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.

13 pages 19 figures

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Cited by in corpus (5)

• Measurement of Direct Photons in pp and Pb-Pb Collisions with ALICE
• Measurement of Direct-Photon Elliptic Flow in Pb-Pb Collisions at sqrt(NN) = 2.76 TeV
• Photons from the Early Stages of Relativistic Heavy Ion Collisions
• Thermal photons in QGP and non-ideal effects
• Hybrid model calculations of direct photons in high-energy nuclear collisions