Prof. Dean Lee (Michigan State University)
7/23/18, 9:20 AM
The Facility for Rare Isotope Beams (FRIB) is a DOE national user facility being built at Michigan State University that will be a world leader in rare nuclear isotopes. The first part of the talk is an overview of the design and current status of the facility. The second part discusses the impact of FRIB on nuclear science, astrophysics, fundamental symmetries, and societal applications. ...
Emanuele Mereghetti (Los Alamos National Laboratory)
7/23/18, 10:00 AM
Low-energy tests of fundamental symmetries are extremely sensitive probes of physics beyond the Standard Model (SM), reaching scales that are comparable, if not higher, than directly accessible at the energy frontier. The interpretation of low-energy precision experiments and their connection with models of BSM physics relies on controlling the theoretical uncertainties induced by the...
Dr Evan Berkowitz (Forschungszentrum Jülich)
7/23/18, 11:00 AM
Anchoring the nuclear interaction in QCD is a long-outstanding problem in nuclear physics. While the lattice community has made enormous progress in mesonic physics and single nucleon physics, continuum-limit physical-point multi-nucleon physics has remained out of reach. I will review CalLat's strategy for multi-nucleon spectroscopy and our latest results.
Prof. Claudia Ratti Ratti (University of Houston)
7/23/18, 11:30 AM
In 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 available in the continuum limit and for physical quark masses. This allows a comparison with measurements from heavy ion collisions for the first time. I will review the state-of-the-art results from lattice simulations of QCD thermodynamics...
David Schaich (University of Bern)
7/24/18, 9:00 AM
Physics Beyond the Standard Model
Supersymmetry plays prominent roles in modern theoretical physics, as a tool to improve our understanding of quantum field theory, as an ingredient in many new physics models, and as a means to study quantum gravity via holographic duality. Lattice investigations of supersymmetric field theories have a long history but often struggle due to the interplay of supersymmetry with the...
Oliver Witzel Witzel (University of Colorado Boulder)
7/24/18, 9:30 AM
Applications Beyond QCD
Composite 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 embedded into the Standard Model of elementary particle physics meeting experimental constraints, I will review efforts by the community to explore the physics of this new strong...
Dr Javad Komijani (University of Glasgow)
7/24/18, 10:45 AM
Standard Model Parameters and Renormalization
We discuss the determination of quark masses using the MILC highly improved staggered-quark ensembles with four flavors of dynamical quarks. We extract quark masses from heavy-light pseudoscalar meson masses by making use of heavy quark effective theory (HQET) and continuum-QCD perturbative calculations. While heavy-light meson masses can be measured very precisely on lattice, perturbative...
Dr Shoji Hashimoto (KEK)
7/24/18, 11:15 AM
Weak Decays and Matrix Elements
Heavy flavor physics has entered a new era when the Belle II experiment observed its first collision. There are several hints found so far by BaBar, Belle, and LHCb in particular, that suggest the physics beyond the Standard Model appearing in the loop processes at short distances. They will be further tested by higher precision experiments in the coming years. The role of lattice...
Swagato Mukherjee (BNL)
7/24/18, 12:00 PM
Nonzero Temperature and Density
I will review the recent progress and results on the bulk thermodynamic properties of QCD matter from Lattice. In particular I will highlight the recent calculations of the equation of state, pressure of QCD matter to the finite baryon density regime as far as $\mu_B/T~2.5$, giving us some preliminary bounds on the location of the critical end-point. I will also stress upon the fact...
Dr Kohtaroh Miura (CPT, Aix-Marseille Universite)
7/25/18, 9:00 AM
Recent lattice QCD results for hadron vacuum polarization (HVP) and its contribution to muon anomalous magnetic moments (g-2) will be reviewed. There currently exists tension of more than 3-sigma deviations in muon g-2 between the BNL experiment with 0.5 ppm precision and the Standard Model (SM) prediction with the QCD dispersion relation used for HVP. The lattice QCD predictions without...
Prof. Krstic Marinkovic Marina (CERN/Trinity College Dublin)
7/25/18, 9:30 AM
The dominating uncertainty in the Standard Model prediction of the muon g-2 is coming from the hadronic contributions. The Muon g-2 experiment at Fermilab has started the major data collection and the aimed four-fold increase in precision will shed light on the current discrepancy between the theory prediction and the measured value. A reciprocal effort to directly measure the hadronic...
