Abstract
We report on the yield of protons and antiprotons, as a function of centrality and transverse momentum, in collisions at measured at midrapidity by the PHENIX experiment at the BNL Relativistic Heavy Ion Collider. In central collisions at intermediate transverse momenta () a significant fraction of all produced particles are protons and antiprotons. They show a centrality-scaling behavior different from that of pions. The and ratios are enhanced compared to peripheral , , and collisions. This enhancement is limited to as deduced from the ratio of charged hadrons to measured in the range .
- Received 30 May 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.172301
©2003 American Physical Society