Photon Damping in One-Loop HTL Perturbation Theory
  We determine the damping rates of slow-moving photons in next-to-leading order hard-thermal-loop perturbation of massless QED. We find both longitudinal and transverse rates finite, positive, and equal at zero momentum. Various divergences, light-cone and at specific momenta, but not infrared, appear and cancel systematically. 
Abdessamad Abada and Nacera Daira-Aifa
hep-ph