Preliminary Results on Direct Photon-Photon HBT Measurements in sNN = 62.4 GeV and 200 GeV Au+Au Collisions at RHIC
Debasish Das, Guoji Lin, Subhasis Chattopadhyay, Alexei Chikanian, Evan Finch, Tapan K Nayak, Sergey Y Panitkin, Jack Sandweiss, Alexandre Alarcon Suaide, Haibin Zhang
Abstract
We present the preliminary results on direct photon interferometry measurements in Au+Au collisions at sNN = 62.4 and 200 GeV using the STAR (Solenoidal Tracker at RHIC) detector. Photons are reconstructed via e+/e- conversions in STAR Time Projection Chamber(TPC) and energy deposited by photons in STAR Barrel Electromagnetic Calorimeter(BEMC). The two-photon correlations are measured using (1) both photons measured using BEMC; (2) one photon from conversions and the other measured with BEMC. Both the methodologies and the possible constraints in the correlation function measurements are discussed.
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