Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session KA: The Next Decade of Probing Hot and Dense Nuclear Matter |
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Chair: James Nagle, University of Colorado Room: Kona 5 |
Saturday, October 17, 2009 9:00AM - 9:45AM |
KA.00001: Collective Dynamics in High-Energy Nuclear Collisions at RHIC Invited Speaker: In this talk I will discuss recent results from RHIC and the implications for the formation of matter with partonic degrees of freedom. The focus will be on the collective properties. I will also discuss the future for the RHIC program specifically stressing the importance of both heavy flavor measurements and the search for the QCD critical point. Finally, I will emphasize that the combined efforts at LHC, RHIC and the future facilities FAIR and NICA, will allow us to study the structure of QCD matter at different states of excitation. [Preview Abstract] |
Saturday, October 17, 2009 9:45AM - 10:30AM |
KA.00002: Will We See a Perturbative QGP at the LHC? Invited Speaker: One of the major goals of relativistic nuclear collisions is to probe the deconfined state of matter, the quark-gluon plasma (QGP). More than two decades ago it has been suggested that suppression by color screening of quarkonium states could serve as a clear signal for deconfinement. Furthermore, the so-called melting pattern of the different heavy quark-antiquark bound states could serve as a thermometer for the QGP. In order to have qualitative, as well as quantitative control of these signals, it is thus important to have a solid theoretical understanding of the quarkonium properties in a high temperature environment. In this talk I discuss our current understanding that comes from first principle calculations, like perturbative QCD and lattice QCD, and from phenomenological potential models. Recently, it has become clear, that in the weak coupling limit, where perturbative calculations are applicable, the dominant medium effect that quarkonium states undergo is thermal broadening. I will address this question, together with the effects of screening by the hot deconfined medium. I also discuss the relevance of these findings for the upcoming LHC and upgraded RHIC experiments, where not only the ``traditional'' J/psi suppression, but the Upsilon measurements are of importance. In particular, at LHC, where much higher temperatures are expected to be reached, thermal broadening of the Upsilon in the weak coupling limit could be used to test the possibly weakly coupled nature of the produced QGP. [Preview Abstract] |
Saturday, October 17, 2009 10:30AM - 11:15AM |
KA.00003: Probing Dense Matter via Hadron Properties Invited Speaker: Hadron properties are expected to be modified in hot/dense matter as a consequence of the chiral symmetry restoration. Experimental studies on the modification of hadron mass in dense matter have been performed for the last two decades. The recent results of the experiments searching for the hadron mass modification in nuclear medium are reviewed. I will discuss in detail the KEK-PS E325 experiment reporting the modification of the invariant mass spectra of $\rho,\omega,\phi\rightarrow e^{+}e^{-}$ measured in p+A reactions. This presentation will also provide an outlook for the capability of the proposed experiments at J-PARC to investigate hadron properties in nuclear matter. The dilepton measurement will be performed to study the nuclear size and velocity dependence of the mass modification systematically. There are also programs to measure the vector mesons in nuclei in exclusive reactions. These different experimental methods will provide an opportunity to study meson properties in nuclear matter in many aspects. [Preview Abstract] |
Saturday, October 17, 2009 11:15AM - 12:00PM |
KA.00004: Theoretical perspectives of physics on relativistic heavy ion collisions Invited Speaker: Our knowledge of the hot QCD matter, the quark gluon plasma (QGP), has increased drastically since Relativistic Heavy Ion Collider (RHIC) started to operate at the beginning of this century. There are several major discoveries at RHIC such as large anisotropic flow coefficients and suppression of high $p_T$ hadrons. Among them, the reasonable agreement between elliptic flow coefficients from ideal hydrodynamics of the QGP expansion and experimental data leads to a new paradigm ``the strongly interacting QGP'' at RHIC. Here relativistic hydrodynamics plays an important role in interpretation of observables related with the QGP expansion. Hot QCD matter created in relativistic heavy ion collisions is highly dynamic and complex by its nature. Thus, the relation between theoretical calculations of equilibrium properties of the QCD matter and experimental observables demands dynamical modeling of various stages in relativistic heavy ion collisions. It is now being in transition from the discovery stage to the stage of precision studies. Moreover, establishment of a realistic, standard, and dynamical model could lead us to new discoveries yet to be known. The society now tries to go beyond the current qualitative understanding and aims at more quantitative studies to constrain properties of the QGP such as the equation of state, the transport coefficients, and the stopping power of the hot QCD matter. In this talk, I first overview the dynamical modeling to describe space-time evolution of the hot matter in relativistic heavy ion collisions. I next introduce several attempts towards more quantitative understanding of the hot QCD matter. Finally, I discuss the role of the dynamical modeling and theoretical issues in the upcoming LHC era. [Preview Abstract] |
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