Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-11-26
Physics
Nuclear Physics
Nuclear Experiment
8 pages, 4 figures. To appear in the proceedings of the 23rd Winter Workshop on Nuclear Dynamics, Big Sky (Montana), USA, 11-1
Scientific paper
Thermal photons can provide information on the temperature of the new state of matter created at RHIC. In the p_T region of 1--3 GeV/c thermal photons are expected to be the dominant direct photon source. Therefore, a possible excess compared to a pure decay photon signal due to a thermal photon contribution should be seen in the double ratio (gamma/gamma(pi^0))_{Measured}/(gamma/gamma(pi^0))_{Simulated}, if sufficient accuracy can be reached. We present a method to reconstruct direct photons by measuring e^+e^- pairs from external photon conversions.
Dahms Torsten
for the PHENIX Collaboration
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