE=DATE-TIME:20180723T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34682@indico.fnal.gov
DESCRIPTION:Speakers: Donald Sinclair (Argonne National Laboratory)\nWe ar
e applying complex-Langevin simulations to lattice QCD at finite \nquark-n
umber chemical potential $\\mu$ and zero temperature. While we observe\nso
me improvement as we move to weaker coupling we only find agreement with t
he\nexpected physics at very small and at large $\\mu$. It has been observ
ed by\nothers that at least part of the problem is that at small and even
zero $\\mu$\nthe gauge fields show large departures from the $SU(3)$ manif
old. We are\ntherefore quantifying how these departures depend on the size
of the gauge \ncoupling and the quark mass. It appears that these departu
res decrease as we\nmove to weaker couplings and to smaller quark masses.
One might ask whether \nthis means that the complex Langevin will produce
correct results in the \ncontinuum limit.\n\nWe are also extending our sim
ulations to finite $\\mu$ and temperature where\nit is believed that the c
omplex Langevin should be better behaved.\n\nhttps://indico.fnal.gov/event
/15949/contributions/34682/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34682/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Visualizations of Centre Vortex Structure in Lattice Simulations
DTSTART;VALUE=DATE-TIME:20180724T211000Z
DTEND;VALUE=DATE-TIME:20180724T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34681@indico.fnal.gov
DESCRIPTION:Speakers: Derek Leinweber (CSSM\, University of Adelaide)\nThi
s presentation examines the structure of centre vortices in Monte-Carlo ge
nerated gauge-field configurations using modern visualization techniques.
We'll begin with a brief review of how centre vortices underpin dynamical
chiral symmetry breaking and how their removal restores chiral symmetry.\
n\nCentre vortices are identified through gauge transformations maximizing
the centre of the gauge group. Focusing on the thin vortices identified
by Wilson loops having a non-trivial centre phase\, the vortex structure i
s illustrated through renderings of oriented spatial plaquettes. Time ori
ented plaquettes are illustrated by identifying spatial links associated w
ith these non-trivial plaquettes.\n\nOf particular interest is the correla
tion of the vortex structure and the topological-charge structure of the g
auge fields\, vital to dynamical chiral symmetry breaking and its associat
ed mass generation. The results provide new insights into the role of cen
tre vortices in underpinning non-trivial topology in gauge fields. They re
veal how the removal of centre-vortices necessarily destroys non-trivial t
opology\, immediately restoring chiral symmetry and destabilizing would-be
instantons under smoothing algorithms. In contrast\, vortex-only backgro
unds provide gauge-field degrees of freedom sufficient to create instanton
s upon smoothing.\n\nThe observed correlations further strengthen the idea
that centre vortices are the seeds of dynamical chiral symmetry breaking.
\n\nhttps://indico.fnal.gov/event/15949/contributions/34681/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34681/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SMOM - $\\overline{\\mbox{MS}}$ Matching for $B_K$ at Two-loop Ord
er
DTSTART;VALUE=DATE-TIME:20180726T135000Z
DTEND;VALUE=DATE-TIME:20180726T141000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34680@indico.fnal.gov
DESCRIPTION:Speakers: Sandra Kvedaraite (University of Sussex)\nThe Kaon b
ag parameter\, $B_K$\, is a key non-perturbative ingredient in the search
for new physics through CP-violation. It parameterizes the QCD hadronic ma
trix element of the effective weak $\\Delta S=2$ four quark operator which
can only be computed non-pertubatively on the lattice. The perturbative m
atching of $B_K$ between the lattice renormalization schemes and $\\overli
ne{\\mbox{MS}}$ scheme has been done before at one-loop order. In this tal
k I am going to present a calculation of the conversion factors for $B_K$
between the four non-exceptional RI-SMOM schemes and the $\\overline{\\mbo
x{MS}}$ scheme at two-loop order in pertubation theory. The calculation is
performed using the loop integral solving techniques such as integration
by parts and sector decomposition.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34680/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34680/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics for SU(2) pure gauge theory using gradient flow
DTSTART;VALUE=DATE-TIME:20180726T143000Z
DTEND;VALUE=DATE-TIME:20180726T145000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34679@indico.fnal.gov
DESCRIPTION:Speakers: Takehiro Hirakida (Kyushu University)\nWe present la
ttice calculations of the equation of state of pure SU(2) gauge theory by
using the gradient flow. The scale-setting of lattice parameter has been c
arried\, and we propose a reference scale t0 satisfying t2E=0.1 for SU(2)
gauge theory. This reference value is fixed by a natural scaling-down of t
he t0 scale for the SU(3) based on perturbative analysis. We also show the
thermodynamic quantities as a function of T/Tc\, which are derived by the
energy-momentum tensor using the small flow-time expansion.\n\nhttps://in
dico.fnal.gov/event/15949/contributions/34679/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34679/
