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Journal of Physics G: Nuclear and Particle Physics 36 (2009) 035101
A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions
Fu-Ming Liu, Klaus Werner1

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.
1 :  SUBATECH - Laboratoire SUBATECH Nantes
Physique/Physique des Hautes Energies - Phénoménologie
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