Stanislaw Mrowczynski
(National Centre for Nuclear Research, Warsaw, Poland)
We discuss the transverse momentum broadening of hard probes traversing an evolving glasma, which is the earliest phase of the matter produced in relativistic heavy-ion collisions. The coefficient is calculated using the Fokker-Planck equation, and an expansion in the proper time which is applied to describe the temporal evolution of the glasma. The correlators of the chromodynamic fields that determine the Fokker-Planck collision terms, which in turn provide , are computed to fifth order in . The momentum broadening is shown to rapidly grow in time and reach a magnitude of several . We show that the transient pre-equilibrium phase provides a contribution to the energy loss of hard probes which is comparable to that of the long lasting, hydrodynamically evolving, equilibrium phase.