END:VEVENT
BEGIN:VEVENT
SUMMARY:PDFs in small boxes
DTSTART;VALUE=DATE-TIME:20180725T190000Z
DTEND;VALUE=DATE-TIME:20180725T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34678@indico.fnal.gov
DESCRIPTION:Speakers: Guerrero Juan (Hampton University/Jefferson Lab)\nIt
has been recently proposed that PDFs can be studied directly using lattic
e QCD. Such studies require the evaluation of matrix of non-local operator
s. Since this was first proposed\, there has been an intense investigation
of all possible systematics except for the effects associated with the fa
ct that lattice QCD is necessarily defined in a finite spacetime. In this
talk\, I present the first attempt to assess these systematics\, and I sho
w that these matrix elements might suffer of large finite-volume artifacts
.\n\nhttps://indico.fnal.gov/event/15949/contributions/34678/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34678/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD codes on Taihu-Light
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34677@indico.fnal.gov
DESCRIPTION:Speakers: Ming Gong ()\nWe are developing a code package for t
he supercomputer Shenwei Taihu-Light in China. There is an optimized D-sla
sh function and some inverter functions in the code pacakge. We will show
the working progress of this project.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34677/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34677/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strong Decay Analysis of Bottom Mesons
DTSTART;VALUE=DATE-TIME:20180724T202000Z
DTEND;VALUE=DATE-TIME:20180724T204000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34676@indico.fnal.gov
DESCRIPTION:Speakers: Pallavi Gupta (Thapar University)\nIn the last decad
e\, a significant experimental progress has been achieved in studying the
heavy-light meson spectroscopy. Heavy-light mesons composed of\none heavy
quark Q and a light quark q are useful in understanding the strong interac
tions in the non perturbative regime. Experiments like LHCb\, Babar etc ar
e providing many new states which are being added to their spectroscopy. B
ut the information for higher excited bottom mesons is rather limited as c
ompared to the charm mesons. In this\, we study the experimentally missing
radially excited (n=2) bottom mesons. We study their two body strong deca
ys\, coupling constants and branching ratios with the emission of light ps
eudo-scalar mesons (η\,K\,π) in the framework of HQET which can be confr
onted with the future experimental data.\n\nhttps://indico.fnal.gov/event/
15949/contributions/34676/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34676/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The critical endpoint in the 2-d U(1) gauge-Higgs model at topolog
ical angle $\\theta=\\pi$
DTSTART;VALUE=DATE-TIME:20180725T194000Z
DTEND;VALUE=DATE-TIME:20180725T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34675@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Goeschl (University of Graz)\nWe investigate
the phase structure of the 2-d U(1) gauge-Higgs model at non-vanishing top
ological angle $\\theta$. The sign problem arising from the topological te
rm is avoided by invoking a dual representation of the gauge-Higgs model.
This allows us to observe a 1st order transition in the topological charge
at the symmetrical point $\\theta=\\pi$. By using the Villain action to d
iscretize the gauge field dynamics\, we implement the corresponding symmet
ry as an exact $Z_2$ symmetry of the dual variables. \nWe perform simulat
ions to determine the critical endpoint of this transition as a function o
f the mass parameter and\, using FSS techniques\, show that it falls into
the universality class of the 2-d Ising model.\n\nhttps://indico.fnal.gov/
event/15949/contributions/34675/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34675/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark mass determinations with the RI-SMOM scheme and HISQ action
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34674@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Hatton (University of Glasgow)\nLattice QCD p
rovides several avenues for the high precision determination of quark mass
es. Using the RI-SMOM scheme applied to lattice calculations with the HISQ
action\, we obtain mass renormalisation factors that we use to provide st
range and charm quark masses with 1% precision. The calculation involves t
he study of various sources of systematic uncertainty\, including an analy
sis of possible nonperturbative (condensate) condensate contributions. The
se results allow a comparison of different mass determination methods of c
omparable precision. In particular we (HPQCD) find good agreement between
RI-SMOM and current-current correlator determinations based on the same la
ttice QCD bare masses\, providing a strong test of our understanding of sy
stematic uncertainties.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34674/
LOCATION:Kellogg Hotel and Conference Center 104
URL:https://indico.fnal.gov/event/15949/contributions/34674/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson electromagnetic form factors from lattice QCD
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34673@indico.fnal.gov
DESCRIPTION:Speakers: Christine Davies (University of Glasgow)\nLattice QC
