Regular Article – Experimental Physics
Measurement of photons via conversion pairs in =200 GeV Au+Au collisions with the PHENIX experiment at RHIC
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794-3800, USA
* e-mail: Torsten.Dahms@stonybrook.edu
Published online: 27 October 2006
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 (γ/γ(π0))Measured/(γ/γ(π0))Simulated, if sufficient accuracy can be reached. We present a method to reconstruct direct photons by measuring e+e--pairs from external photon conversions.
© Springer-Verlag Berlin Heidelberg, 2007