Direct Photons in Heavy-Ion Collisions

Details Direct Photons in Heavy-Ion Collisions Direct Photons in Heavy-Ion Collisions

2006-11-06

arxiv.org/abs/nucl-ex/0611004v1

AIPConf.Proc.892:413-416,2007

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, to appear in the proceedings of the conference "Quark Confinement and the Hadron Spectrum VII" (QCHS7), Po

Scientific paper

10.1063/1.2714431

A brief overview of direct-photon measurements in ultra-relativistic nucleus-nucleus collisions is given. The results for Pb+Pb collisions at sqrt{s_NN} = 17.3 GeV and for Au+Au collisions at sqrt{s_NN} = 200 GeV are compared to estimates of the direct-photon yield from hard scattering. Both results leave room for a significant thermal photon component. A description purely based on hard scattering processes, however, is not ruled out so far.

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