High-energy photons from quark-gluon plasma versus hot hadronic gas

Joseph I Kapusta, Peter Lichard, David Seibert

Research output: Contribution to journalArticlepeer-review

492 Scopus citations


Photons in the energy range of about one-half to several GeV have been proposed as a signal of the formation of a quark-gluon plasma in high-energy collisions. To lowest order the thermal emission rate is infrared divergent for massless quarks, but we regulate this divergence using the resummation technique of Braaten and Pisarski. Photons can also be produced in the hadron phase. We find that the dominant contribution comes from the reactions and the decays and are also significant. Comparing the thermal emission rates at a temperature T=200 MeV we conclude that the hadron gas shines just as brightly as the quark-gluon plasma.

Original languageEnglish (US)
Pages (from-to)2774-2788
Number of pages15
JournalPhysical Review D
Issue number9
StatePublished - 1991


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