Charged antiparticle to particle ratios near midrapidity in p+p collisions at {radical}(s{sub NN})=200 GeV

Journal Article · Tue Feb 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.021901· OSTI ID:20695919

Back, B B ^[1]; Baker, M D; Barton, D S; Becker, B; Carroll, A; George, N; Gushue, S; Holzman, B; Pak, R; Sedykh, I; Steinberg, P; Sukhanov, A ^[2]; Ballintijn, M; Busza, W; Decowski, M P; Gulbrandsen, K; Henderson, C; Kane, J L; Kulinich, P; Lee, J W ^[3]

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1. Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
2. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
3. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEUTERON REACTIONS
GEV RANGE
GOLD 197 TARGET
KAONS MINUS
KAONS PLUS
NUCLEAR REACTION YIELD
PARTICLE RAPIDITY
PIONS MINUS
PIONS PLUS
PROTON-NUCLEON INTERACTIONS
PROTONS
TRANSVERSE MOMENTUM