Hadronic Production of Thermal Photons

Details Hadronic Production of Thermal Photons Hadronic Production of Thermal Photons

2003-08-07

arxiv.org/abs/hep-ph/0308085v3

Phys.Rev. C69 (2004) 014903

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 13 figures, 1 appendix. Discussion added, improved parameterisations

Scientific paper

10.1103/PhysRevC.69.014903

We study the thermal emission of photons from hot and dense strongly interacting hadronic matter at temperatures close to the expected phase transition to the Quark-Gluon Plasma (QGP). Earlier calculations of photon radiation from ensembles of interacting mesons are re-examined with additional constraints, including new production channels as well as an assessment of hadronic form factor effects. Whereas strangeness-induced photon yields turn out to be moderate, the hitherto not considered t-channel exchange of omega mesons is found to contribute appreciably for photon energies above ~1.5 GeV. The role of baryonic effects is assessed using existing many-body calculations of lepton pair production. We argue that our combined results constitute a rather realistic emission rate, appropriate for applications in relativistic heavy-ion collisions. Supplemented with recent evaluations of QGP emission, and an estimate for primordial (hard) production, we compute photon spectra at SPS, RHIC and LHC energies.

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