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 JA: Exploration of New State of Dense Matter |
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Sponsoring Units: DNP JPS Chair: S.V. Greene, Vanderbilt University Room: Ritz-Carlton Hotel Salon 4 |
Thursday, September 22, 2005 9:00AM - 9:45AM |
JA.00001: Probing the QGP at RHIC: Lessons and Challenges Invited Speaker: Recent data taken at the Relativistic Heavy-Ion Collider has provided strong evidence for the creation of a strongly interacting deconfined phase of quarks and gluons, often referred to as the strongly coupled Quark-Gluon-Plasma (sQGP). In the first part of my talk I will highlight the major findings which have lead to the discovery of the sQGP. However, the quantitative analysis of sQGP properties and their connection to QCD at high energy density is still in its infancy. The second part of my talk will focus on the key challenges faced by QGP theory in characterizing the bulk properties and dynamical evolution of the sQGP phase. In particular I will discuss success, limitiations and future perspectives of the hydrodynamic model, parton recombination as standard model of hadronization, and recent transport theory calculations on photons and electromagnetic probes. [Preview Abstract] |
Thursday, September 22, 2005 9:45AM - 10:30AM |
JA.00002: Hadronic probes of dense matter at RHIC: from light to heavy flavors Invited Speaker: A new state of dense matter has been discovered in collisions of heavy nuclei at RHIC. The matter is characterized by extremely high density, very rapid thermalization, and strong collective flow. The discovery is mainly based on an extensive set of measurements such as particle ratios, momentum distributions and elliptic flow patterns of light flavored hadrons. New measurements of heavy quarks (charm and beauty) at RHIC will start shedding additional new light on the property of the matter. Due to their much larger mass, heavy quarks can interact with the dense medium in a way very different from light quarks. Therefore heavy quark measurements will provide new information on the property of the matter. In this talk, I review the present status and future prospect of the study of the dense matter at RHIC through hadronic probes of light and heavy flavors with emphasis of the new data of heavy flavor measurements at RHIC. [Preview Abstract] |
Thursday, September 22, 2005 10:30AM - 11:15AM |
JA.00003: Heavy flavor and direct photon measurements at RHIC Invited Speaker: RHIC energies and luminosities are sufficiently high that, for the first time, elementary partonic processes at high $Q^{2}$ take place within heavy-ion collisions at substantial rates. The products of these elementary scatterings will then form well-defined, high-momentum QCD objects that will already exist when an excited medium is created in the space surrounding them. As they then propagate, their interactions will probe the created medium from its very earliest stages. Among the key studied QCD objects are the following, described by their speed through the medium, multiplet and the associated observables: ``Slow''/Heavy flavor: color triplet for open charm and bottom production, color octet/singlet for heavy quarkonia via lepton pairs. ``Fast''/Prompt direct photons: color-less, studied with isolated high pT photons. To distinguish novel behaviour from competing normal nuclear effects it is very important to systematically measure the production for several collision species, energies and as a function of centrality and rapidity. An overview of heavy flavor and prompt direct photon results obtained to date at RHIC will be presented. [Preview Abstract] |
Thursday, September 22, 2005 11:15AM - 12:00PM |
JA.00004: Jets at RHIC: The intersection of high-energy and nuclear physics Invited Speaker: 30 years ago, the observation of streams of high transverse momentum ($p_T$) particles (jets) from fragmenting partons produced in high energy proton collisions helped to uncover the parton substructure of hadrons. In high energy heavy-ion collisions, jets have emerged as a tomographic tool of the hot and dense matter formed in the collision. Bjorken first suggested that jets might be suppressed in nuclear collisions, due to energy loss of the outgoing parton traversing the dense medium. At RHIC jets have been studied via azimuthal correlations of high-$p_T$ hadrons, and a series of correlation measurements that support the energy loss picture has provided strong evidence for the predicted phase of partonic matter at high energy densities. I will present an overview of jet and di-jet measurements at RHIC, emphasizing new studies of azimuthal correlations that provide strong constraints on the nature of the medium formed in the collision. I will also discuss future directions of jet studies, both at RHIC and at LHC, where a substantial increase in collision energy will open up a new frontier of jet physics in nuclear collisions. [Preview Abstract] |
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