The quasiparticle structure of hot gauge theories

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dc.creatorIancu, Edmond
dc.creatorTheorique, Service de Physique
dc.creatorSaclay
dc.creatorFrance
dc.date1996-09-02
dc.date.accessioned2026-07-07T03:59:55Z
dc.date.available2026-07-07T03:59:55Z
dc.descriptionThe study of the ultrarelativistic plasmas in perturbation theory is plagued with infrared divergences which are not eliminated by the screening corrections. They affect, in particular, the computation of the lifetime of the elementary excitations, thus casting doubt on the validity of the quasiparticle picture. We show that, for Abelian plasmas at least, the infrared problem of the damping rate can be solved by a non-perturbative treatment based on the Bloch-Nordsieck approximation. The resulting expression of the fermion propagator is free of divergences, and exhibits a {\it non-exponential} damping at large times: $S_R(t)\sim \exp\{-αT t \lnω_pt\}$, where $ω_p=gT/3$ is the plasma frequency and $α=g^2/4π$.
dc.description7 pages, LaTeX, Invited talk at the Workshop on Quantum Chromodynamics, 3-8 June, 1996, American University of Paris, France
dc.identifierhttps://arxiv.org/abs/hep-ph/9609225
dc.identifierhttp://arxiv.org/abs/hep-ph/9609225
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/46424
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe quasiparticle structure of hot gauge theories
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