D can provide direct determination of the electromagnetic form factors of
mesons as a prediction to be compared to upcoming experiments at Jefferson
Lab. At the same time we can compare to expectations from perturbative QC
D\, which take a very simple form at high Q^2. \nWe will show recent resul
ts from HPQCD\, building on the work in 1701.04250. \nWe give predictions
for pi and K mesons up to 4 GeV^2 that include calculations for physical u
/d quarks and provide accurate predictions for Jefferson Lab. \nWe also ex
tend the Q^2 range up to 20 GeV^2 by studying mesons made of heavier quark
s. At these values of Q^2\, discrepancies (both in the values and the Q^2-
dependence) with perturbative QCD raise issues of the reliability of the a
ssumptions going in to the perturbative QCD calculations. This has wider i
mplications also for other processes.\n\nhttps://indico.fnal.gov/event/159
49/contributions/34673/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34673/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to D^{(*)}\\ell\\nu$ form factors from $N_f$=2+1 QCD with Moe
bius domain-wall quarks
DTSTART;VALUE=DATE-TIME:20180724T234500Z
DTEND;VALUE=DATE-TIME:20180725T014500Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34672@indico.fnal.gov
DESCRIPTION:Speakers: Takashi Kaneko (KEK)\nWe report our preliminary resu
lts for the $B \\to D^{(*)}\\ell\\nu$\nsemileptonic form factors at zero a
nd nonzero recoils in 2+1 flavor\nQCD. The Moebius domain-wall action is e
mployed for light\, charm\nand bottom quarks at lattice cutoffs $a^{-1}$ =
2.5 and 3.6 GeV.\nWe take bottom quark masses up to 2.4 times the physica
l charm mass\nto control discretization effects. We test the heavy quark s
caling\nof the form factors for the extrapolation to the physical bottom m
ass.\n\nhttps://indico.fnal.gov/event/15949/contributions/34672/
LOCATION:Kellogg Hotel and Conference Center Lincoln
URL:https://indico.fnal.gov/event/15949/contributions/34672/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering phase shift determinations from a two-scalar field theo
ry and resonance parameters from QCD scattering
DTSTART;VALUE=DATE-TIME:20180726T133000Z
DTEND;VALUE=DATE-TIME:20180726T135000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34671@indico.fnal.gov
DESCRIPTION:Speakers: Daniel Darvish (Carnegie Mellon University)\nThe two
-scalar field model of Rummukainen and Gottleib is revisited\, except the
limit of large quartic couplings is not used and a Symanzik improved actio
n is used. Isotropic lattices ranging from $16^3 \\times 48$ to $53^3 \\ti
mes 48$ are used\, and the scattering phase shift is determined using a L
üscher analysis.\n\nResults from $K\\pi$ and $N\\pi$ scattering will also
be presented.\n\nhttps://indico.fnal.gov/event/15949/contributions/34671/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34671/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exclusive Channel Study of the Muon HVP
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34670@indico.fnal.gov
DESCRIPTION:Speakers: Aaron Meyer (Brookhaven National Laboratory)\nThe Ha
dronic Vacuum Polarization (HVP) is a dominant contribution to the theoret
ical uncertainty of the muon anomalous magnetic moment. The uncertainty in
lattice QCD calculations of the HVP are dominated by the long-distance co
ntribution to the vector correlation function. With explicit studies of th
e exclusive channels of the HVP diagram\, it is possible to reconstruct th
e long-distance behavior of the correlation function. This has the effect
of replacing the large statistical uncertainty of the correlation function
with a significantly smaller uncertainty from the reconstruction. In this
talk\, I will present preliminary results of an exclusive study of the ve
ctor-vector correlation function using the distillation technique. The com
putation is performed on 2+1 flavor Mobius Domain Wall Fermion ensembles w
ith physical pion mass. Reconstruction of the long-distance correlation fu
nction will enable lattice-only calculations of the HVP to achieve precisi
on similar to estimates of the HVP from the R-ratio method on the timescal
e of the new experimental measurements of the muon anomalous magnetic mome
nt.\n\nhttps://indico.fnal.gov/event/15949/contributions/34670/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34670/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review of Lattice Muon g-2 HLbL Calculation
DTSTART;VALUE=DATE-TIME:20180725T150000Z
DTEND;VALUE=DATE-TIME:20180725T153000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34669@indico.fnal.gov
DESCRIPTION:Speakers: Luchang Jin (BNL)\nRecent lattice QCD results for ha
dron light-by-light\nscattering (HLbL) and its contribution to muon anomal
ous magnetic\nmoments (g-2) will be reviewed. There are currently more tha
n three\nstandard deviations between the BNL experimental result and the\n
theoretical prediction. The Fermilab/JPARC experiments will reduce the\nex
perimental uncertainty by a factor of four. The uncertainty of\ntheory pre
diction needs to be reduced to a similar level. With the\nrecent progress
in the dispersive approaches and the lattice\ncalculations in determining
the hadron vacuum polarization (HVP)\ncontribution to muon g-2\, HLbL is b
ecoming the leading source of\nuncertainty in the theoretical prediction.
