Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-09-08
Eur.Phys.J.C61:597-601,2009
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 4 figures, 3rd International Conference on Hard and Electro- Magnetic Probes of High-Energy Nuclear Collisions
Scientific paper
10.1140/epjc/s10052-009-0960-z
The presented results are the first measurements at RHIC for direct $\gamma$-charged hadron azimuthal correlations in heavy ion collisions. We use these correlations to study the color charge density of the medium through the medium-induced modification of high-p$_T$ parton fragmentation. Azimuthal correlations of direct photons at high transverse energy (8 $<$ p$_T$ $<$ 16 GeV) with away-side charged hadrons of transverse momentum (3 $<$ p$_T$ $<$ 6 GeV/c) have been measured over a broad range of centrality for $Au+Au$ collisions and $p+p$ collisions at $\sqrt{s_{NN}}$ = 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 p$_T$ $\pi^{0}$. The per-trigger away-side yield of direct $\gamma$ is smaller than from $\pi^{0}$ trigger at the same centrality class. Within the current uncertainty the I$_{CP}$ of direct $\gamma$ and $\pi^{0}$ are similar.
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