Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session JF: Mini-symposium on Cold Nuclear Matter from Fixed-Target Energies to the LHC IIMini-Symposium
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Chair: Donald Isenhower, Abiliene Christian University Room: Pavilion Ballroom A |
Saturday, October 15, 2016 10:30AM - 10:42AM |
JF.00001: Overview and interprations of centrality-dependent high-pT jet production measurements at RHIC and the LHC Dennis Perepelitsa Measurements of jet production at large transverse momentum in proton- and deuteron-nucleus collisions have traditionally been understood as a valuable way to probe the partonic content of the dense nucleus and to constrain the magnitude of energy loss in the cold nuclear environment. Recent results on the inclusive production of reconstructed jets at mid-rapidity at RHIC and over a wide rapidity range at the LHC show that jet rates are minimally modified with respect to the scaled proton-proton cross-section. On the other hand, jet rates at both colliders were found to have a highly anomalous relationship to the soft particle-based observables traditionally interpreted as an indirect handle of the collision geometry. Furthermore, analysis of the kinematics- and collision-energy-dependence of these modifications reveal that they have a surprising dependence on the Bjorken-x of the hard-scattered parton in the colliding proton or deuteron, and not on that in the nucleus. This observation has inspired novel interpretations of the origin of this effect. In this talk, I will present a summary of the relevant data and theoretical ideas. [Preview Abstract] |
Saturday, October 15, 2016 10:42AM - 10:54AM |
JF.00002: ABSTRACT WITHDRAWN |
Saturday, October 15, 2016 10:54AM - 11:06AM |
JF.00003: Studies of Underlying-Event Activity in Proton+Proton Collisions by STAR Li Yi Underlying-event activity originates from the soft particle production in proton+proton collisions which is not directly related to the final fragmentation of hard-scattered partons. Underlying-event measurements therefore provide a tool to study non-factorizable and non-perturbative phenomena. Systematic measurements of the relationship between the underlying event and jet processes are therefore essential to disentangle initial state nuclear effects from cold nuclear matter effects and jet quenching. Moreover, the underlying event results in a background contribution that needs to be carefully analyzed when interpreting the measurements of inclusive jet cross sections and longitudinal asymmetries. In this talk, we will discuss the progress of underlying-event measurements in proton+proton collisions by STAR. [Preview Abstract] |
Saturday, October 15, 2016 11:06AM - 11:18AM |
JF.00004: A Study of Nuclear effects in Drell-Yan and Charmonia Productions in p-A collisions at Fermilab E906/SeaQuest Experiment Ming Liu Strong suppressions of charmonia have been observed in heavy ion collisions at RHIC and LHC. The suppressions exhibit strong nucleus A and kinematic dependences, especially with Feynman-x/rapidity and transverse momentum pT. Such suppression in heavy ion collisions is predicted to be an important signature for the formation of quark-gluon plasma (QGP) due to color screening, however, there are also other non-QGP effects, such as initial state parton energy loss, parton shadowing and final state breakup. It is important to quantify the contributions from the cold nuclear matter, which could be achieved through studying charmonia and Drell-Yan productions in proton-nucleus collisions where no significant QGP is expected. E906/SeaQuest is a fixed-target dimuon experiment at Fermilab using the 120 GeV proton beam from the Main Injector. E906 has been taking high statistic data samples of p+p, p+d, p+C, p+Fe and p+W collisions since 2014 and will continue data taking until the summer of 2017. E906 measures $J/\psi, \psi’$ and Drell-Yan productions in the dimuon channel in p+p and p+A collisions over a wide range of kinematic coverage, that is optimal for the study of the cold nuclear matter effects. Recently, we released the first preliminary results will be presented. [Preview Abstract] |
Saturday, October 15, 2016 11:18AM - 11:30AM |
JF.00005: $e^+e^-$ pairs from open heavy flavor in $p$$+$$p$ and $d$$+$Au collisions at $\sqrt{s_{_{NN}}}$ = 200~GeV Yue Hang Leung The dielectron mass spectrum is a unique probe
to directly access the different stages of a heavy-ion
collision. The intermediate ($1< m_{e^+e^-}<3$
GeV/$c^2$) and high ($4 |
Saturday, October 15, 2016 11:30AM - 11:42AM |
JF.00006: Study of cold-nuclear-matter effects on B-meson production at forward and backward rapidity with the PHENIX FVTX Sanghoon Lim PHENIX forward silicon vertex detector (FVTX) was installed in 2012. The FVTX provides precise tracking to distinguish between prompt $J/\psi$ and $J/\psi$ from $B$ decays by measuring the displacement of single muons from primary vertex position. This measurement is a clean probe to access $B$ production down to low $p_T$. PHENIX has collected a large statistics of $p+p$ and $p+{\rm Au}$ collision data at $\sqrt{s_{NN}}=200~{\rm GeV}$ in 2015. The $B\to J/\psi$ measurements at forward and backward rapidity with these data sets will be used to study cold-nuclear-matter effects on $B$ production. The performance of the FVTX in the 2015 run and the current status of $B\to J/\psi$ analysis will be presented. [Preview Abstract] |
Saturday, October 15, 2016 11:42AM - 11:54AM |
JF.00007: The EMC Effect at SeaQuest Michael Daugherity The Fermilab E906/SeaQuest experiment measures dimuons from 120 GeV protons from the Main Injector incident on fixed Hydrogen and Deuterium liquid targets and W, C and Fe solid targets. The yield of these dimuons from Drell-Yan (DY) process and charmonia states is extremely sensitive to the quark structure of nuclei, particularly the light antiquark sea. In 1983 the European Muon Collaboration (EMC) discovered a modification of quark momentum distributions from free nucleons to bound nuclei which has since been well explored in DIS. The DY cross-section ratios of solid to deuterium targets directly measures the nuclear effects of the sea quarks which can distinguish between various models of the nuclear parton distributions and complements DIS results. Recent results will be presented of SeaQuest’s measurements of the EMC Effect in the $0.1 |
Saturday, October 15, 2016 11:54AM - 12:06PM |
JF.00008: Parton Distributions in High Density Nuclear Matter. Misak Sargsian We investigate the modification of parton distributions in the nuclear medium in the density domain defined by short range multi-nucleon correlations(SRC). Special emphasis is given on the implication of the recently found dominance of proton-neutron SRCs on generation of flavor dependence in the modification of nuclear partonic distributions. Such a flavor dependence can have measurable impact on parity violating lepton-nuclear deep inelastic scattering and can explain the origin of NuTeV anomaly. [Preview Abstract] |
Saturday, October 15, 2016 12:06PM - 12:18PM |
JF.00009: The EMC effect of Nuclear Matter with Coulomb Corrections Shujie Li, Patricia Solvignon, John Arrington, Dave Gaskell Extraction of the EMC effect for nuclear matter is of great interest since it allows comparison to theoretical calculations in a regime where "exact" nuclear wave functions can be used. Earlier extractions from (e,e’) cross sections ignored the contribution of the Coulomb distortion, which can be approximated as an electron energy shift on the order of MeV. Though small, this shift can cause a noticeable change in cross sections in certain kinematic regimes. In this study, we applied Coulomb corrections on the per-nucleon ratios from the published SLAC E139 data and preliminary JLAB E03-103 data. I will show preliminary results for an extrapolation of the EMC ratios from finite nuclei to symmetric nuclear matter, including Coulomb Corrections and examining the sensitivity to different approximations for the nuclear density. The data from two experiments will also be combined to study the nuclear dependence of $R=\sigma_L/\sigma_T$. [Preview Abstract] |
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