Particle Composition at High pT in Au+Au Collisions at sqrt(sNN) = 200 GeV
Abstract
We report the recent results of proton and anti-proton yields as a function of centrality and pT in Au+Au collisions at sqrt(sNN) = 200 GeV, measured by the PHENIX experiment at RHIC. In central collisions at intermediate transverse momenta (1.5 < pT < 4.5 GeV/c) a significant fraction of all produced particles is protons and anti-protons. They show a different scaling behavior from that of pions. The pbar/pi and p/pi ratios are enhanced compared to peripheral Au+Au, p+p and e+e- collisions. This enhancement is limited to pT < 5 GeV/c as deduced from the ratio of charged hadrons to pi0 measured in the range 1.5 < pT < 9 GeV/c.
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