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

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.4323· OSTI ID:7106299

Baier, R ^[1]; Nakkagawa, H ^[2]; Niegawa, A ^[3]; Redlich, K ^[4]

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1. Fakultaet fuer Physik, Universitaet Bielefeld, 4800 Bielefeld 1 (Germany)
2. Fakultaet fuer Physik, Universitaet Bielefeld, 4800 Bielefeld 1 (Germany) Institute for Natural Science, Nara University, Nara 631 (Japan)
3. Fakultaet fuer Physik, Universitaet Bielefeld, 4800 Bielefeld 1 (Germany) Department of Physics, Osaka City University, Osaka 558 (Japan)
4. Fakultaet fuer Physik, Universitaet Bielefeld, 4800 Bielefeld 1 (Germany) Department of Theoretical Physics, University of Wroclaw, Wroclaw (Poland)

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 ({ital q{bar q}}{r arrow}{gamma}{gamma}) 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 {gamma}{gamma} pairs. We compare these results with previous estimates of {gamma}{gamma} production rates. Finally, for the phenomenology of heavy-ion collisions we present the screened {gamma}{gamma} emission spectra by taking into account the space-time history of these collisions.

• OSTI ID: 7106299
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
BASIC INTERACTIONS
BORN APPROXIMATION
BOSONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAMPING
DIAGRAMS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EMISSION SPECTRA
ENERGY RANGE
FEYNMAN DIAGRAM
HEAVY ION REACTIONS
INTERACTIONS
LANDAU DAMPING
MASS
MASSLESS PARTICLES
MATHEMATICAL SPACE
MATTER
MOMENTUM TRANSFER
NUCLEAR REACTIONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
PHASE SPACE
PHOTONS
QUARK MATTER
QUARK-ANTIQUARK INTERACTIONS
RELATIVISTIC RANGE
SPACE
SPECTRA
TEMPERATURE EFFECTS