A systematic study of direct photon production in heavy ion collisions
| dc.creator | Vitev, Ivan | |
| dc.creator | Zhang, Ben-Wei | |
| dc.date | 2008-04-23 | |
| dc.date | 2008-11-10 | |
| dc.date.accessioned | 2026-07-07T11:50:10Z | |
| dc.date.available | 2026-07-07T11:50:10Z | |
| dc.description | 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. | |
| dc.description | Final version published in PLB. Added comments, 2 references and discussion in relation to SDIS observables | |
| dc.identifier | https://arxiv.org/abs/0804.3805 | |
| dc.identifier | http://arxiv.org/abs/0804.3805 | |
| dc.identifier | Phys.Lett.B669:337-344,2008 | |
| dc.identifier | doi:10.1016/j.physletb.2008.10.019 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/203479 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | A systematic study of direct photon production in heavy ion collisions | |
| dc.type | text |