Sevil Salur
(Rutgers University)
1/11/16, 9:10 AM
In this talk, we review the latest developments of jet finding techniques and corresponding experimental results from LHC Experiments.
Mr
Patriz Hinderer
(University of Tuebingen)
1/11/16, 9:40 AM
In this talk we discuss the resummation of large logarithmic perturbative corrections to single-inclusive jet production at hadron colliders. The corrections arise near the threshold for the partonic reaction, when the incoming partons have just enough energy to produce the high-transverse-momentum final state. We show that these corrections are important on the way to precision jet...
Dr
Andrew Hornig
(LANL)
1/11/16, 10:10 AM
Using a new version of Soft Collinear Effective Theory, SCET_++, with a new "soft-collinear" mode, we achieve the resummation of logarithms of jet radii R in jet rates and jet thrust cross sections beyond leading-log accuracy. We extract two and three-loop anomalous dimensions necessary for resummation of (global) logs of R to NNLL and N3LL accuracy.
Mr
Yiannis Makris
(Duke University)
1/11/16, 11:00 AM
We present the calculation of the unmeasured soft function necessary for the study of dijet production in pp collisions. The calculation is independent of the choice of the jet (sub-)structure measurement. While our results are valid for all 2 -> 2 channels, we compute explicitly for the qq -> qq channel the color-flow matrices and plot the NNLL resummed differential cross section. A boost...
Daekyoung Kang
(Los Alamos National Lab)
1/11/16, 12:00 PM
Event shapes provide a key method of measuring jets in deep-inelastic scattering (DIS). This was done successfully by H1 and ZEUS and compared with theoretical calculations with next-to-leading-logarithmic (NLL) resummation.
We will present our progress for a high precision calculation of a event shape called DIS thrust, with next-to-next-to-next-to-leading-logarithmic resummation. We will...
Ramona Vogt
(LLNL and UC Davis)
1/11/16, 2:00 PM
Prof.
Yen-Jie Lee
(Massachusetts Institute of Technology)
1/11/16, 2:30 PM
One of the most important testing ground for the theoretical understanding of jet quenching is the parton flavor dependence of the in-medium energy loss and CMS has excellent capability to study heavy quark jets and mesons in heavy ion collisions. In this summary talk, studies of non-prompt J/psi, B and D meson production in pp, pPb and PbPb collisions at various of collision energies are...
Dr
HONGXI XING
(Los Alamos National Laboratory)
1/11/16, 3:00 PM
Theoretical and experimental advances in understanding light jet/hadron production and modification in Pb+Pb reactions have been a highlight of the LHC heavy ion program. At the same time, the detailed mechanisms of heavy quark propagation and energy loss in dense QCD matter are not yet fully understood. With this motivation, we present theoretical predictions for the
nuclear-induced...
Dr
Enrico Scomparin
(INFN Torino - Italy)
1/11/16, 4:00 PM
The study of quarkonium production in nuclear collisions is an essential tool to investigate the properties of the medium. After extended investigations at SPS and RHIC energies, the LHC experiments have collected, during run-1, a wealth of new data on charmonium and bottomonium production in both Pb-Pb and p-Pb collisions. Among other results, strong indications for the observation of charm...
Prof.
Yacine Mehtar-Tani
(INT, University of Washington)
1/11/16, 5:00 PM
The advent of the LHC opened up new perspectives for jet-quenching physics. For the first time, high enough energies are reached in heavy-ion experiments to produced jets in large numbers, and the unprecedented detector capabilities of ALICE, ATLAS and CMS, not only extend the kinematic range for the measurements previously performed at RHIC, but also allow to explore a variety of new...
Dr
Aaron Angerami
(Columbia University)
1/12/16, 9:00 AM
In relativistic heavy ion collisions a hot and dense medium of unscreened color charges is produced. Jets arising from hard scattering processes occurring in the early stages of the collisions become attenuated as they propagate through this medium, and thus jets are a crucial tool in characterizing the medium's properties. Connecting experimental results to a theoretical picture and...
Dr
Grigory Ovanesyan
(UMass)
1/12/16, 9:30 AM
Recently an effective field theory for jets in the dense QCD matter has been developed and applied for jet quenching phenomenology. This Soft Collinear Effective Theory with Glauber gluons allows for calculation of medium-induced splitting kernels beyond the approximations made in the traditional energy loss. In this talk we review such results and their incorporation in the QCD evolution...
Prof.
