Comment on High-temperature fermion propagator: Resummation and gauge dependence of the damping rate''

Journal Article · Sat Nov 14 23:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.4779· OSTI ID:7200214

Rebhan, A ^[1]

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1. Laboratoire de Physique Theorique, ENSLAFF, BP 110, F-74941 Annecy-le-Vieux CEDEX (France) Theory Division, CERN, CH-1211 Geneva 23 (Switzerland)

Baier, Kunstatter, and Schiff 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 infrared. After regularization of this expansion, the observed gauge dependence is found to pertain 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.

• OSTI ID: 7200214
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:10; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662220* -- Quantum Electrodynamics-- (1992-)
662230 -- Quantum Chromodynamics-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
DAMPING
DISPERSION RELATIONS
ELECTRODYNAMICS
ENERGY
FERMIONS
FIELD THEORIES
GAUGE INVARIANCE
INVARIANCE PRINCIPLES
LAGRANGIAN FIELD THEORY
METRICS
PROPAGATOR
QUANTUM CHROMODYNAMICS
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
SELF-ENERGY
TEMPERATURE DEPENDENCE