Abstract
We report on the yield of protons and antiprotons, as a function of centrality and transverse momentum, in Au+Au collisions at √sNN=200 GeV measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider. In central collisions at intermediate transverse momenta (1.5<pT<4.5 GeV/c) a significant fraction of all produced particles are protons and antiprotons. They show a centrality-scaling behavior different from that of pions. The ¯p/π and p/π 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 π0 measured in the range 1.5<pT<9 GeV/c.
Original language | English |
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Article number | 172301 |
Journal | Physical Review Letters |
Volume | 91 |
DOIs | |
Publication status | Published - 2003 |