B. Kampfer et al., DILEPTON PRODUCTION IN A CHEMICALLY EQUILIBRATING, EXPANDING, AND HADRONIZING QUARK-GLUON PLASMA, Physical review. C. Nuclear physics, 52(5), 1995, pp. 2704-2713
Dilepton production is considered within a complete dynamical framewor
k for thermalized matter assumed to be formed in ultrarelativistic hea
vy-ion collisions. Our model includes (i) chemical equilibration proce
sses in the initially gluon enriched plasma, (ii) longitudinal as well
as transverse expansion, and (iii) the hadronization through a mixed
phase. Besides the basic electromagnetic quark-antiquark annihilation
process we also take into account the QCD Compton-like and annihilatio
n processes for calculating the dilepton rate in the deconfined phase,
while in the hadronic stage we employ a parametrization of the effect
ive form factor which is based on the complete set of meson decays and
reactions. We find that, due to the transverse expansion of the matte
r, the dilepton yield from the hadron gas is strongly reduced and, the
refore, the deconfined matter gives the dominant contribution in case
of initial conditions which are expected to be achieved at RHIC. This
provides the basis for the M(perpendicular to), scaling restoration of
the dilepton spectra from thermalized matter.