Rosi Reed
(Wayne State University)
1/12/16, 10:00 AM
For more than a decade, heavy-ion collisions have allowed us to study the Quark Gluon Plasma (QGP) created in these collisions, where relevant degrees of freedom are partonic rather than hadronic. In the initial stage of the collision, high energy nucleon collisions produce high transverse momentum partons, which fragment and hadronize into a spray of particles that we call a jet. Jets are a...
Dr
Yang-Ting Chien
(Los Alamos National Laboratory)
1/12/16, 11:00 AM
Jet substructures and cross sections provide crucial information about the jet formation mechanism. Their precise calculations are necessary for the understanding of the properties of the medium jets pass through. The calculations involve the resummation of large logarithms which can be performed using renormalization group techniques in soft-collinear effective theory. In heavy ion...
Mr
Raghav Kunnawalkam Elayavalli
(Rutgers University)
1/12/16, 11:30 AM
High energy proton lead collisions at the LHC allow us to study the effects of the nucleus on hard/soft interactions. These give us a handle on the initial state effects by taking advantage of asymmetry in the collision system. I will summarize the results on the nuclear modification factors for inclusive and heavy flavor tagged jets based on Run1 data collected in 2013 for pPb collisions at...
Prof.
Fredrick Olness
(SMU)
1/12/16, 2:00 PM
Searches for new physics will increasingly depend on identifying deviations from precision Standard Model predictions. At higher energies and higher precision, the heavy quarks play an increasingly prominent role. Recent theoretical developments improve our ability to address the multi-scale problem and properly incorporate heavy quark masses across the full kinematic range. This includes a...
Prof.
Zhenyu Ye
(UIC)
1/12/16, 3:00 PM
Dr
Kirill Lapidus
(Yale University)
1/12/16, 4:30 PM
Employing publicly available Monte Carlo models of jet modification in a partonic medium, we study jet-hadron correlations in heavy ion collisions at RHIC and LHC energies. In particular, we discuss the medium-induced broadening of the away-side peak. The surface bias, i.e. a trigger-dependent modification of the spatial distribution of hard scattering vertices, will be addressed as well.
Dr
leslie bland
(Brookhaven National Laboratory)
1/13/16, 9:00 AM
Forward particle production can be observed to large Feynman $x$ at $\sqrt{s}>$60 GeV in colliding beam experiments at RHIC. Large transverse single spin asymmetries (SSA) have been measured for pion production at large $x_F$ and to surprisingly large transverse momentum values. As an intended prelude for SSA measurements of forward Drell-Yan production of low-mass dileptons (AnDY), we...
Dr
Andrey Tarasov
(JLab)
1/13/16, 9:30 AM
I will discuss rapidity factorization approach and show how it can be used in analysis of evolution of gluon transverse momentum dependent (TMD) distribution functions. I will introduce an evolution equation which describes a smooth transition between linear evolution at x~1 and non-linear one at x<<1.
Reginald Bain
(Duke University)
1/13/16, 10:00 AM
We use the framework of Soft-Collinear Effective Theory (SCET) to study the production of B and J/psi mesons in jets. We focus on jets where the angularity, a class of jet-shape variable, of one of the jets is measured. Using factorization formulae provided by SCET, we calculate the next-to-leading-log-prime (NLL’) resummed cross-section for e+e- → 2 jets where one of the jets contains a B...
Mr
Zachariah Miller
(University of Illinois at Chicago; STAR)
1/13/16, 11:30 AM
Because of their large masses and long lifetimes, heavy quarks are dominantly produced from initial hard parton scattering processes and can experience the whole evolution of the Quark Gluon Plasma (QGP) created in high-energy heavy-ion collisions. For this reason, heavy quarks have been suggested as excellent probes of the properties of the QGP. Theoretical models based on existing data...
Dr
Marat Freytsis
(Harvard University)
1/13/16, 2:00 PM
Some of the most arduous and error-prone aspects of precision resummed calculations are related to the partonic hard process, having nothing to do with the resummation. In particular, interfacing to parton-distribution functions, combining various channels, and performing the phase space integration can be limiting factors in completing calculations. Conveniently, however, most of these tasks...
Dr
David Morrison
1/13/16, 3:00 PM
Prof.
Jianwei Qiu
(Brookhaven National Laboratory)
Production of heavy quarkonia is arguably one of the most fascinating subjects in strong interaction physics. It offers unique perspectives into the formation of QCD bound states. However, since the discovery of J/psi more than 40 years ago, theorists still have not been able to fully understand its production mechanism. In this talk, I will present recent new developments in understanding the...