Measurement of photons via conversion pairs in Au+Au collisions at sqrt(s_NN) = 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 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.

8 pages, 4 figures. To appear in the proceedings of the 23rd Winter Workshop on Nuclear Dynamics, Big Sky (Montana), USA, 11-18 February 2007

References in corpus (7)

• Hadronic Production of Thermal Photons
• Centrality Dependence of Direct Photon Production in sqrt(s_NN) = 200 GeV Au+Au Collisions
• Common Suppression Pattern of eta and pi^0 Mesons at High Transverse Momentum in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Centrality Dependence of Charm Production from Single Electrons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Systematic Study of High-pT Direct Photon Production with the PHENIX Experiment at RHIC
• Direct photons in 200 GeV p+p, d+Au, and Au+Au from PHENIX
• Search for Direct Photons from $\sqrt{s_{NN}}=200GeV$ AuAu Collisions Using a New ${\pi }^0$ Tagging Method in the PHENIX Experiment at RHIC