Charged antiparticle to particle ratios near midrapidity in p+p collisions at {radical}(s{sub NN})=200 GeV
- Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
- Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 (United States); and others
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 {radical}(s{sub NN})=200 GeV. Ratios of <{pi}{sup -}/{pi}{sup +}>=1.000{+-}0.012 (stat.) {+-} 0.019 (syst.), <K{sup -}/K{sup +}>=0.93{+-}0.05 (stat.) {+-} 0.03 (syst.), and <p/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<y{sub {pi}}<1.3 and 0<y{sub K,p}<0.8, and for transverse momenta of 0.1<p{sub T}{sup {pi}}{sup ,K}<1.0 GeV/c and 0.3<p{sub T}{sup 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.
- OSTI ID:
- 20695919
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevC.71.021901; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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