Damping Rate of a Fermion in a Medium

Details Damping Rate of a Fermion in a Medium Damping Rate of a Fermion in a Medium

1993-09-03

arxiv.org/abs/hep-ph/9309225v2

Phys.Rev.D52:2987-2993,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.52.2987

We examine the relation between the damping rate of a massless, chiral fermion that propagates in a medium, and the rate $\Gamma$ of approach to equilibrium. It is proven that these quantities are equal, by showing that they are given by the same formula in terms of the imaginary part of the self-energy evaluated at the energy of the propagating fermion mode. This result is valid provided $\Gamma$ is defined by using the appropriate wave functions of the mode.

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