Centrality dependence of charged antiparticle to particle ratios near midrapidity in $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$

Rapid Communication

Centrality dependence of charged antiparticle to particle ratios near midrapidity in $d + Au$ collisions at $\sqrt{s_{N N}} = 200 GeV$

B. B. Back et al. (PHOBOS Collaboration)

Phys. Rev. C 70, 011901(R) – Published 1 July 2004

Abstract

The ratios of the yields of charged antiparticles to particles have been obtained for pions, kaons, and protons near midrapidity for $d + Au$ collisions at $\sqrt{s_{N N}} = 200 GeV$ as a function of centrality. The reported values represent the ratio of the yields averaged over the rapidity range of $0.1 < y_{π} < 1.3$ and $0 < y_{K, p} < 0.8$ , where positive rapidity is in the deuteron direction, and for transverse momenta $0.1 < p_{T}^{π, K} < 1 GeV ∕ c$ and $0.3 < p_{T}^{p} < 1 GeV ∕ c$ . 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.