Abstract
The damping of a massless fermion coupled to a massless scalar particle at finite temperature is considered using the Braaten-Pisarski resummation technique. First the hard thermal loop diagrams of this theory are extracted and effective Green's functions are constructed. Using these effective Green's functions the damping rate of a soft Yukawa fermion is calculated. This rate provides the simplest example for the damping of a soft particle. To leading order it is proportional tog 2 T, whereas the one of a hard fermion is of higher order.
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