Gluon plasmon frequency near the light-cone

Abstract

Thermal perturbation theory based on the resummation scheme by Braaten and Pisarski suffers from unscreened collinear singularities whenever outer momenta become light-like. A recently proposed improvement of the hard thermal loops by an additional resummation of an asymptotic mass promises to solve this problem. Here we present a detailed investigation of the next-to-leading order plasmon self-energy. It demonstrates the applicability and consistency of the improved scheme.

Comments: 9 pages, REVTEX twocolumn, two postscript figures. Talk given at the 5th International Workshop on Thermal Field Theories and Their Applications, Regensburg, August 1998. (Now REVTEX, minor typos corrected)