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arXiv · hep-th/9607150

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

A. Niégawa
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Abstract

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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A. Niégawa. 1997-02-24. Screening of mass singularities and finite soft-photon production rate in hot QCD. https://doi.org/10.1103/physrevd.56.1073

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