TY - JOUR
AB - We study the thermal production of large-invariant-mass photon pairs emitted from a quark-gluon plasma at high temperature. To lowest order in perturbation theory the cross section for the annihilation process (qqBAR-->gamma-gamma) is known to lead to logarithmically divergent thermal production rates for massless quarks. We apply recently developed resummation methods of finite-temperature perturbation theory and show how screening effects on quarks in the plasma provide finite thermal rates for gamma-gamma pairs. We compare these results with previous estimates of gamma-gamma production rates. Finally, for the phenomenology of heavy-ion collisions we present the screened gamma-gamma emission spectra by taking into account the space-time history of these collisions.
AU - Baier, Rudolf
AU - Nakkagawa, H.
AU - Niegawa, A.
AU - Redlich, K.
ID - 1780882
IS - 11
JF - Physical review D: Particles, fields, gravitation, and cosmology
SN - 0556-2821
TI - Production of [Gamma]-[Gamma] pairs in a hot quark-gluon plasma and shielding of the quark mass singularity
VL - 45
ER -