RESUMMED LOOP EXPANSION FOR HIGH-TEMPERATURE QCD

A simple method is proposed to establish on-shell gauge independence in theso far ill-conditioned loop expansion of QCD at high temperature. We perform a partial resummation by choosing an appropriate bare lagrangian with a gauge invariant gluon mass. Taking this mass equal to the plasmon frequency, the plasmon damping constant is explicitly shown to be gauge independent at one loop. The wrong sign of this constant points to the relevance of higher-loop corrections in the remaining redefined perturbation series. © 1990.