2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41847We 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 $p^{2}$ 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.4 pages, contribution to QM2002, 18-24 july 2002, Nantes, FranceHigh Energy Physics - Phenomenologytext