Bulletin of the American Physical Society
2006 Division of Nuclear Physics Annual Meeting
Wednesday–Saturday, October 25–28, 2006; Nashville, Tennessee
Session 1WB: Pre-Meeting Workshop: Properties and Signatures of sQGP I |
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Sponsoring Units: DNP Chair: Julia Velkovska, Vanderbilt University Room: Gaylord Opryland Bayou B |
Wednesday, October 25, 2006 9:00AM - 9:40AM |
1WB.00001: New Developments in the Theory of Strongly Coupled Quark-Gluon Plasma Invited Speaker: The talk will review new developments and also connections to other strongly coupled systems in physics. One is to strongly coupled electromagnetic plasmas, which are usually studied numerically via molecular dynamics simulations. New studies of a plasma containing both electrically and magnetically charged particles will be shown. Another is to strongly coupled gauge theories studied via AdS/CFT correspondence to string theory. New results are numerous, they include heavy quark diffusion constant, jet drag force and even development of the conical flow. Finally, there is a connection to strongly coupled fermionic atoms; new results here include usage of universal relations between those and sQGP in a color superconductor domain. [Preview Abstract] |
Wednesday, October 25, 2006 9:40AM - 10:10AM |
1WB.00002: Collective Behavior in sQGP Invited Speaker: |
Wednesday, October 25, 2006 10:10AM - 10:40AM |
1WB.00003: What do jet correlation measurements tell us about the sQGP at RHIC-PHENIX? Invited Speaker: Jet correlations in relative azimuth provide a powerful tool to investigate the hot dense medium created in heavy-ion collisions at RHIC. Hard scattered partons traversing hot dense medium can lose energy before fragmenting into hadrons. Such an energy loss should result in significant modification to jet yields and shapes. PHENIX collected 0.24 nb$^{-1}$ Au+Au in year 2004 and 3.0 nb$^{-1}$ Cu+Cu data in year 2005 respectively, thus provide us an ideal place to do a systematic study on the evolution of jet properties as a function of transverse momentum, centrality, reaction plane orientation and colliding systems. We will present recent results from jet correlation measurement in PHENIX with an emphasis on the strong modification of away side jet shape in intermediate pT(2-4GeV/c) and on the suppression of away side jet yields in high pT($>$5GeV/c). Their implications about the hot dense medium will also be discussed. [Preview Abstract] |
Wednesday, October 25, 2006 10:40AM - 11:10AM |
1WB.00004: Coffee Break
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Wednesday, October 25, 2006 11:10AM - 11:40AM |
1WB.00005: Jet Energy Loss and Correlations from STAR Invited Speaker: |
Wednesday, October 25, 2006 11:40AM - 12:10PM |
1WB.00006: Heavy-quark energy loss in the QGP and non-photonic single-electron observables at RHIC Invited Speaker: I will give a general overview about our current theoretical understanding of the thermalization and flow of $c$- and $b$-quarks in a Quark-Gluon Plasma (QGP), as believed to be produced in ultra-relativistic heavy-ion collisions. First I will summarize the assessment of heavy-quark-energy loss in the medium through perturbative QCD. Recently, due to the experimental findings about the transverse-momentum ($p_T$) spectra and elliptic flow ($v_2$) of non-photonic single electrons ($e^{\pm}$) at the BNL Relativistic Heavy Ion Collider (RHIC), the importance of elastic quark rescattering in addition to the gluon-radiative processes for parton-energy loss has become evident. However, to explain the $e^{\pm}$ data the corresponding effects have to be enhanced by either tuning up the transport coefficient for quark-energy loss, $\hat{q}$, or the gluon density of the medium. Thus also non-perturbative effects have to be considered. We evaluate resonant elastic $c$- and $b$-quark rescattering as a non-perturbative mechanism for the thermalization of heavy quarks with the QGP. We describe the interactions of heavy quarks with light quarks within a field theory with light and heavy quarks as well as heavy-light meson resonances as effective degrees of freedom within the QGP. The model is based on chiral and heavy-quark symmetry, taking into account pseudo-scalar $D$ ($B$) and vector $D^*$ ($B^*$) mesons and their chiral partners. Within this model, we evaluate drag and diffusion coefficients to assess the flow properties of $c$- and $b$-quarks within the QGP, as produced in URHIC's, using a relativistic Langevin simulation. We find that the survival of the resonances at temperatures $T \alt 2 T_c$ ($T_c \simeq 180 \;\mathrm{MeV}$: critical temperature for the deconfinement transition) accelerates the equilibration of $c$- and (to less extent) $b$- quarks significantly compared to the use of perturbative-QCD elastic scattering processes only. Using the such obtained heavy-quark $p_T$-spectra and elliptic flow, $v_2$, we employ a coalescence model for hadronization to $D$- and $B$ mesons for the pertinent non-photonic electron observables and compare to the data from the PHENIX and STAR collaborations at RHIC. [Preview Abstract] |
Wednesday, October 25, 2006 12:10PM - 12:40PM |
1WB.00007: Heavy flavor production and interactions in the medium Invited Speaker: Measurements of high-pt hadron production in high energy collisions of heavy nuclei at the Relativistic Heavy Ion Collider (RHIC) have revealed strong suppression of the single-particle inclusive yield compared to elementary p+p collisions. The suppression is commonly thought to arise from partonic energy loss in dense matter due to induced gluon radiation, with its magnitude depending strongly on the color charge density of the medium. However, the sensitivity of light partons to the actual density of the medium is limited due to surface bias effects that lead to saturation of the suppression with density. Charm and bottom quarks are produced dominantly through initial high partonic interactions. Gluon radiation in a forward cone is suppressed for heavy quarks at moderate energy (dead cone effect). This reduces their medium-induced energy loss making heavy flavor, in principle, more sensitive to the properties of the medium. Measurements of heavy quark (charm and bottom) production therefore provide more stringent tests of the partonic energy loss mechanisms. Heavy flavor production at RHIC is studied via the measurement of D mesons and electrons from semileptonic decays of charm and bottom mesons. In this talk I review the experimental results from 200 GeV p+p, d+Au, and Au+Au collisions and discuss their implications on our understanding of the matter created at RHIC. [Preview Abstract] |
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