Bulletin of the American Physical Society
2007 Annual Meeting of the Division of Nuclear Physics
Volume 52, Number 10
Wednesday–Saturday, October 10–13, 2007; Newport News, Virginia
Session JB: Mini-Symposium on DiJets and Correlations in Heavy Ion Collisions II |
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Chair: Tim Hallman, Brookhaven National Laboratory Room: Newport News Marriott at City Center Grand Salon III |
Saturday, October 13, 2007 2:00PM - 2:36PM |
JB.00001: Probing the QGP Structure at RHIC with Jet-Medium Correlations Invited Speaker: The study of di-jet production and multi-particle correlations involving at least one hard particle has developed into an important tool for probing the properties of the QGP produced at RHIC. In the first part of my talk I will focus on how jet-medium correlations, such as the azimuthal dependence of jet energy-loss can help constrain the various approaches used to describe jet-medium interactions (i.e. BDMPS, Higher Twist and AMY). In the second part of my talk I will study the interactions of jets with turbulent color fields and their implications for observables at RHIC: The near-side distribution of particles at intermediate transverse momentum, associated with a high momentum trigger hadron, is broadened in rapidity compared with the jet cone. This broadened distribution is thought to contain the energy lost by the progenitor parton of the trigger hadron. I will show that the broadening can be explained as the final-state deflection of the gluons radiated from the hard parton inside the medium by soft, transversely oriented, turbulent color fields that arise in the presence of plasma instabilities. The magnitude of the effect is found to grow with medium size and density and diminish with increasing energy of the associated hadron. [Preview Abstract] |
Saturday, October 13, 2007 2:36PM - 2:48PM |
JB.00002: Azimuthal anisotropy of charged hadrons in Au+Au and Cu+Cu collisions at RHIC Michael Issah The azimuthal anisotropy in particle emission is an important probe for the early dynamics of heavy-ion collisions. At RHIC, it has been well described by hydrodynamic models for transverse momenta below $\sim$ 2 GeV/c. Recombination models have been invoked to explain the baryon/meson difference and the unexpectedly high strength of the signal at intermediate $p_T$. At high $p_T$, the azimuthal asymmetry in the particle spectra can be attributed to jet quenching. The PHENIX Collaboration has recorded high statistics Au+Au and Cu+Cu collisions at center-of-mass energies in the range 62.4-200 GeV. The azimuthal anisotropy of charged hadrons obtained over a broad $p_T$ range will be presented and discussed. In particular, results from a cumulant analysis will be compared to the standard reaction plane method of flow analysis. [Preview Abstract] |
Saturday, October 13, 2007 2:48PM - 3:00PM |
JB.00003: Multi-hadron correlations for jet-studies at RHIC Martin Andrews Ultra-relativistic heavy-ion collisions provide a unique environment for the experimental study of a de-confined partonic medium not seen in more elementary (e.g. pp and d+Au) collisions. Modification of jet-like shapes observed via azimuthal di-hadron correlations in central Au+Au collisions gave rise to theoretical investigation of various jet-quenching scenarios as a possible explanations of jet-medium interactions (Cherenkov gluon radiation, mach-cone shock waves, and others). We use a new three-particle correlation technique to select di-jet events in ultra-relativistic Au+Au collisions and explore jet production, fragmentation and jet energy loss mechanisms in the dense medium created in such collisions at RHIC. Jet shapes and yields extracted from di-hadron jet-axis projections in three-particle correlations for Au+Au events of various centralites are compared to those measured in pp and d+Au events and a simple two-component model is used to visualize potential effects of energy loss. [Preview Abstract] |
Saturday, October 13, 2007 3:00PM - 3:12PM |
JB.00004: Fast Partons as a Source of Energy and Momentum in a Thermal Quark Gluon Plasma Richard Neufeld An interesting problem in the study of quark gluon plasma (QGP) physics is to determine the effect of fast partons on the bulk behavior of the evolving medium. Recent experimental results supporting the possible formation of a mach cone make this problem all the more relevant. One promising approach to determine the influence of a fast parton on an evolving QGP is to treat the energy and momentum deposited by the parton as a perturbation on the bulk hydrodynamic equations governing the system. I will present results for such a perturbative source term calculated in the context of a Vlasov-Boltzmann evolution. [Preview Abstract] |
Saturday, October 13, 2007 3:12PM - 3:24PM |
JB.00005: Positive and negative 2- and 3-particle correlations: what about hadron-proton correlation? Guoliang Ma Multi-particle (2- and 3-) azimuthal correlation is thought as
a good probe to explore the properties of
strongly interacting partonic matter in central Au+Au
collisions at RHIC. Especially, 3-particle correlation has
a great potential to identify the production mechanism(s) of
observed Mach-like correlation. Different from the
previous analysis on multi-particle correlation between charge
trigger and associated hadrons (abbr. $h-h$),
this talk presents the multi-particle correlation between
charge trigger hadron ($3 |
Saturday, October 13, 2007 3:24PM - 3:36PM |
JB.00006: Multi-hadron triggered azimuthal correlations in Au+Au Collisions at $\sqrt(s_{NN})$ = 200 GeV from STAR Brooke Haag Di-hadron correlation measurements have been used to probe di-jet production in heavy ion collisions at RHIC. A strong suppression of the away-side yield in these measurements is direct evidence that high-pt partons lose energy as they traverse the strongly interacting medium that is formed in ultra-relativistic heavy ion collisions. However, recent studies have shown that the momentum of the trigger particle is not a good measure of the jet energy. As a result, azimuthal di-hadron correlations have limited sensitivity to the shape of the fragmentation function itself. As an attempt at better constraining the initial parton energy we employ a multi-hadron triggered azimuthal correlation analysis. We present first results of multi-hadron triggered correlated yields in Au+Au collisions at $\sqrt(s_{NN})$ = 200 GeV from STAR. The results are compared to d+Au collisions and we discuss the implications for jet quenching. [Preview Abstract] |
Saturday, October 13, 2007 3:36PM - 3:48PM |
JB.00007: 3-D Source Functions at RHIC from the AMPT Model Zi-Wei Lin We present results from the AMPT model on pion source functions in Au+Au collisions at RHIC, including source functions along the out, side and long directions. Effects of kinematical cuts on both source functions and correlation functions will be studied. Previously the AMPT model has roughly reproduced the pion correlation functions at 130AGeV in Au+Au collisions (Phys. Rev. Lett. 89, 152301, 2002) as well as the fitted radius parameters (Phys. Rev. C 72, 064901, 2005). Here we compare with available data on both source functions and correlation functions at RHIC, and investigate possible reasons in case of inconsistencies. [Preview Abstract] |
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