Direct photons measured by the PHENIX experiment at RHIC

Details Direct photons measured by the PHENIX experiment at RHIC Direct photons measured by the PHENIX experiment at RHIC

2006-09-19

arxiv.org/abs/nucl-ex/0609030v1

Eur.Phys.J.C49:225-229,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 5 figures, Proceedings of the Hot Quarks 2006 Workshop for young scientists on the physics of ultra-relativistic nucl

Scientific paper

10.1140/epjc/s10052-006-0084-7

Results from the PHENIX experiment at RHIC on direct photon production in p+p, d+Au, and Au+Au collisions at sqrt(s_NN) = 200 GeV are presented. In p+p collisions, direct photon production at high p_T behaves as expected from perturbative QCD calculations. The p+p measurement serves as a baseline for direct photon production in Au+Au collisions. In d+Au collisions, no effects of cold nuclear matter are found within the large uncertainty of the measurement. In Au+Au collisions, the production of high p_T direct photons scales as expected for particle production in hard scatterings. This supports jet quenching models, which attribute the suppression of high p_T hadrons to the energy loss of fast partons in the medium produced in the collision. Low p_T direct photons, measured via e+e- pairs with small invariant mass, are possibly related to the production of thermal direct photons.

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