Abstract. We extend our recently advanced model on collisional energy loss of heavy quarks in a quark gluon plasma (QGP) by including radiative energy loss. We discuss the approach and present first preliminary results, including a comparison of the role of both types of energy loss for experimental data. We draw the conclusion that the present nuclear modification factor R AA data on non-photonic single electrons does not permit to "select" between this two types of energy-loss mechanisms.

We present a dynamical model of heavy quark evolution in the quarkgluon plasma (QGP) based on the Fokker-Planck equation. We then apply this model to the case of ultra-relativistic nucleus-nucleus collisions performed at RHIC in order to investigate which experimental observables might help to discriminate the fundamental process leading to thermalization.

Abstract. We present a dynamical model of heavy quark evolution in the quarkgluon plasma (QGP) based on the Fokker-Planck equation. We then apply this model to the case of central ultra-relativistic nucleus-nucleus collisions performed at RHIC and estimate the component of J/ψ production (integrated and differential) stemming from c-c pairs that are initially uncorrelated.