Measurement of direct photons in s(NN)**1/2 = 200 GeV p+p and Au+Au collisions with the PHENIX Experiment at RHIC

Abstract

The measurement of direct photons in s(NN)**1/2 = 200 GeV p+p and Au+Au collisions is presented. The signal is compared to NLO pQCD calculations, which, in case of Au+Au, are scaled with the number of underlying nucleon-nucleon collisions. The agreement of the calculation with the data in both cases confirms the scaling of hard processes with the number of nucleon-nucleon collisions and supports the explanation of the earlier-observed pion suppression as a final-state effect.

4 pages, 3 figures, To appear in the proceedings of the 5th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP), Calcutta, India, February 8 - 12, 2005

References in corpus (6)

• Suppressed pi^0 Production at Large Transverse Momentum in Central Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Mid-Rapidity Neutral Pion Production in Proton-Proto Collisions at sqrt(s_NN) = 200 GeV
• Centrality Dependence of Direct Photon Production in sqrt(s_NN) = 200 GeV Au+Au Collisions
• High energy photons from passage of jets through quark gluon plasma
• Mid-Rapidity Direct-Photon Production in p+p Collisions at sqrt(s) = 200 GeV
• Prompt Photon and Inclusive ${\pi }^0$ Production at RHIC and LHC