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The production of low mass e+e- pairs for m_{e+e-} < 300 MeV/c^2 and 1 < p_T<5 GeV/c is measured in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV.Enhanced yield above hadronic sources is observed. Treating the excess asinternal conversions, the invariant yield of direct photons is deduced. Incentral Au+Au collisions, the excess of direct photon yield over p+p isexponential in transverse momentum, with inverse slope T = 221 +/- 19 (stat)+/- 19 (syst) MeV. Hydrodynamical models with initial temperatures ranging from300--600 MeV at times of ~ 0.6 - 0.15 fm/c after the collision are inqualitative agreement with the data. Lattice QCD predicts a phase transition toquark gluon plasma at ~ 170 MeV.

Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature