Damping rates of hard momentum particles in a cold ultrarelativistic plasma

Details Damping rates of hard momentum particles in a cold ultrarelativistic plasma Damping rates of hard momentum particles in a cold ultrarelativistic plasma

1996-11-25

arxiv.org/abs/hep-ph/9611415v2

Phys.Rev. D56 (1997) 5108-5122

Physics

High Energy Physics

High Energy Physics - Phenomenology

40 pages, Revtex, 17 Postscript figures (included). Revised version

Scientific paper

10.1103/PhysRevD.56.5108

We compute the damping rates of one-particle excitations in a cold ultrarelativistic plasma to leading order in the coupling constant e for three types of interaction: Yukawa coupling to a massless scalar boson, QED and QCD. Damping rates of charged particles in QED and QCD are of order e^3 mu, while damping rates of other particles are of order e^4 mu or e^4 mu log(1/e). We find that the damping rate of an electron or of a quark is constant far from the Fermi surface, and decreases linearly with the excitation energy close to the Fermi surface. This unusual behavior is attributed to the long-range magnetic interactions.

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