Centrality dependence of charged antiparticle to particle ratios near midrapidity in d+Au collisions at sNN=200GeV

Abstract

The ratios of the yields of charged antiparticles to particles have been obtained for pions, kaons, and protons near midrapidity for $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ as a function of centrality. The reported values represent the ratio of the yields averaged over the rapidity range of $0.1<{y}_{\ensuremath{\pi}}<1.3$ and $0<{y}_{K,p}<0.8$, where positive rapidity is in the deuteron direction, and for transverse momenta $0.1<{p}_{T}^{\ensuremath{\pi},K}<1\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}∕c$ and $0.3<{p}_{T}^{p}<1\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}∕c$. Within the uncertainties, a lack of centrality dependence is observed in all three ratios. The data are compared to results from other systems and model calculations.