Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.132301
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Funding
- Department of Energy (USA)
- NSF (USA)
- MEXT (Japan)
- JSPS (Japan)
- CNPq (Brazil)
- FAPESP (Brazil)
- NSFC (China)
- MSMT (Czech Republic)
- IN2P3/CNRS (France)
- CEA (France)
- BMBF (Germany)
- DAAD (Germany)
- AvH (Germany)
- OTKA (Hungary)
- DAE (India)
- ISF (Israel)
- NRF (Korea)
- MES (Russia)
- RAS (Russia)
- FAAE (Russia)
- V.R. (Sweden)
- KAW (Sweden)
- U.S. CRDF
- US-Hungarian NSF-OTKA-MTA
- US-Israel BSF
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The production of e(+)e(-) pairs for m(e+e-) < 0.3 GeV/c(2) and 1< p(T) < 5 GeV/c is measured in p + p and Au + Au collisions at root s(NN) = 200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au + Au collisions, the excess of the direct photon yield over p + p is exponential in transverse momentum, with an inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar to 300-600 MeV at times of similar to 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 similar to 170 MeV.
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