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Production rate of hard thermal photons and screening of quark mass singularity

Authors:	R Baier H Nakkagawa A Niégawa K Redlich

Institution:	1. Fakult?t für Physik, Universit?t Bielefeld, W-4800, Bielefeld 1, Federal Republic of Germany 2. Institute for Natural Science, Nara University, 631, Nara, Japan 3. Department of Physics, Osaka City University, 558, Osaka, Japan 4. Department of Theoretical Physics, University of Wroclaw, PL-50200, Wroclaw, Poland

Abstract:	The emission of hard real photons from a quark-gluon plasma at high temperatures is studied. At lowest order the QCD processes for quark-antiquark annihilation $(q\bar q \to \gamma g)$ and for Compton scattering (qgq) lead to logarithmically divergent thermal production rates for massless quarks. By applying recently developed resummation methods of finite temperature perturbation theory we show that effects due to Landau damping on the exchanged quark provide finite rates. Comparisons with previous estimates and phenomenological implications are discussed.Supported in part by the Minister for Research and Technology (BMFT) of the Federal Republic of Germany under contract 06-BI-701

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