Damping rate of a moving fermion

Journal Article · Fri Jan 15 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.703· OSTI ID:6832497

Altherr, T; Petitgirard, E; del Rio Gaztelurrutia, T ^[1]

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1. Laboratoire de Physique Theorique, ENSLAPP, Boite Postale 110, F-74941 Annecy-le-Vieux CEDEX (France)

We perform a detailed analysis of the damping rate of a moving fermion in hot QED. Using bare propagators and taking a slightly off-shell fermion, we prove the cancellation of both magnetic and electric infrared singularities at two-loop order. Although infrared finite, the perturbation series is very badly behaved when the fermion is taken on shell. This problem is overcome by resumming both the hard loops in the photon propagator and the damping rate in the fermion propagator. The damping rate can only be calculated through a Schwinger-Dyson equation. We also study the gauge independence of our result.

• OSTI ID: 6832497
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:2; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662220* -- Quantum Electrodynamics-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COUPLING CONSTANTS
DAMPING
DYSON REPRESENTATION
ELECTRODYNAMICS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
GREEN FUNCTION
INFRARED DIVERGENCES
LIGHT CONE
MASSLESS PARTICLES
PERTURBATION THEORY
PHOTONS
PROPAGATOR
QUANTUM ELECTRODYNAMICS
QUANTUM FIELD THEORY
RENORMALIZATION
SINGULARITY
SPACE-TIME
TEMPERATURE DEPENDENCE
WAVE FUNCTIONS