Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-01-23
J.Phys.G34:S1015-1018,2007
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 4 figures. Invited parallel talk at The 19th International Conference On Ultra relativistic Nucleus-Nucleus Collision
Scientific paper
10.1088/0954-3899/34/8/S146
When studying the initial state and evolution of the matter created in relativistic heavy ion collisions, high-pT direct photons are a powerful probe. They are created in initial hard processes and in parton fragmentation, and possibly in interactions of partons with the hot and dense medium. We present systematic measurements of high-pT direct photon production in \sqrt{s_{NN}} = 200 GeV p+p and Au+Au collisions. The nuclear modification factor of direct photons is shown for 5 < pT < 18 GeV/c, and at very high transverse momenta it seems to be below unity in the most central Au+Au collisions.
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