Abstract
The gauge-dependence problem of the damping rate of a fermionic mode in hot gauge theories is carefully examined to the effective one-loop order using recently proposed resummation methods in terms of “hard thermal loops”. We study the case of a heavy fermion ( M ⪢ T), which enables us to investigate the essential point of controversy in great detail. Explicit calculation in general covariant gauges shows which calculation procedure should be employed to get a gauge-parameter independent result.
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