Centrality Dependence ofπ+/−,K+/−,p, andp¯Production fromsNN=130GeVAu + Au Collisions at RHIC

Identified ${\pi }^{+/-}$, $K^{+/-}$, $p$, and $\overline{p}$ transverse momentum spectra at midrapidity in $\sqrt{s_{\mathrm{NN}}}=130\mathrm{GeV}\mathrm{Au}+\mathrm{Au}$ 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 $\overline{p}$ yields per participant increase faster than the ${\pi }^{+/-}$ yields. In central collisions at high transverse momenta $(p_T\gtrsim 2\mathrm{GeV}/c)$, $\overline{p}$ and $p$ yields are comparable to the ${\pi }^{+/-}$ yields.