Charged Antiparticle To Particle Ratios Near Midrapidity In P+P Collisions At Root S(Nn)=200 Gev

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

PHYSICAL REVIEW C（2005）

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Abstract

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 s(NN)=200 GeV. Ratios of =1.000+/-0.012 (stat.) +/- 0.019 (syst.), =0.93+/-0.05 (stat.) +/- 0.03 (syst.), and <(p) over bar /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 0.1More

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