Production of gamma gamma pairs in a hot quark gluon plasma and shielding of quark mass singularity

Baier, R.; Nakkagawa, H.; Niegawa, A.; Redlich, K.

doi:10.1103/PhysRevD.45.4323

Production of gamma gamma pairs in a hot quark gluon plasma and shielding of quark mass singularity

R. Baier
(
- Bielefeld U.
)
,
H. Nakkagawa
(
- Bielefeld U. and
- Nara U.
)
,
A. Niegawa
(
- Bielefeld U. and
- Osaka City U.
)
,
K. Redlich
(
- Bielefeld U. and
- Wroclaw U.
)

Nov, 1991

24 pages

Published in:

Phys.Rev.D 45 (1992) 4323-4332

DOI:

10.1103/PhysRevD.45.4323

Report number:

BI-TP-91-17

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Abstract: (APS)

We study the thermal production of large-invariant-mass photon pairs emitted from a quark-gluon plasma at high temperature. To lowest order in perturbation theory the cross section for the annihilation process qq¯→γγ is known to lead to logarithmically divergent thermal production rates for massless quarks. We apply recently developed resummation methods of finite-temperature perturbation theory and show how screening effects on quarks in the plasma provide finite thermal rates for γγ pairs. We compare these results with previous estimates of γγ production rates. Finally, for the phenomenology of heavy-ion collisions we present the screened γγ emission spectra by taking into account the space-time history of these collisions.

nucleus nucleus: nuclear reaction
scattering: heavy ion
heavy ion: scattering
quark gluon: plasma
photon: pair production
pair production: photon
photon: hadroproduction
hadroproduction: photon
mass spectrum: two-photon
two-photon: mass spectrum

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