Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-04-25
Phys.Rev.Lett.104:132301,2010
Physics
Nuclear Physics
Nuclear Experiment
421 authors from 58 inst., 6 p., 4 figs. Sub. to PRL. v2 has minor changes to title, astract, and text. Data points for mass s
Scientific paper
10.1103/PhysRevLett.104.132301
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 as internal conversions, the invariant yield of direct photons is deduced. In central Au+Au collisions, the excess of direct photon yield over p+p is exponential in transverse momentum, with inverse slope T = 221 +/- 19 (stat) +/- 19 (syst) MeV. Hydrodynamical models with initial temperatures ranging from 300--600 MeV at times of ~ 0.6 - 0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at ~ 170 MeV.
Adare Andrew
the PHENIX Collaboration
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