Measurements of Photon and Neutral Pion Production in Heavy Ion Collisions at RHIC

摘要

Inclusive transverse momentum spectra of photons and neutral pions aboutmid-rapidity are presented for Au+Au collisions at sqrt(s_NN} = 130 GeV. Photonpair conversions have been reconstructed from charged tracks measured with thecentral Time Projection Chamber (TPC) of STAR. Contributions of the pi^0 ->gammagamma decay in the inclusive photon spectra have been studied. It wasfound that this contribution begins to decrease at a transverse momentum of1.65 GeV/c in the top 11% most central centrality class.