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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Thoma, M.H. Damping of a Yukawa fermion at finite temperature. Z. Phys. C - Particles and Fields 66, 491–494 (1995). https://doi.org/10.1007/BF01556376
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DOI: https://doi.org/10.1007/BF01556376