PHENIX Direct Photons in 200 GeV p+p and Au+Au Collisions
Abstract
We present the first positive direct photon results in Au+Au at sqrtsNN = 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 pT = 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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