Quark Matter 2005 Conference   Quark Matter 2005 Conference


Azimuthal correlations of high-pTphotons and hadrons in Au+Au collisions at RHIC

Thomas Dietel

Collaboration: STAR

Abstract:

The measurement of $\gamma$+jet events can provide unique insights into the propagation and fragmentation of hard partons in the presence of the hot medium created in heavy-ion collisions. While the photon generally escapes unmodified from the interaction region, the parton will be subject to energy loss in the medium and the modification of fragmentation functions. We present azimuthal correlations between photons and charged hadrons in Au+Au collisisons at $\sqrt{s_{NN}} = 200 GeV$ measured by STAR. The data sample taken during the 2004 RHIC run corresponds to 350 million minimum bias events or 50 $\mu{}b^{-1}$ and allows the analysis of correlations with a tranverse momentum range that will extend to more than 10 GeV for the trigger particle and more than 4 GeV for the associated particles for multiple centrality bins. The discrimination of direct photons and photons from hadronic decays, especially neutral pion decays, will be discussed.


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