Lattice QCD provides a\nsystematic improvable way to calculate HLbL and a
result with reliable\nerror can be eventually obtained. In this regard\, I
overview the\nrecent progress in the lattice calculations of HLbL\, the c
urrent\nstatus of the calculation\, and the future plans. In particular\,
I\nwould discuss the method for handling the finite volume errors and the\
ndiscretization errors.\n\nhttps://indico.fnal.gov/event/15949/contributio
ns/34669/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase Fluctuations and Sign Problems
DTSTART;VALUE=DATE-TIME:20180727T190000Z
DTEND;VALUE=DATE-TIME:20180727T192000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34668@indico.fnal.gov
DESCRIPTION:Speakers: Michael Wagman (MIT)\nCorrelation functions for bary
ons\, or generically systems with different U(1) charges than the vacuum\,
have phase fluctuations that lead to sign problems obstructing studies of
finite-density matter using correlation functions. I will discuss phase f
luctuations in lattice QCD and in a one-dimensional complex scalar field t
oy model and methods to exploit the structure of phase fluctuations to avo
id or reduce sign problems. Phase reweighting correlation functions with d
estructively interfering phases near correlation function sources and sink
s allows additional independent interpolating operators to be constructed
from correlation functions in a generalization of the generalized pencil-o
f-functions technique that reduces the variance of the additional sources
by suppressing phase fluctuations during source-creation. I will also intr
oduce a new method in which phase unwrapping techniques from signal proces
sing and engineering are applied to map compact random variables for which
parameter inference has an exponentially severe signal-to-noise problem t
o non-compact random variables whose moments can be calculated without sig
n problems or severe signal-to-noise degradation. A cumulant expansion can
be used to relate unwrapped phase moments to average correlation function
s\, but large phase jumps associated with heavy-tailed distributions surpr
isingly observed in free scalar field theory and lattice QCD can lead to s
ignificant truncation errors. I will briefly outline one-dimensional phase
unwrapping results and outlook towards multi-dimensional applications whe
re truncation errors might be better controlled.\n\nhttps://indico.fnal.go
v/event/15949/contributions/34668/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase Unwrapping and One-Dimensional Sign Problems
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34667@indico.fnal.gov
DESCRIPTION:Speakers: Gurtej Kanwar (MIT)\nLattice QCD estimates of correl
ation functions with non-zero U(1) baryon number suffer from a well known
signal-to-noise problem at large time separations. Previous work has shown
that this can be attributed to a widening phase distribution over a circu
lar domain\, where standard estimators perform exponentially poorly as the
distribution approaches uniform. We present a new approach to this proble
m: we apply phase unwrapping from the MRI and radar domains to translate t
he phase circular distribution to an "unwrapped phase" distribution over t
he reals. Applied to the simple harmonic oscillator as a toy model\, unwra
pping demonstrates no exponential signal-to-noise growth in time at leadin
g order in a convergent cumulant expansion. We explore choices of unwrappi
ng schemes and demonstrate precise ground-state energy estimates with a go
od scheme choice. Truncation error in the cumulant expansion is found to b
e highly sensitive to the choice of unwrapping scheme\, indicating that mo
re a robust family of schemes or choice of expansion is needed to apply th
is technique to non-trivial models. Arguments based on topological defects
suggest that multidimensional unwrapping schemes should be more robust to
regions of undersampling\, motivating future work with spatially-resolved
correlators in higher dimensions.\n\nhttps://indico.fnal.gov/event/15949/
contributions/34667/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34667/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear Matrix Elements for Neutrinoless Double Beta Decay from La
ttice QCD
DTSTART;VALUE=DATE-TIME:20180724T200000Z
DTEND;VALUE=DATE-TIME:20180724T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34666@indico.fnal.gov
DESCRIPTION:Speakers: David Murphy (MIT)\nWhile neutrino oscillation exper
iments have demonstrated that neutrinos have small\, nonzero masses\, much
remains unknown about their properties and decay modes. One potential dec
ay mode --- neutrinoless double beta decay ($0 \\nu \\beta \\beta$) --- is
a particularly interesting target of experimental searches\, since its ob
servation would imply both the violation of lepton number conservation in
nature as well as the existence of at least one Majorana neutrino\, in add
ition to giving further constraints on the neutrino masses. Relating exper
imental constraints on $0 \\nu \\beta \\beta$ decay rates to the neutrino
masses\, however\, requires theoretical input in the form of non-perturbat
ive nuclear matrix elements which remain difficult to calculate reliably.
