Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-04-23
Phys.Lett.B669:337-344,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Final version published in PLB. Added comments, 2 references and discussion in relation to SDIS observables
Scientific paper
10.1016/j.physletb.2008.10.019
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. We present 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 of 62.4 GeV and 200 GeV. We find that the contribution of the final-state photon production at pT < 5 GeV is limited to 35%, and at high transverse momenta, the modification of the direct photon cross section is dominated by initial-state cold nuclear matter effects.
Vitev Ivan
Zhang Ben-Wei
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