Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session W8: Minisymposium: Heavy Quark Energy Loss & Flow |
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Sponsoring Units: DNP Chair: Peter Jacobs, Lawrence Berkeley National Laboratory Room: Hyatt Regency Dallas Cumberland A |
Tuesday, April 25, 2006 10:45AM - 11:21AM |
W8.00001: Identified particle transverse momentum distributions upto 12 GeV/c from Au+Au collisions at $\sqrt{s_{_{NN}}} = 200$ GeV Invited Speaker: Ultra-relativistic Au+Au collisions at $\sqrt{s_{_{NN}}} = 200$ GeV at RHIC create a hot and dense medium that exhibits novel properties. Study of these properties and hadronization mechanisms of the medium requires identified particle results over wide transverse momentum ($p_T$) range since different mechanisms govern hadron production in different kinematic regions. Particle identification at low, intermediate and high $p_{T}$ is achieved from Time Projection Chamber and Time-of-Flight system at STAR. In this talk, we present the $p_T$ distributions of $\pi^{\pm}$, $p$ and $\bar{p}$, their nuclear modification factors and particle ratios from 200 GeV Au+Au collisions up to 12 GeV/$c$ at mid-rapidity. We discuss the relative baryon enhancement at intermediate $p_{T}$ and the flavor dependence of the energy loss. We also discuss the possible transition between jet dominant fragmentation and quark coalescence at hadronization. [Preview Abstract] |
Tuesday, April 25, 2006 11:21AM - 11:33AM |
W8.00002: Heavy-quark observables at RHIC from parton transport theory Denes Molnar There are several indications that an opaque partonic medium is created in energetic Au+Au collisions ($\sqrt{s} \sim 100$ GeV/nucleon) at the Relativistic Heavy Ion Collider (RHIC). At the extreme densities of $\sim$ 10-100 times normal nuclear density reached even heavy-flavor hadrons are affected significantly. Results on heavy-quark observables will be presented based on the parton transport model MPC, focusing on the nuclear suppression pattern and the azimuthal anisotropy (``elliptic flow''). I will contrast the opacities extracted from light and heavy-flavor observables and will test whether both open and hidden heavy-flavor observables can be explained in the parton transport framework. [Preview Abstract] |
Tuesday, April 25, 2006 11:33AM - 11:45AM |
W8.00003: Hadron-Hadron Angular Correlations in $\sqrt{s_{NN}}$ = 62.4 GeV Au+Au Collisions at RHIC-PHENIX Michael McCumber The study of medium effects in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions at RHIC via jet properties extracted from di-hadron opening angle correlations has yielded the observation of significant modification of the away-side jet. We analyze $\sqrt{s_{NN}}$ = 62.4 GeV Au+Au collisions and find that the away-side jet modification persists at this lower energy. We present the results of corrected angular correlation measurements and also a novel technique for model-independent quantification of the away-side jet shape. We compare our results to measurements made in other colliding systems and in other energies. [Preview Abstract] |
Tuesday, April 25, 2006 11:45AM - 11:57AM |
W8.00004: Photon-hadron and $\pi^0$-hadron azimuthal jet correlations in $\sqrt{s_{NN}}=200$ GeV Cu-Cu collisions at RHIC Andrew Adare Angular correlation of final-state particles provides an informative probe of the dense, hot matter produced in high-energy nuclear collisions. A brief description of the technique of angular pair correlations and their application to QCD jet analysis in heavy-ion collisions is presented in addition to preliminary results from $\gamma-h$ and $\pi^0-h$ azimuthal pair correlations from the PHENIX experiment at RHIC. [Preview Abstract] |
Tuesday, April 25, 2006 11:57AM - 12:09PM |
W8.00005: Jet Trigger Analysis for the ALICE Electromagnetic Calorimeter Christopher Anson The analysis of jets in ultra-relativistic heavy ion collisions with the ALICE experiment at the LHC requires a sophisticated trigger scheme to acquire a high statistics sample of high p$_{t}$ jets. This can be implemented using the large area electromagnetic calorimeter (EMCal)~proposed by the ALICE-USA Collaboration. A Level 1 EMCal jet trigger will be discussed and compared to an idealized leading pi0 trigger in order to elucidate the underlying trigger behavior. The effect of fluctuations in the rather large background will be explored. It will be shown that a Level 1 trigger can select appropriate jet events efficiently while reducing the data rate to the required level. The necessity of a further reduction of the data rate requires the use of an efficient higher level multiplicity dependent jet trigger which will be discussed. [Preview Abstract] |
Tuesday, April 25, 2006 12:09PM - 12:21PM |
W8.00006: Jet studies in preparation for ATLAS: from pp to heavy ion collisions Arthur Moraes The Large Hadron Collider (LHC) will collide protons at centre-of-mass energies many times greater than any sub-atomic particle collision ever performed in laboratory and will also run a variety of ion beams, thus providing proton-ion and ion-ion collisions. Designed to perform very precise measurements at the LHC, the ATLAS detector will play a key role in revealing the most interesting and complicated features of proton-proton, proton-nucleus and nucleus-nucleus collisions at the LHC. Understanding the structure of jets will be of fundamental importance in the identification of the Higgs and Supersymmetry in proton collisions, as well as a variety of other new physics phenomena in heavy ion collisions such as jet quenching. The ATLAS calorimeter is particularly well designed and should allow excellent jet energy and profile measurements. This talk focuses on jet studies in preparation for heavy ion collisions at ATLAS. Predictions for jet distributions in proton-proton collisions will also be shown and used to provide insights into the measurement of new physics signatures in heavy ion collisions. [Preview Abstract] |
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