Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"

Baier et al. have reported the damping rate of long-wavelength fermionic excitations in high-temperature QED and QCD to be gauge-fixing-dependent even within the resummation scheme due to Braaten and Pisarski. It is shown that this problem is caused by the singular nature of the on-shell expansion o...

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Autor principal: Rebhan, Anton
Lenguaje:eng
Publicado: 1992
Materias:
Particle Physics - Theory
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.46.4779
http://cds.cern.ch/record/235428
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author Rebhan, Anton
author_facet Rebhan, Anton
author_sort Rebhan, Anton
collection CERN
description Baier et al. have reported the damping rate of long-wavelength fermionic excitations in high-temperature QED and QCD to be gauge-fixing-dependent even within the resummation scheme due to Braaten and Pisarski. It is shown that this problem is caused by the singular nature of the on-shell expansion of the fermion self-energy in the infra-red. Its regularization reveals that the alleged gauge dependence pertains to the residue rather than the pole of the fermion propagator, so that in particular the damping constant comes out gauge-independent, as it should.
id cern-235428
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1992
record_format invenio
spelling cern-2354282023-03-14T20:16:41Zdoi:10.1103/PhysRevD.46.4779http://cds.cern.ch/record/235428engRebhan, AntonComment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"Particle Physics - TheoryBaier et al. have reported the damping rate of long-wavelength fermionic excitations in high-temperature QED and QCD to be gauge-fixing-dependent even within the resummation scheme due to Braaten and Pisarski. It is shown that this problem is caused by the singular nature of the on-shell expansion of the fermion self-energy in the infra-red. Its regularization reveals that the alleged gauge dependence pertains to the residue rather than the pole of the fermion propagator, so that in particular the damping constant comes out gauge-independent, as it should.Baier et al.have reported the damping rate of long-wavelength fermionic excitations in high-temperature QED and QCD to be gauge-fixing-dependent even within the resummation scheme due to Braaten and Pisarski. It is shown that this problem is caused by the singular nature of the on-shell expansion of the fermion self-energy in the infra-red. Its regularization reveals that the alleged gauge dependence pertains to the residue rather than the pole of the fermion propagator, so that in particular the damping constant comes out gauge-independent, as it should.hep-ph/9204210CERN-TH-6434-92ENSLAPP-A-377-92CERN-TH-6434-92ENSLAPP-A-377oai:cds.cern.ch:2354281992
spellingShingle Particle Physics - Theory
Rebhan, Anton
Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title_full Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title_fullStr Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title_full_unstemmed Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title_short Comment on "High temperature fermion propagator - resummation and gauge dependence of the damping rate"
title_sort comment on "high temperature fermion propagator - resummation and gauge dependence of the damping rate"
topic Particle Physics - Theory
url https://dx.doi.org/10.1103/PhysRevD.46.4779
http://cds.cern.ch/record/235428
work_keys_str_mv AT rebhananton commentonhightemperaturefermionpropagatorresummationandgaugedependenceofthedampingrate

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