Particle Composition at High p_T in Au+Au Collisions at sqrt(s_NN) = 200 GeV

Details Particle Composition at High p_T in Au+Au Collisions at sqrt(s_NN) = 200 GeV Particle Composition at High p_T in Au+Au Collisions at sqrt(s_NN) = 200 GeV

2003-08-18

arxiv.org/abs/nucl-ex/0308016v1

AIP Conf.Proc.698:732-734,2004

Physics

Nuclear Physics

Nuclear Experiment

3 pages, 2 figures, roceedings of CIPANP 2003, New York City, May 19-24, 2003

Scientific paper

10.1063/1.1664340

We report the recent results of proton and anti-proton yields as a function of centrality and p_T in Au+Au collisions at sqrt(s_NN) = 200 GeV, measured by the PHENIX experiment at RHIC. In central collisions at intermediate transverse momenta (1.5 < p_T < 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 p_T < 5 GeV/c as deduced from the ratio of charged hadrons to pi^0 measured in the range 1.5 < p_T < 9 GeV/c.

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