Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate''

Details Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate'' Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate''

1992-04-06

arxiv.org/abs/hep-ph/9204210v1

Phys.Rev. D46 (1992) 4779-4781

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages

Scientific paper

10.1103/PhysRevD.46.4779

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.

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