Quasiparticle lifetimes and infrared physics in QED and QCD plasmas
Conference
·
OSTI ID:605665
- CEA-Saclay, Gif-sur-Yvette (France)
The perturbative calculation of the lifetime of fermion excitations in a QED plasma at high temperature is plagued with infrared divergences which are not eliminated by the screening corrections. The physical processes responsible for these divergences are the collisions involving the exchange of longwavelength, quasistatic, magnetic photons, which are not screened by plasma effects. The leading divergences can be resummed in a non-perturbative treatment based on a generalization of the Bloch-Nordsieck model at finite temperature. The resulting expression of the fermion propagator is free of infrared problems, and exhibits a non-exponential damping at large times: S{sub R}(t) {approx} exp(-{alpha}T t ln{omega}{sub p}t), where {omega}{sub p} = eT/3 is the plasma frequency and {alpha} = e{sup 2}/4{pi}.
- Research Organization:
- Associated Universities, Inc., Upton, NY (United States)
- OSTI ID:
- 605665
- Report Number(s):
- BNL--64912-Vol.4; CONF-9709192--Vol.4; ON: DE98001892
- Country of Publication:
- United States
- Language:
- English
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