R. Baier et al., GAUGE-FIXING DEPENDENCE OF GLUON AND QUARK-DAMPING RATES IN HOT QUANTUM CHROMODYNAMICS, Canadian journal of physics, 71(5-6), 1993, pp. 208-214
The recently observed gauge-fixing dependence in covariant gauges of t
he damping rates of the quantum chromodynamics (QCD) gluonic and fermi
onic excitations at high temperatures and long wavelengths is reviewed
. The analysis is based on the method by Braaten and Pisarski for resu
mming hard thermal loops using the Ward identities satisfied by the ef
fective propagators and vertex functions. A proposed resolution of the
gauge problem by regularizing the mass singularities is also discusse
d.