Screening of mass singularities and finite soft-photon production rate in hot QCD
- Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558 (Japan)
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 a 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 the 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{endash} (hard-)quark vertex corrections also yield the leading contribution to the production rate. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 527086
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 2 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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