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A systematic study of direct photon production in heavy ion collisions

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
669
Issue
5
Identifiers
DOI: 10.1016/j.physletb.2008.10.019
Keywords
  • Phenomenology
Disciplines
  • Physics

Abstract

Abstract A theoretical derivation of photon bremsstrahlung, induced by the interactions of an energetic quark in a hot and dense quark–gluon plasma, is given in the framework of the reaction operator approach. For the physically relevant case of hard jet production, followed by few in-medium interactions, we find that the Landau–Pomeranchuk–Migdal suppression of the bremsstrahlung photon intensity is much stronger than in the previously discussed limit of on-shell quarks and a large number of soft scatterings. This result is incorporated in the first systematic study of direct photon production in minimum bias d + Cu and d + Au and central Cu + Cu and Au + Au heavy ion collisions at the Relativistic Heavy Ion Collider at center of mass energies s = 62.4 GeV and 200 GeV. We find that the contribution of the photons created via final-state interactions is limited to 35% for 2 GeV < p T < 5 GeV and at high transverse momenta the modification of the direct photon cross section is dominated by initial-state cold nuclear matter effects.

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