Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1851287 | Physics Letters B | 2008 | 8 Pages |
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
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Authors
Ivan Vitev, Ben-Wei Zhang,