In this talk we will discuss the prospects for a first-principles calculat
ion of the relevant nuclear matrix elements using lattice QCD and effectiv
e field theory techniques\, assuming neutrinoless double beta decay mediat
ed by a light Majorana neutrino. As a proof-of-principles we will show pre
liminary results from a lattice calculation of the related $\\pi^{-} \\rig
htarrow \\pi^{+} e^{-} e^{-}$ transition amplitude.\n\nhttps://indico.fnal
.gov/event/15949/contributions/34666/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34666/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curvature Correlators in Lattice Quantum Gravity
DTSTART;VALUE=DATE-TIME:20180723T192000Z
DTEND;VALUE=DATE-TIME:20180723T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34665@indico.fnal.gov
DESCRIPTION:Speakers: Scott Bassler (Syracuse University)\nWe study the cu
rvature-curvature correlator for quantum gravity in the case of degenerate
Euclidean Dynamical Triangulations\, drawing on recent insights to modify
the procedure for calculating connected correlation functions to reduce f
inite size effects. We find asymptotically a positive norm state\, and a d
ecay consistent with a power law\, but cannot yet resolve what this power
is in the continuum limit. Preliminary results suggest a power possibly co
nsistent with our expectations for gravity.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34665/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34665/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\mathcal{N}=1$ Supersymmetric $SU(3)$ Gauge Theory - Pure Gauge
sector with a twist
DTSTART;VALUE=DATE-TIME:20180727T225000Z
DTEND;VALUE=DATE-TIME:20180727T231000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34664@indico.fnal.gov
DESCRIPTION:Speakers: Marc Steinhauser (Friedrich Schiller University Jena
)\nSupersymmetric gauge theories are a popular building block of theories
beyond the standard model. We investigate the pure gauge sector of Super-Q
CD focusing on the bound states\, i.e. mesonic gluinoballs\, gluino-glueba
lls and pure glueballs. To improve chiral symmetry as well as supersymmetr
y at finite lattice spacing\, we introduce a deformed Super-Yang-Mills lat
tice action. It contains a twist term\, similar to the twisted mass formul
ation of lattice QCD. We furthermore explore if the multigrid method (DDal
phaAMG solver) applied to the gluinos (adjoint Majorana fermions) achieves
similar improvements as one finds for QCD.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34664/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34664/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B\\rightarrow D^\\ast\\ell\\nu$ at non-zero recoil
DTSTART;VALUE=DATE-TIME:20180727T192000Z
DTEND;VALUE=DATE-TIME:20180727T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34663@indico.fnal.gov
DESCRIPTION:Speakers: Alejandro Vaquero (University of Utah)\nWe present p
reliminary blinded results from our analysis of the form factors for B¯
→D⋆ℓν¯ decay at non-zero recoil. Our analysis includes 15 MILC asq
tad ensembles with Nf=2+1 flavors of sea quarks and lattice spacings rangi
ng from a≈0.15 fm down to 0.045 fm. The valence light quarks employ the
asqtad action\, whereas The b and c quarks are treated using the Fermilab
action. We discuss the impact that our results will have on |V_cb| and R(D
*).\n\nhttps://indico.fnal.gov/event/15949/contributions/34663/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scalar\, Axial and Tensor Matrix elements in light nuclei
DTSTART;VALUE=DATE-TIME:20180724T194000Z
DTEND;VALUE=DATE-TIME:20180724T200000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34662@indico.fnal.gov
DESCRIPTION:Speakers: William Detmold (MIT)\nI will discuss recent calcula
tions of the matrix elements of scalar\, axial and tensor quark bilinear o
perators in light nuclei at unphysically heavy values of the quark masses.
