Fermion damping rate in a hot medium

Details Fermion damping rate in a hot medium Fermion damping rate in a hot medium

1994-09-12

arxiv.org/abs/hep-ph/9409280v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, revtex, 8 figures; also available at ftp://tpri6c.gsi.de/pub/phenning/h95spec/ or at http://www.gsi.de/~phenning/t

Scientific paper

In principle every excitation acquires a finite lifetime in a hot system. This nonzero spectral width is calculated self-consistently for massive fermions coupled to massless scalar, vector and pseudoscalar bosons. It is shown that the self-consistent summation of the corresponding Fock diagram for fermions eliminates all infrared divergences although the bosons are not screened at all. Our solutions for the fermion damping rate are analytical in the coupling constant, but not analytical in the temperature parameter around T=0.

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