Infrared Sensitivity in Damping Rate for Very Soft Moving Fermions in Finite Temperature QED
A. Abada, K. Bouakaz
Abstract
We calculate the fermion damping rate to second order in powers of the external momentum p in the context of QED at finite temperature using the hard-thermal-loop (HTL) summation scheme. We find that the coefficient of order p2 is divergent in the infrared whereas the two others are finite. This result suggests that the htl-based pertubation is infrared sensitive at next-to-leading order.
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