Abstract
PHENIX results on direct photon production in p+p, d+Au, Cu+Cu and Au+Au collisions are presented. Direct photon yield at high pT is consistent with NLO pQCD calculations in all systems. In heavy ion collisions at low pT direct photons exhibit an order of magnitude exponential shape enhancement consistent with thermal emission from quark gluon plasma (QGP). The thermal nature of this enhancement is further confirmed by the large elliptic flow of direct photons below pT ∼ 5 GeV/c.
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