A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions

Abstract : We investigate the production of direct photons in central Au-Au collisions at the relativistic Heavy-Ion Collider (RHIC) at 200 GeV per nucleon, considering all possible sources. We treat thermal photons emitted from a quark-gluon plasma and from a hadron gas, based on a realistic thermodynamic expansion. Hard photons from elementary nucleon-nucleon scatterings are included: primordial elementary scatterings are certainly dominant at large transverse momenta, but also secondary photons from jet fragmentation and jet-photon conversion cannot be ignored. In both cases we study the effect of energy loss, and we also consider photons emitted from bremsstrahlung gluons via fragmentation.
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Submitted on : Thursday, January 24, 2008 - 1:00:59 PM
Last modification on : Thursday, January 24, 2008 - 1:00:59 PM

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Fu-Ming Liu, Klaus Werner. A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions. Journal of Physics G: Nuclear and Particle Physics, Institute of Physics: Hybrid Open Access, 2009, 36, pp.035101. <10.1088/0954-3899/36/3/035101>. <in2p3-00216073>

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