B. Kampfer et Op. Pavlenko, PHOTON PRODUCTION IN AN EXPANDING AND CHEMICALLY EQUILIBRATING GLUON-ENRICHED PLASMA, Zeitschrift fur Physik. C, Particles and fields, 62(3), 1994, pp. 491-497
Photon production in a longitudinally and transversely expanding gluon
plasma with initially little quark admixture is considered. Chemical
equilibration of quarks and gluons is followed by rate equations. The
yields of hard photons with E greater-than-or-equal-to 2 GeV are insen
sitive to chemical equilibration and depend mainly on the initial ther
malized state. Medium-energy photons with E approximately 1 GeV are mo
re frequently produced in case of faster equilibration, despite of fas
ter cooling. For an assumed' fast equilibration we follow the evolutio
n of matter through mixed and hadron phases. The transverse momentum k
ick, due to transverse expansion, of photons from hadron matter is sho
wn to be reduced for an equation of state with reduced latent heat. Th
e photon yield in the region E > 1 GeV from deconfined matter dominate
s for conditions, estimated to be achieved at RHIC, in case of a weakl
y first-order confinement transition.