The transverse momentum ($p_T$) spectra and ratios of identified charged hadrons (${\pi }^{\pm }$, $K^{\pm }$, $p$, $\overline{p}$) produced in $\sqrt{s_{{}_{NN}}}=200$ GeV $\mathrm{Au}+\mathrm{Au}$ and $d+\text{Au}$ collisions are reported in five different centrality classes for each collision species. The measurements of pions and protons are reported up to $p_T=6$ GeV/$c$ (5 GeV/$c$), and the measurements of kaons are reported up to $p_T=4$ GeV/$c$ (3.5 GeV/$c$) in $\mathrm{Au}+\mathrm{Au}$ ($d+\text{Au}$) collisions. In the intermediate $p_T$ region, between 2 and 5 GeV/$c$, a significant enhancement of baryon-to-meson ratios compared to those measured in $p+p$ collisions is observed. This enhancement is present in both $\mathrm{Au}+\mathrm{Au}$ and $d+\text{Au}$ collisions and increases as the collisions become more central. We compare a class of peripheral $\mathrm{Au}+\mathrm{Au}$ collisions with a class of central $d+\text{Au}$ collisions which have a comparable number of participating nucleons and binary nucleon-nucleon collisions. The $p_T$-dependent particle ratios for these classes display a remarkable similarity, which is then discussed.

• Received 12 April 2013

DOI:https://doi.org/10.1103/PhysRevC.88.024906