Axial matrix elements control the Gamow-Teller decays of nuclei and have
potential for precision tests of the Standard Model. Tensor matrix element
s determine the quark chromo-electric dipole moment and are important in t
he context of proposed experiments to measure nuclear EDMs. Scalar matrix
elements are important for interpretation of dark matter direct detection
experiments. Our calculations provide a full flavour decomposition of the
matrix elements in A=1\,2\,3 nucleon system. Nuclear effects are resolved
in most channels\, with axial and tensor matrix elements modified at the p
ercent level from naive expectations. In contrast\, the scalar matrix elem
ents in the nuclei differ at the 10% level from scaling those of the nucle
on. If these effects persist at the physical quark masses and for larger\,
experimentally practical nuclei\, their phenomenological impact would be
significant.\n\nhttps://indico.fnal.gov/event/15949/contributions/34662/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34662/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Physics with All HISQ Fermions
DTSTART;VALUE=DATE-TIME:20180726T141000Z
DTEND;VALUE=DATE-TIME:20180726T143000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34661@indico.fnal.gov
DESCRIPTION:Speakers: Yin Lin (University of Chicago)\nA precise determina
tion of the nucleon axial form factor will greatly reduce systematic error
s for the upcoming neutrino scattering experiments. There are no foreseeab
le experiments to perform such measurement so lattice QCD is the best tool
to accomplish the task. Such calculations are especially timely\, because
the uncertainty on the axial form factor is often underestimated in exper
imental analyses. In this talk\, I will present our progress towards calcu
lating nucleon axial form factor. Here\, we use $2+1+1$ MILC HISQ action f
or both sea and valence quarks at the physical pion mass. First\, prelimin
ary results of the extraction of nucleon and delta masses from two-point c
orrelators (using Bayesian fitting methodology) at three lattice spacing w
ill be discussed. Then\, I will present preliminary data of three-point co
rrelators at both zero and non-zero momenta which will be used in the extr
action of the nucleon axial charge and form factor once we have full stati
stics.\n\nhttps://indico.fnal.gov/event/15949/contributions/34661/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34661/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse spin structure of octet baryons
DTSTART;VALUE=DATE-TIME:20180725T200000Z
DTEND;VALUE=DATE-TIME:20180725T202000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34660@indico.fnal.gov
DESCRIPTION:Speakers: Jacob Bickerton (University of Adelaide)\nThe transv
erse spin structure of matter is a subject of research that has not been t
horoughly explored experimentally\, providing the opportunity to produce k
ey insight from lattice QCD. We present the latest results of the transver
se spin densities of the octet baryons through analysis of electromagnetic
and tensor form factors. We employ $N_f=2+1$ flavours of $\\mathcal{O}(a)
$-improved Wilson fermions\, generated with the average quark mass held fi
xed at its physical value. By performing an SU(3) flavour-breaking expansi
on of the form factors\, we extrapolate to physical pion mass. From this w
e show the spin-spin correlations and the transverse density distributions
of the octet baryons.\n\nhttps://indico.fnal.gov/event/15949/contribution
s/34660/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34660/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on the nature of the QCD thermal transition as a function
of quark flavors and masses
DTSTART;VALUE=DATE-TIME:20180726T160000Z
DTEND;VALUE=DATE-TIME:20180726T162000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34659@indico.fnal.gov
DESCRIPTION:Speakers: Francesca Cuteri (J. W. Goethe Universität)\nWe inv
estigate to which extent we can exploit the dependence of the order of the
chiral transition on the number of light degenerate flavors $N_\\text{f}$
\, re-interpreted as continuous parameter in the path integral formulation
\, as a means to perform a controlled chiral extrapolation and deduce the
order of the transition for the case $N_\\text{f}=2$\, which is still unde
r debate.\n\nhttps://indico.fnal.gov/event/15949/contributions/34659/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34659/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of Scalar Field Theories with Complex Actions
DTSTART;VALUE=DATE-TIME:20180724T211000Z
DTEND;VALUE=DATE-TIME:20180724T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34658@indico.fnal.gov
DESCRIPTION:Speakers: Michael Ogilvie (Washington University in St. Louis)
\nMany scalar field theory models with complex actions are invariant unde
r the antilinear ($\\mathcal{PT}$) symmetry operation $L^{*}(-\\chi)=L(\\c
hi)$. Models in this class include $i \\phi^3$\, the Bose gas at finite de
nsity and Polyakov loop spin models at finite density. This symmetry may b
e used to obtain a dual representation where weights in the functional int
egral are real but not necessarily positive. For a subclass of models sati
sfying a dual positive weight condition\, the sign problem is absent\; suc
h models are easily simulated by a simple local algorithm in any number of
dimensions. The existence of a positive representation is constrained by
Lee-Yang zeros\, and tied to the phase structure of a given model. Simula
tions of models in this subclass show a rich set of behaviors. Propagators
may exhibit damped oscillations\, indicating a clear violation of spectra
l positivity. Domain patterns may occur in equilibrium\, with both stripe
and bubble morphologies occurring. These behaviors appear to be likely in
finite density QCD in the vicinity of the critical line.\n\nhttps://indico
