A systematic study of direct photon production in heavy ion collisions

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