The relativistic Fokker Planck equation has been used to study the evolution
of the quark distribution in the quark gluon phase expected to be formed in
ultra-relativistic heavy ion collisions. The effect of thermal masses for
quarks and gluons is incorporated to take account of the in-medium properties.
We find that the kinetic equilibrium is achieved before the system reaches the
critical temperature of quark hadron phase transition. We find that chemical
equilibrium is not achieved during this time. We have evaluated the
electromagnetic probes of quark gluon plasma from the non-equilibrated quark
gluon phase and compared them with those in completely equilibrated scenario.
The hard QCD production rates for the electromagnetic ejectiles as well as the
heavy quark production rates are also calculated.Comment: Submitted to Nucl. Phys.
