Identified Baryon and meson distributions at large transverse momenta from Au+Au collisions at VsNN=200 GeV

Abstract

Transverse momentum spectra of π±, p, and p̅ up to 12 GeV/c at midrapidity in centrality selected Au+Au collisions at VsNN=200 GeV are presented. In central Au+Au collisions, both π± and p(p̅ ) show significant suppression with respect to binary scaling at pT≳4 GeV/c. Protons and antiprotons are less suppressed than π±, in the range 1.5≲pT≲6 GeV/c. The π-/π+ and p̅ /p ratios show at most a weak pT dependence and no significant centrality dependence. The p/π ratios in central Au+Au collisions approach the values in p+p and d+Au collisions at pT≳5 GeV/c. The results at high pT indicate that the partonic sources of π±, p, and p̅ have similar energy loss when traversing the nuclear medium.