Dr Luchang Jin (BNL)
7/25/18, 10:00 AM
Recent lattice QCD results for hadron light-by-light scattering (HLbL) and its contribution to muon anomalous magnetic moments (g-2) will be reviewed. There are currently more than three standard deviations between the BNL experimental result and the theoretical prediction. The Fermilab/JPARC experiments will reduce the experimental uncertainty by a factor of four. The uncertainty...
Dr Padmanath Madanagopalan (Universitaet Regensburg)
7/25/18, 11:00 AM
Hadron Spectroscopy and Interactions
I review recent results on hadron spectroscopy using lattice QCD. In light of the recent discoveries in heavy baryon sector at LHCb, lattice calculations in this regard will be emphasized. Recent lattice calculations on light baryon, heavy-heavy and heavy-light meson resonances will also be discussed.
Zohreh Davoudi (University of Maryland)
7/25/18, 11:45 AM
Prof. Xiangdong Ji (U. Maryland/Shanghai Jiao Tong University)
7/27/18, 9:00 AM
Electron-Ion Collider (EIC) is the highest priority for new construction in US nuclear science community and will likely to start physics program in about 5-10 years from now. EIC 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 parton distributions and...
Dr Jeremy Green (DESY, Zeuthen)
7/27/18, 9:30 AM
The current status of calculations of simple nucleon structure observables, such as the axial charge, will be reviewed. Recent calculations have produced steadily better control over the standard sources of systematic uncertainty, and there are now multiple groups doing calculations with near-physical quark masses. A major challenge is the combination of an exponentially decaying...
Yibo Yang (Michigan State University)
7/27/18, 10:00 AM
We calculate the intrinsic quark and gluon spin contribution to the total proton spin using overlap fermions on Domain-wall ensembles. We find that the total quark spin, with the axial Ward identity satisfied, is ~40%, and the glue spin contribution is ~50% if the matching procedure in LaMET is neglected. The imperative non-perturbative renormalization to obtain the quark and glue angular...
Dr Christopher Monahan (University of Washington)
7/27/18, 11:00 AM
First principles calculations of the Bjorken-x dependence of hadron structure have been a long-standing challenge for lattice QCD. This year marks a significant milestone: the first determinations of parton distribution functions, which capture the longitudinal momentum structure of fast-moving hadrons, at physical pion masses. Moreover, there has been significant progress in our understanding...
Dr Andreas Kronfeld (Fermilab)
7/27/18, 11:45 AM
Weak Decays and Matrix Elements
Plans 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 section. In this talk I illustrate how lattice QCD calculations (combined with nuclear many-body theory and experimental data) can reduce the...
Dr Meifeng Lin (Brookhaven National Laboratory)
7/28/18, 9:00 AM
Algorithms and Machines
I will review recent progress in software development for lattice QCD on novel architectures and new machines. I will also report some algorithmic advancements in ensemble generation, solvers and contractions.
Dr Mathias Wagner (NVIDIA)
7/28/18, 9:45 AM
Algorithms and Machines
In the 10 years since the creation of the QUDA library for Lattice QCD on NVIDIA GPUs the hardware and software features of GPU systems have evolved dramatically. Not only has the raw Dslash kernel performance on a single GPU improved by more than one order of magnitude but also modern GPUs are often deployed in "Fat Nodes" with up to 8 GPUs. We report on the techniques that QUDA implements to...
Dr Mari Carmen Banuls (Max Planck Institute of Quantum Optics)
7/28/18, 10:15 AM
The term Tensor Network States (TNS) has become a common one in the context of numerical studies of quantum many-body problems. It refers to a number of families that represent different ansatzes for the efficient description of the state of a quantum many-body system. The first of these families, Matrix Product States (MPS), lies at the basis of Density Matrix Renormalization Group methods,...
Prof. Akira Ohnishi (Yukawa Institute for Theoretical Physics, Kyoto University)
7/28/18, 11:15 AM
Nonzero Temperature and Density
We introduce the feedforward neural network in the path optimization method (POM) to evade the sign problem in field theories. POM is based on the complexification of integral variables as in the complex Langevin method and the Lefschetz thimble method. The integration path is optimized in the complexified variable space by maximizing the average phase factor. In the last Lattice meeting ...
Prof. John Preskill (Caltech)
7/28/18, 11:45 AM