Charged antiparticle to particle ratios near midrapidity in p + p collisions at √sNN = 200 GeV

B. B. Back, M. D. Baker, M. Ballintijn, D. S. Barton, B. Becker, R. R. Betts, A. A. Bickley, R. Bindel, W. Busza, A. Carroll, M. P. Decowski, E. García, T. Gburek, N. George, K. Gulbrandsen, S. Gushue, C. Halliwell, J. Hamblen, A. S. Harrington, C. HendersonD. J. Hofman, R. S. Hollis, R. Hołyński, B. Holzman, A. Iordanova, E. Johnson, J. L. Kane, N. Khan, P. Kulinich, C. M. Kuo, J. W. Lee, W. T. Lin, S. Manly, A. C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, I. C. Park, H. Pernegger, C. Reed, C. Roland, G. Roland, J. Sagerer, P. Sarin, I. Sedykh, W. Skulski, C. E. Smith, P. Steinberg, G. S.F. Stephans, A. Sukhanov, M. B. Tonjes, A. Trzupek, C. Vale, G. J. Van Nieuwenhuizen, R. Verdier, G. I. Veres, F. L.H. Wolfs, B. Wosiek, K. Woźniak, B. Wysłouch, J. Zhang

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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 (p̄/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 < y K,p < 0.8, and for transverse momenta of 0.1 < p Tπ,K < 1.0 GeV/c and 0.3 < pT p < 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.

Original languageEnglish
Article number021901
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - Feb 2005


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