.fnal.gov/event/15949/contributions/34658/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of $K \\to \\pi l \\nu$ form factor in $N_f = 2+1$ QCD
at physical point on $(10 {\\rm fm})^3$ volume
DTSTART;VALUE=DATE-TIME:20180725T192000Z
DTEND;VALUE=DATE-TIME:20180725T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34657@indico.fnal.gov
DESCRIPTION:Speakers: Junpei Kakazu (Univ. of Tsukuba)\nWe present our pre
liminary result of the form factor of $K \\to \\pi l \\nu$\nsemileptonic d
ecays on the large volume configuration\, $L \\approx 10$ fm\,\nwith the p
hysical $m_{\\pi}$ and $m_{K}$ using the stout-smearing\nclover quark and
Iwasaki gauge actions at $a^{-1}=2.333$ GeV.\nFrom an interpolation using
the data in small momentum transfers\, \nwe determine the semileptonic dec
ay form factors at zero momentum transfer.\nThe result is compared with th
e previous lattice calculations.\nWe also estimate the value of $|V_{us}|$
by combining our result \nwith the experimental value of the kaon semilep
tonic decay.\n\nhttps://indico.fnal.gov/event/15949/contributions/34657/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34657/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analysis of systematic error in hadronic vacuum polarization contr
ibution to muon g-2
DTSTART;VALUE=DATE-TIME:20180724T215000Z
DTEND;VALUE=DATE-TIME:20180724T221000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34656@indico.fnal.gov
DESCRIPTION:Speakers: Eigo Shintani (RIKEN-CCS)\nWe present a systematic s
tudy of finite size correction and cut-off effect in hadronic vacuum polar
ization contribution to muon g-2 with two volumes\, 5.4 fm$^3$ and 10.8 fm
$^3$\, and two lattice cut-off\, 2.33 GeV and 3.06 GeV\, at the physical p
ion on the PACS configuration. In this analysis\, using high statistics da
ta\, we compare two volumes at long-distance on the physical point to dire
ctly estimate the finite size correction\, and it then makes a comparison
with ChPT prediction. Using the different cut-off scales on ~10.8 fm$^3$ l
attice box\, we try to estimate the cut-off effect with local and point-sp
litting operators on the two cut-off configurations.\n\nhttps://indico.fna
l.gov/event/15949/contributions/34656/
LOCATION:Kellogg Hotel and Conference Center 105
URL:https://indico.fnal.gov/event/15949/contributions/34656/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weak coupling limit of 2+1 SU(2) LGT and mass gap.
DTSTART;VALUE=DATE-TIME:20180725T192000Z
DTEND;VALUE=DATE-TIME:20180725T194000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34655@indico.fnal.gov
DESCRIPTION:Speakers: Sreeraj T P (The Institute of Mathematical Sciences\
, Chennai\, India)\nDual description of SU(2) lattice gauge theory in 2+1
dimensions is shown to be the theory of interacting gauge invariant ‘abe
lian like’ electric loops. The Gauss law is solved exactly to construct
the Hilbert space of the gauge invariant theory using the Schwinger boson
representation. This is achieved by envisaging what is called the ‘split
ting of a point'. Such a 'point split' lattice allows us to describe non l
ocal electric loops in terms of three independent\, local\, gauge invarian
t quantum numbers at each site satisfying triangle inequalities. The matri
x elements of the Hamiltonian becomes simpler and triangle inequalities be
come subdominant in the weak coupling limit. The closed loop dynamics is a
nalysed using a gauge invariant phase space path integral. In the weak cou
pling limit\, the mean gauge invariant electric flux becomes large and sma
ll spatial electric flux loops dominate in the vacuum state leading to a m
ass gap.\n\nhttps://indico.fnal.gov/event/15949/contributions/34655/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34655/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic decays of $B_{(s)}$ mesons to light pseudoscalar meso
ns on four-flavor HISQ ensembles
DTSTART;VALUE=DATE-TIME:20180727T221000Z
DTEND;VALUE=DATE-TIME:20180727T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34654@indico.fnal.gov
DESCRIPTION:Speakers: Zechariah Gelzer (University of Iowa)\nWe report the
status of an ongoing lattice-QCD calculation of form factors\nfor exclusi
ve semileptonic decays of $B$~mesons with both charged currents\n($B\\to\\
pi\\ell\\nu$\, $B_s\\to K\\ell\\nu$) and neutral currents\n($B\\to\\pi\\el
l^+\\ell^-$\, $B\\to K\\ell^+\\ell^-$). The results are important for\ncon
straining or revealing physics beyond the Standard Model. This work uses\n
MILC's (2+1+1)-flavor ensembles with the HISQ action for the sea and light
\nvalence quarks and the clover action in the Fermilab interpretation for
the\n$b$~quark. Simulations are carried out at three lattice spacings down
to\n$0.088$~fm\, with both physical and unphysical sea-quark masses. We p
resent\npreliminary blinded results for the form factors $f_+(q^2)$\, $f_0
(q^2)$\, and\n$f_T(q^2)$ (in terms of momentum transfer $q^2$)\, along wit
h an examination of\nsystematic errors. Our preliminary results include st
udies of $z$-expansion\nmethods to extend the kinematic range.\n\nhttps://
indico.fnal.gov/event/15949/contributions/34654/
LOCATION:Kellogg Hotel and Conference Center 103
URL:https://indico.fnal.gov/event/15949/contributions/34654/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral transition using the Banks-Casher relation
DTSTART;VALUE=DATE-TIME:20180726T164000Z
DTEND;VALUE=DATE-TIME:20180726T170000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34653@indico.fnal.gov
DESCRIPTION:Speakers: Gergely Endrodi (Goethe University Frankfurt)\nWe in
vestigate the properties of the finite-temperature \nQCD transition toward
s the chiral limit using staggered \nquarks. Starting from the 2+1 flavor
physical point\, the \nlimit of massless quarks is approached along two di
fferent \ntrajectories in the Columbia-plot. Unlike in previous \napproach
es\, the chiral condensate is determined via the \nBanks-Casher relation.
