Phys. Rev. C 71, 021901(R) (2005) [3 pages]Charged antiparticle to particle ratios near midrapidity in p+p collisions at √sNN=200 GeV
The ratios of the yields of primary charged antiparticles to particles have been obtained for pions, kaons, and protons near midrapidity for p+p collisions at √sNN=200 GeV. Ratios of 〈π-/π+〉=1.000±0.012 (stat.) ± 0.019 (syst.), 〈K-/K+〉=0.93±0.05 (stat.) ± 0.03 (syst.), and 〈p̅ /p〉=0.85±0.04 (stat.) ± 0.03 (syst.) have been measured. The reported values represent the ratio of the yields averaged over the rapidity range of 0.1<yπ<1.3 and 0<yK,p<0.8, and for transverse momenta of 0.1<pTπ,K<1.0 GeV/c and 0.3<pTp<1.0 GeV/c. Within the uncertainties, all three ratios are consistent with the values measured in d+Au collisions at the same energy. The data are compared to results from other collision systems and energies. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.021901
DOI:
10.1103/PhysRevC.71.021901
PACS:
25.75.-q
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