Abstract
The PHENIX experiment at RHIC has measured neutral pion, eta, and direct photon production in sNN = 200 GeV p+p and Au+Au collisions. The neutral pion and direct photon yields in p+p collisions are well described by NLO pQCD predictions. In Au+Au collisions the neutral pion yield is suppressed as compared to expectations from p+p collisions, with a suppression which increases with increasing nuclear overlap. However, the direct photon yield shows no centrality dependent suppression, indicating that the pion suppression is due to a final state effect, such as parton energy loss in the excited final state.
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