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Dynamical screening in hot systems away from (chemical) equilibrium

R. Baier, M. Dirks, K. Redlich

hep-pharXiv:hep-ph/9910353

Abstract

Within the Closed Time Path Formalism of Thermal Field Theory we calculate the hard photon emission rate as well as the collisional energy-loss rate for a quark-gluon plasma away from chemical equilibrium. Mass singularities are shown to be dynamically screened within HTL-resummed perturbation theory also away from equilibrium. Additional (pinch) singularities are absent and well defined results are obtained.

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