2008/10/22 by A. Hamed, A. M. Hamed, Hamed, A. M.
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.48550/arxiv.0810.3951
5 pages, 7 figures, Hot Quarks 2008
arxiv created 2008/10/22 · openalex publication_date 2008/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The recent results at RHIC for direct γ-charged hadron azimuthal correlations in heavy-ion collisions are presented. We use these correlations to study the color charge density of the medium through the medium-induced modification of high-pT parton fragmentation. Azimuthal correlations of direct photons at high transverse energy (8 < ET < 16 GeV) with away-side charged hadrons of transverse momentum (3 < pT < 6 GeV/c) have been measured over a broad range of centrality for Au+Au collisions and p+p collisions at √sNN = 200 GeV in the STAR experiment. A transverse shower shape analysis in the STAR Barrel Electromagnetic Calorimeter Shower Maximum Detector is used to discriminate between the direct photons and photons from the decays of high-pT π0. The per-trigger away-side yield of direct γ is smaller than from π0 triggers in the same centrality class. Within the current uncertainty the recoil suppression in central Au+Au collisions ICP of direct γ and π0 are similar.