Bulletin of the American Physical Society
2012 Fall Meeting of the APS Division of Nuclear Physics
Volume 57, Number 9
Wednesday–Saturday, October 24–27, 2012; Newport Beach, California
Session JB: Mini-Symposium on Energy/Geometry Dependence of Relativistic Heavy Ion Collisions II |
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Chair: Anthony Frawley, Florida State University Room: Plaza II |
Friday, October 26, 2012 10:30AM - 10:42AM |
JB.00001: $\pi^{0}$ production in Cu+Au at PHENIX Sarah Campbell Recent $\sqrt{s_{NN}}$ = 200 GeV Cu+Au collisions at RHIC provide a new system to study collision dynamics using high $p_{T}$ $\pi^{0}$ production at mid-rapidity at PHENIX. The asymmetric Cu+Au collisions create unique initial-state collision geometries including odd harmonics beyond fluctuations and very central events where the Cu nucleus is embedded in the Au nucleus. The reaction plane dependence of $\pi^{0}$s allows us to probe different core-corona regions in these very central events, and to study the path length dependence of energy loss with different initial geometries. PHENIX has measured the suppression of $\pi^{0}$s with respect to reaction plane in 200 GeV Au+Au collisions and found it consistent with a cubic path length dependence, suggesting a non-perturbative energy loss model. The status of the Cu+Au $\pi^{0}$ analysis will be presented and compared with PHENIX Au+Au results. [Preview Abstract] |
Friday, October 26, 2012 10:42AM - 10:54AM |
JB.00002: Dimuon Production in Cu+Au Collisions in PHENIX Ming Liu We study for the first time the open heavy quark and Drell-Yan production in the forward (Cu going) and backward (Au going) directions in asymmetric Cu+Au collision through dimuon measurements at a center of mass energy of $\sqrt{s_{NN}}=200$ GeV. We expect heavy quark production is sensitive to final state parton energy loss in QGP while Drell-Yan is more sensitive to the initial state effects. During the latest 2012 run, the PHENIX experiment at RHIC has collected 5 nb$^{-1}$ Cu+Au collisions data with the new Forward Silicon Vertex Detectors (FVTX). FVTX detectors cover the whole PHENIX muon arm acceptance and significantly improve the physics reach of the muon probe for the QGP study. We present the latest status of dimuon measurements in Cu+Au collisions with the FVTX in the rapidity range of $1.2< |\eta| < 2.4$ in the PHENIX experiment. [Preview Abstract] |
Friday, October 26, 2012 10:54AM - 11:06AM |
JB.00003: Constraining properties of strongly interacting matter using CHIMERA Irakli Garishvili, Betty Abelev, Andrew Glenn, Ron Soltz More then a decade of fascinating experimental measurements at RHIC and the LHC, and recent theoretical developments have lead to a much better understanding of the essential properties of strongly interacting matter believed to be produced in relativistic heavy ion collisions. However, these properties, in particular, ratio of shear viscosity to entropy density, \textit{eta}/s, and initial temperature, $T_{init}$, has not been yet constrained. To address this challenge we have developed CHIMERA, Comprehensive Heavy Ion Model Reporting and Evaluation Algorithm, a framework designed to facilitate global statistical comparison of results from our multi-stage hydrodynamics/hadron cascade model of heavy ion collisions to the key soft observables (spectra, elliptic flow, HBT) measured at RHIC and the LHC. Within this framework the data representing multiple different measurements from different experiments are combined into single format. A unique feature of CHIMERA is, that in addition to taking into account statistical errors, it also treats different types of systematic uncertainties. The hydrodynamics/hadron cascade model used in the framework incorporates different initial state conditions, pre-equilibrium flow, the UVH2+1 viscous hydro model, Cooper-Frye freezeout, and the UrQMD hadronic cascade model. The sensitivity of the observables to the equation of state (EoS) is explored using several EoS's in the hydrodynamic evolution. The latest results from CHIMERA, including most recent analysis of the LHC data, will be presented. [Preview Abstract] |
Friday, October 26, 2012 11:06AM - 11:18AM |
JB.00004: ABSTRACT WITHDRAWN |
Friday, October 26, 2012 11:18AM - 11:30AM |
JB.00005: Heavy quark potential at non-zero temperature and quarkonium spectral functions Peter Petreczky I calculate different types of Wilson loops of temporal size t $<$ 1/T at non-zero temperatures on the lattice using Highly Improved Staggered Quark (HISQ) action and temporal extent Nt=8 and 12. Unlike other static correlators which go around the periodic boundary these Wilson loops are not related to the free energy of static quark anti-quark pair. Therefore from the analysis of the Wilson loop I extract the real part of the heavy quark potential. I find that the extracted potential is systematically larger than the singlet free energy calculated on the lattice. At T $>$ 200MeV we supplement the calculated real part of the potential with the imaginary part obtained in perturbation theory and evaluate the quarkonium spectral functions. I find that all quarkonium states except the Upsilon(1S) melt at temperatures T $>$ 300MeV. [Preview Abstract] |
Friday, October 26, 2012 11:30AM - 11:42AM |
JB.00006: Hydrogen-like Atoms as Angstrom-scale Muon detectors Agnes Mocsy, Mauricio Martinez Guerrero We estimate the number of different exotic hydrogen-like atoms produced in relativistic heavy-ion collisions at RHIC and the LHC. WE argue that such atoms can be thought of as Angstrom-scale muon detectors, allowing one to unveil the shine of the quark-gluon plasma that is buried in the background, by inferring the single lepton spectra where direct measurements are not feasible. [Preview Abstract] |
Friday, October 26, 2012 11:42AM - 11:54AM |
JB.00007: Measurement of pion, kaon, and proton spectra in Cu+Au collision at 200GeV at PHENIX Brennan Schaefer The Relativistic Heavy Ion Collider at Brookhaven National Lab allows nuclear matter to be studied at extremely high temperatures and energy densities. The flexibility of RHIC to collide asymmetric nuclei such as Cu+Au at 200GeV can provide a controlled asymmetry in geometry and density both in the transverse and longitudinal plane, allowing us to systematically investigate the effects of initial geometry and density on particle production. The work in progress for measurement of the identified pion, kaon, and proton spectra as a function of centrality and over a wide transverse momentum range will be presented in the talk. The nuclear modification factor ($R_{AB})$ and particle ratios such kaon/pion, proton/pion, and antiproton/proton will also be studied and compared with other collision systems such as d+Au, Cu+Cu, and Au+Au. [Preview Abstract] |
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