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

摘要: 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 Compton scattering (qg→γq) lead to logarithmically divergent thermal production rates massless quarks. By applying recently developed resummation methods finite temperature perturbation theory we show that effects due Landau damping on exchanged quark provide rates. Comparisons with previous estimates phenomenological implications are discussed.