Screening of mass singularities and finite soft-photon production rate in hot QCD

Details Screening of mass singularities and finite soft-photon production rate in hot QCD Screening of mass singularities and finite soft-photon production rate in hot QCD

1996-07-18

arxiv.org/abs/hep-th/9607150v2

Phys.Rev. D56 (1997) 1073-1090

Physics

High Energy Physics

High Energy Physics - Theory

41pages, Figures are not included

Scientific paper

10.1103/PhysRevD.56.1073

The production rate of a soft photon from a hot quark-gluon plasma is computed to leading order at logarithmic accuracy. The canonical hard-thermal-loop resummation scheme leads to logarithmically divergent production rate due to mass singularities. We show that these mass singularities are screened by employing the effective hard-quark propagator, which is obtained through resummation of one-loop self-energy part in a self-consistent manner. The damping-rate part of the effective hard-quark propagator, rather than the thermal-mass part, plays the dominant role of screening mass singularities. Diagrams including photon--(hard-)quark vertex corrections also yield leading contribution to the production rate.

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