PHENIX Direct Photons in 200 GeV p+p and Au+Au Collisions

Details PHENIX Direct Photons in 200 GeV p+p and Au+Au Collisions PHENIX Direct Photons in 200 GeV p+p and Au+Au Collisions

2004-04-03

arxiv.org/abs/nucl-ex/0404006v1

J.Phys. G30 (2004) S1003-S1006

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 5 figures, contribution to the proceedings of the 17th International Conference on Ultra-Relativistic Nucleus-Nucleus

Scientific paper

10.1088/0954-3899/30/8/047

We present the first positive direct photon results in Au+Au at sqrt{s_NN} = 200 GeV along with initial p+p results at the same energy. The p+p result is found to be consistent with NLO perturbative QCD predictions within its large uncertainties. In central Au+Au collisions, an excess over expected background as large as 200-300% is observed from p_T = 4-12 GeV/c. This large signal is shown to be consistent with the scaled pQCD photon prediction, together with suppression of meson background sources.

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