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 2WB: Workshop 2B: Strongly Interacting Matter Probed at RHIC |
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Sponsoring Units: DNP JPS Chair: Tetsuo Hatsuda, University of Tokyo Room: Ritz-Carlton Hotel Salon 3 |
Sunday, September 18, 2005 2:00PM - 2:30PM |
2WB.00001: Jet Quenching Puzzles at RHIC Invited Speaker: Jet quenching is a unique short wavelength probe of the strongly coupled quark gluon plasma (sQGP) produced at RHIC. Recent data on the azimuthal dependence of jet quenching as a function of centrality and on heavy quark attenuation patterns at high transverse momenta have posed interesting new challenges for jet tomography theory[1]. Prediction for (Au+Au and Cu+Cu) will be confronted with the available data. Possible new physics implications of the outstanding puzzles will be discussed. [1] M.~Gyulassy, I.Vitev, X.~N.Wang and B.W.Zhang, Quark gluon plasma III, (Hwa, R.C. (ed.) et al.,p.123), (nucl-th/0302077) [Preview Abstract] |
Sunday, September 18, 2005 2:30PM - 3:00PM |
2WB.00002: High-pt particle production and its modifications in nucleus-nucleus collisions at RHIC Invited Speaker: One of the most striking results from RHIC is the strong suppression of high-pt particle production observed in nucleus-nucleus collisions. Di-hadron correlations of high-pt particles clearly demonstrate that these particles originate from fragmentation of high-pt partons and that these particles are strongly absorbed by the hot and dense medium in central Au+Au collisions. I will review the relevant results on particle spectra, nuclear modification factor, elliptic flow and di-hadron correlations at high-pt with focus on the new results from the high-statistics RHIC run 4 which have significantly reduced statistical uncertainties and cover a larger range in pt than the existing results. RHIC has also recorded Cu+Cu collisions at 200 GeV this year, to systematically explore the path-length and system size dependence of the observed suppression. If available, first results from this run will also be discussed. [Preview Abstract] |
Sunday, September 18, 2005 3:00PM - 3:30PM |
2WB.00003: Jets and Single Charm Production at RHIC Invited Speaker: Heavy quarks are powerful probes that are being used to characterize the state of matter created in heavy ion collisions at RHIC. The behavior of the charm and beauty quarks in HI collisions has been predicted to be quite different than that of the light quarks. The charm quark energy loss was expected to be smaller than that for light quarks, due to its heavy mass. Azimuthal anisotropy of the charmed hadrons was also expected to be less than that for the hadrons made of light quarks due to the limited thermalization of heavy quarks. Experiments at RHIC are conducting systematic studies of transverse momentum spectra of open charm, azimuthal anisotropy of heavy flavor hadrons and correlations between single leptons and jets from charm in A+A collisions. In addition measurements of heavy quark production in p+p and d+Au collisions have been carried out at RHIC to address the separation of physics associated with the hot, dense medium created in RHIC A+A collisions from non-pQCD processes such as cold nuclear effects. We present results from heavy quark studies covering particle production, transverse momentum distributions vs centrality, azimuthal anisotropy and jet correlations in p+p, d+Au and Au+Au collisions at RHIC. [Preview Abstract] |
Sunday, September 18, 2005 3:30PM - 4:00PM |
2WB.00004: Measurements of J/$\Psi$ and photons at RHIC Invited Speaker: Recent results on measurements of J/$\Psi$ and photons are reported. In spite of fruitful results in the first four years of RHIC operation, there are still remaining questions to be answered to further characterize the state of matter formed at RHIC. In particular, direct information of deconfinement of quarks and gluons and of the dense matter produced has not been obtained, and should be provided. From this point of view, electro-magnetic probes are important. They created in the medium, and emerge from the matter without strong final state interaction. Thus, they carry direct information about conditions and properties of the medium. Especially, direct photons and lepton decays of J/$\Psi$ are unique observables. They allow direct access to the initial state of the collision and information of deconfinement. The $J/\Psi$ yield is considered to be one of the most promising probes of deconfined matter, since theoretical models predict that the $J/\Psi$ yield could be suppressed due to the color Debye screening effect in QGP. On the other hand, recent theoretical efforts shows the possibility of the $J/\Psi$ yield increasing due to the coalescence of uncorrelated $c$ and $\bar {c}$ quarks. Also, a cold nuclear effects, such as nuclear absorption, may affect the final $J/\Psi$ yield. Thus, the detailed study of $J/\Psi$ yield in several kinds of collisions is important. We present the latest results of $J/Psi$ invariant yield and $J/Psi$ pT distribution obtained by using its lepton decay mode in p+p, d+Au, and Au+Au collisions at RHIC. In addition to information from $J/Psi$ measurements, information from photon measurements is obtained at RHIC. the PHENIX discovery of a large photon excess over the meson-decay background in central Au+Au collisions at high pT confirms the final-state nature of the high-pT hadron suppression previously observed. We present a systematic study of direct photon production in p+p, d+Au, and Au+Au collisions. [Preview Abstract] |
Sunday, September 18, 2005 4:00PM - 4:30PM |
2WB.00005: Color Glass Condensate and its implication Invited Speaker: I will briefly explain the basic concepts behind the physics of Color Glass Condensate (CGC), which appears as the universal state of hadrons and nuclei in very high-energy scatterings. The CGC is made of high density gluons which have only a small franctions of the total momentum, and is characterized by coherent strong gauge fields. Its density is saturated (typically of the order of $1/\alpha_s$), which is induced by recombination process of two gluons into one (that is relevant when the gluon density is high). Theoretically, the CGC can be described by the weak-coupling technique since the typical transverse momentum of gluons, ``saturation momentum,'' $Q_s$ becomes large enough at high energies. I will also discuss some phenomenological implications of the CGC picture to the RHIC experiments. [Preview Abstract] |
Sunday, September 18, 2005 4:30PM - 5:00PM |
2WB.00006: The Future of High Energy Density Nuclear Physics at RHIC Invited Speaker: Brookhaven's Relativistic Heavy Ion Collider (RHIC) is the world's premier machine for the study of nuclear matter at extremely high energy density. RHIC has been in operation for five years and its experimental program has made discoveries that transform our understanding of strongly interacting matter at high energy density. From this new understanding compelling questions can be asked about the nature of QCD (e.g., confinement, chiral symmetry breaking, hadronization, etc.). I will discuss the plans to address these questions in the context of the future development of RHIC. [Preview Abstract] |
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