Measurement of photons via conversion pairs in Au+Au collisions at sqrt(sNN) = 200 GeV with the PHENIX experiment at RHIC
Abstract
Thermal photons can provide information on the temperature of the new state of matter created at RHIC. In the pT 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(pi0))Measured/(gamma/gamma(pi0))Simulated, if sufficient accuracy can be reached. We present a method to reconstruct direct photons by measuring e+e- pairs from external photon conversions.
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