Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session S10: Ultrarelativistic Heavy-Ions |
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Sponsoring Units: DNP Chair: Doga Gulhan, MIT Room: 250B |
Monday, April 18, 2016 1:30PM - 1:42PM |
S10.00001: Measurements of $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ polarization in p$+$p collisions at STAR Siwei Luo Measurements of $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ production cross section and polarization can help understand $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ production mechanism in hadron collisions and distinguish among different models. $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ polarization could be characterized by the $\lambda_{\theta }$, $\lambda_{\varphi }$and $\lambda _{inv}$ polarization parameters, where $\lambda_{\theta }$ and $\lambda _{\varphi }$ are coefficients of positron polar and azimuthal angle distribution in the $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ rest frame with respect to a chosen polarization axis, while $\lambda_{inv}$ is a frame-independent variable calculable from $\lambda_{\theta }$ and $\lambda_{\varphi }$. $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ polarization parameters $\lambda_{\theta }$, $\lambda_{\varphi }$and $\lambda_{inv}$ in both helicity and Collins-Soper frames have been extracted from the STAR 2011 data in p$+$p collisions at $\sqrt s =500$ GeV, while only $\lambda_{\theta }$ in the helicity frame has been extracted from the STAR 2009 data in p$+$p collisions at $\sqrt s =200$ GeV. In this talk, we will present a new analysis to study $\mathrm{J} \mathord{\left/ {\vphantom {\mathrm{J} \mathrm{\psi }}} \right. \kern-\nulldelimiterspace} \mathrm{\psi }$ polarization using the STAR 2012 data to extract $\lambda _{\theta }$, $\lambda_{\varphi }$and $\lambda_{inv}$ in both the helicity and Collins-Soper frames in p$+$p collisions at $\sqrt s =200$ GeV. [Preview Abstract] |
Monday, April 18, 2016 1:42PM - 1:54PM |
S10.00002: Heavy Quarkonia on the Light Front Yang Li, Guangyao Chen, Lekha Adhikari, Xingbo Zhao, Pieter Maris, James Vary We employ solutions for heavy quarkonium within a light-front basis function approach [1] to compare with experiment and predict additional observables. The Hamiltonian is based on the Light-Front Holographic QCD (phenomenological confinement) plus one-gluon exchange. Mass spectra agree well with experiment and we employ the wavefunctions to evaluate decay constants and form factors. We discuss our progress and plans for evaluating generalized parton distributions (GPDs) and cross sections for diffractive production. Our predictions for these observables as well as predictions of additional excited states can be tested at ongoing and future experimental facilities, e.g., LHC, sPHENIX and the EIC. [1] Y. Li, P. Maris, X. Zhao and J.P. Vary, arXiv: 1509.07212 [Preview Abstract] |
Monday, April 18, 2016 1:54PM - 2:06PM |
S10.00003: Factorial Moments and Intermittency in pp Collisions at $\sqrt{s}$ = 13 TeV Khadeejah Alghadeer, Lee Sawyer Charged-particle multiplicity dependence on transverse momentum, pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are presented for pp collisions at center of mass energy $\sqrt{s} = 13$ TeV with two different Monte Carlo event generators, Pythia 8 and Herwig++ 2.7.1, including studies of t ${t}'$ production. The results are achieved with charged particles with transverse momentum larger than 500 MeV and absolute pseudorapidity less than 3, in events with at least one charged particle, and in events at least six charged particles filling these kinematic requirements. In this paper, intermittency studys the distributions of particles and correlations of multiplicities of charged particles in one-dimensional phase space of rapidity is presented to analyze the dynamics of hadroproduction. Intermittency is an increase of factorial moments with decreasing bin size, where dynamical fluctuations are noticed. The dynamical correlations of many-particle systems are carried out at higher energies, where one cannot separate out lower-order correlations from higher-order correlations. The behavior of particle distributions call intermittent provide a strong test of QCD. [Preview Abstract] |
Monday, April 18, 2016 2:06PM - 2:18PM |
S10.00004: Probing proton fluctuations with asymmetric rapidity correlations Kevin Dusling, Adam Bzdak Intrinsic fluctuations of the proton saturation momentum generate asymmetric rapidity distributions on an event-by-event basis. We argue that the asymmetric component, $\left |
Monday, April 18, 2016 2:18PM - 2:30PM |
S10.00005: Light-front time evolution in intense fields Guangyao Chen, Xingbo Zhao, Yang Li, Pieter Maris, Kirill Tuchin, James Vary We report on the influence of strong electromagnetic fields generated by an ultra-relativistic heavy ion on the quantized field of a charged fermion particle using the time-dependent basis light-front quantization (tBLFQ) approach. We calculate transitions of the charged fermion and find agreement with light-front perturbation theory at small coupling. We then present non-perturbative effects, such as the real-time evolution of the momentum distribution and the helicity configuration of the fermion in strong fields. We will discuss prospects for applying the tBLFQ formalism to time-dependent QED and QCD fields in heavy ion collisions and electron-ion collisions. [Preview Abstract] |
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