Bulletin of the American Physical Society
2005 2nd Joint Meeting of the Nuclear Physics Divisions of the APS and The Physical Society of Japan
Sunday–Thursday, September 18–22, 2005; Maui, Hawaii
Session 1WB: Workshop 2A: Strongly Interacting Matter Probed at RHIC |
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Sponsoring Units: DNP JPS Chair: Huan Huang, University of California-Los Angeles Room: Ritz-Carlton Hotel Salon 3 |
Sunday, September 18, 2005 9:00AM - 9:30AM |
1WB.00001: A NEARLY PERFECT INK: The strongly coupled quark-gluon plasma at RHIC Invited Speaker: The first three years of operation of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven have taught us that collisions of two gold nuclei produce rapidly equilibrating matter, which flows almost like an ideal fluid, is opaque to hard partons, and shines brightly in baryons. I will discuss the implications of these results in the context of what we know about the properties of hot, strongly interacting matter. I will also outline (some of) the problems which await a theoretical explanation. [Preview Abstract] |
Sunday, September 18, 2005 9:30AM - 10:00AM |
1WB.00002: Hadron Spectra and Flow at Intermediate pT Invited Speaker: Measurements of identified particles from Au+Au collisions at various center-of-mass energies are reviewed. Emphasis is placed on hadron spectra, baryon-to-meson ratios, and elliptic flow at intermediate transverse momentum ({\$}1.5 $<$ p{\_}T $<$ 5{\$} GeV/c). Possible connections between these measurements and the creation of a deconfined quark-gluon phase are presented. [Preview Abstract] |
Sunday, September 18, 2005 10:00AM - 10:30AM |
1WB.00003: Recent Results on Strangeness and Exotics at RHIC Invited Speaker: I will give a brief overview on strangeness production at RHIC. Yields and spectra of strange hadrons have been measured as a function of centrality in 200 GeV AuAu, dAu, and CuCu collisions as well as in pp events. Thus, system size effects on strange particle production and their kinematics, such as flow and the nuclear modification factors, R(CP), can be studied. The excitation function of these variables in AuAu collisions at 62 and 130 GeV will be discussed together with measurements from the AGS and SPS. In particular the R(CP) at lower energies can test the energy and centrality dependence of partonic energy loss and quark recombination models. Short-lived resonances which may decay and regenerate in the medium are used to examine the medium's dynamical evolution between particle production and thermal freeze-out. Next-to-leading order (NLO) pQCD calculations show interesting deviations from the measurements of strange baryon and meson spectra in RHIC pp collisions but describe the kinematics of $\pi $ rather well. By comparing the strangeness data to tuned PYTHIA and new NLO calculations, we can begin to determine the contributions from individual flavors to the fragmentation process in pp. Correlation studies with K$^{0}$, $\Lambda $, and Anti-$\Lambda $ in pp, dA, and AA collisions have been made to probe modifications of this fragmentation process by the medium. I also present the latest status on the search for exotica, such as strangelets and penta-quarks, at RHIC. [Preview Abstract] |
Sunday, September 18, 2005 10:30AM - 11:00AM |
1WB.00004: Hadron Spectra at Mid and Forward Rapidities Invited Speaker: BRAHMS has measured transverse momentum spectra for identified charged hadron in the (pion) rapidity range 0$<$y$<$4 for p+p, d+Au, Cu+Cu, and Au+Au collisions at 200GeV, as well at 62.4 GeV for the two heavy symmetric systems. Such results give information on both the longitudinal and transverse dynamics of the emitting source. The foci of this talk will be nuclear stopping as a function of beam energy as measured via net-proton distributions and the rapidity behavior of transverse flow via the ``blast-wave'' formalism. [Preview Abstract] |
Sunday, September 18, 2005 11:00AM - 11:30AM |
1WB.00005: Probing Strongly Interacting Matter with the Measurement of Flow, HBT, and Spectra over a Wide Rapidity Invited Speaker: Recently a general consensus has developed amongst the four experiments at RHIC and the theoretical community that mid-rapidity measurements of Au+Au central collisions at ${\rm \sqrt{s_{NN}}}$ = 200 GeV point toward the creation of strongly interacting matter with extraordinarily high energy density. Jets formed from high-energy quarks and gluons are absorbed by this matter and produced particles tend to move collectively in response to variations of pressure across the volume. Until recently, however, the rapidity dependence of many of the RHIC results has not been well explained by any models. A systematic array of charged particle, flow, HBT, and spectra results are now available over a broad range of rapidity at RHIC for a variety of collision energies from a variety of systems, including Cu+Cu, Au+Au and d+Au. Furthermore, hydrodynamic models are becoming more sophisticated. The latest results from RHIC will be presented in this context and the theoretical implications will be explored. [Preview Abstract] |
Sunday, September 18, 2005 11:30AM - 12:00PM |
1WB.00006: Hydrodynamic approaches to RHIC physics Invited Speaker: One of the most intriguing findings in the experiments at Relativistic Heavy Ion Collider (RHIC) in Brookhaven National Laboratory (BNL) is a large magnitude of momentum anisotropy in comparison with the ones observed at lower collision energies. The momentum anisotropy in noncentral collisions is characterized by the second Fourier coefficient $v_2$ of the azimuthal distribution for observed particles. The magnitude of $v_2$ and its transverse momentum $p_T$ dependence for identified hadrons are comparable with results from \textit{ideal} hydrodynamic simulations around midrapidity ($\mid \eta \mid <\sim 1$), in low transverse momentum region ($p_T <\sim 1$ GeV/$c$), and up to semicentral collisions ($b < \sim 5$ fm). This is evidence for a recent announcement of the discovery of the perfect fluidity in the strongly coupled/interacting quark gluon plasma (sQGP) as distinct from the weakly coupled/interacting QGP (wQGP) which had been assumed to be created for a long time. Though the ideal hydrodynamic description at RHIC is apparently successful, this in turn raises a couple of new questions about hydrodynamic behavior of bulk matter produced in relativistic heavy ion collisions. In this talk, I will present current understanding of matter produced at RHIC and discuss open issues in modeling dynamics of relativistic heavy ion collisions based on hydrodynamics. [Preview Abstract] |
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