Centrality dependence of π^+/-, K^+/-, p, and p^- production from √s_NN=130 GeV Au + Au collisions at RHIC

Abstract

Identified π^+/-, K^+/-, p, and p^- transverse momentum spectra at midrapidity in √s_NN = 130 GeV Au+Au collisions were measured by the PHENIX experiment at RHIC as a function of collision centrality. Average transverse momenta increase with the number of participating nucleons in a similar way for all particle species. Within errors, all midrapidity particle yields per participant are found to be increasing with the number of participating nucleons. There is an indication that K^+/-, p, and p^- yields per participant increase faster than the π^+/- yields. In central collisions at high transverse momenta (p_T 2GeV/c), p^- and p yields are comparable to the π^+/- yields.