The first results of our finite \nsize scaling analysis are presented.\n\n
https://indico.fnal.gov/event/15949/contributions/34653/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of three flavor QCD in external magnetic fields us
ing HISQ fermions
DTSTART;VALUE=DATE-TIME:20180725T221000Z
DTEND;VALUE=DATE-TIME:20180725T223000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34652@indico.fnal.gov
DESCRIPTION:Speakers: Akio Tomiya (Central China Normal University)\nWe st
udy the phase structure of QCD with three degenerate flavors in external m
agnetic fields using HISQ fermions. The simulations are performed on $16^3
\\times6$ and $24^3\\times6$ lattices. In order to investigate the quark m
ass dependence of the QCD transition we vary the values of quark masses fr
om 0.015 to 0.0009375 corresponding to $m_\\pi=320$ MeV and $80$ MeV in th
e continuum limit. We found no indication of a first order phase transitio
n in the current window of quark masses and external magnetic fields. Unli
ke to the case with standard staggered fermions inverse magnetic catalysis
is always observed above the critical temperature. The microscopic origin
of this phenomena as well as the volume effects are further discussed by
looking into the Dirac eigenvalue spectrum.\n\nhttps://indico.fnal.gov/eve
nt/15949/contributions/34652/
LOCATION:Kellogg Hotel and Conference Center Centennial
URL:https://indico.fnal.gov/event/15949/contributions/34652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\mathcal{N}=1$ Supersymmetric $SU(3)$ Gauge Theory - Towards sim
ulations of Super-QCD
DTSTART;VALUE=DATE-TIME:20180727T223000Z
DTEND;VALUE=DATE-TIME:20180727T225000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34651@indico.fnal.gov
DESCRIPTION:Speakers: Björn Wellegehausen (FSU Jena)\n$\\mathcal{N}=1$ Su
persymmetric QCD (SQCD) is a possible building block of theories beyond th
e standard model. It describes the interaction between gluons and quarks w
ith their superpartners\, gluinos and squarks. Since supersymmetry is\nexp
licitly broken by the lattice regularization\, a careful fine-tuning of op
erators is necessary to obtain a supersymmetric continuum limit. For the p
ure gauge sector\, $\\mathcal{N}=1$ Supersymmetric Yang-Mills theory\, sup
ersymmetry is\nonly broken by a non-vanishing gluino mass. If we add matte
r fields\, this is no longer true and more operators in the scalar squark
sector have to be considered for fine-tuning the theory. Guided by a one-l
oop calculation\, we\nshow that maintaining chiral symmetry in the light s
ector is nevertheless an important step. Furthermore\, we present first pr
eliminary lattice results on the fine-tuning and bound-state spectrum of S
QCD.\n\nhttps://indico.fnal.gov/event/15949/contributions/34651/
LOCATION:Kellogg Hotel and Conference Center Big Ten A
URL:https://indico.fnal.gov/event/15949/contributions/34651/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on parton pseudo distributions I
DTSTART;VALUE=DATE-TIME:20180723T211000Z
DTEND;VALUE=DATE-TIME:20180723T213000Z
DTSTAMP;VALUE=DATE-TIME:20200601T233625Z
UID:indico-contribution-15949-34650@indico.fnal.gov
DESCRIPTION:Speakers: Joseph Karpie (William and Mary)\, Savvas Zafeiropou
los (Universitaet Heidelberg)\nIn this presentation we will show theoretic
al developments that facilitate the better reconstruction of light cone pa
rton distributions starting from reduced Ioffe time pseudo distributions c
alculated on the lattice. We also present our new results of parton distri
butions for the nucleon and pion from an $N_{\\rm f}=2+1$ simulation of Wi
lson-clover fermions with stout smearing and tree-level tadpole improved S
ymanzik gauge action at two different lattice spacings. \nThis is the firs
t of two consecutive talks on the subject.\n\nhttps://indico.fnal.gov/even
t/15949/contributions/34650/
LOCATION:Kellogg Hotel and Conference Center 106
URL:https://indico.fnal.gov/event/15949/contributions/34650/
END:VEVENT
END:VCALENDAR