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

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

2007-12-21

arxiv.org/abs/0712.3619v2

J.Phys.G36:035101,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages 19 figures

Scientific paper

10.1088/0954-3899/36/3/035101

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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