Strange particle production in p+p collisions at {radical}(s)=200 GeV

Journal Article · Fri Jun 15 00:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.064901· OSTI ID:21003486

Abelev, B I; Bielcik, J; Bielcikova, J; Caines, H; Catu, O; Chikanian, A; Du, F; Finch, E; Harris, J W; Heinz, M; Lamont, M A. C.; Lin, G; Majka, R; Nattrass, C; Salur, S; Sandweiss, J; Smirnov, N; Witt, R ^[1]; Adams, J; Barnby, L S ^[2]

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1. Yale University, New Haven, Connecticut 06520 (United States)
2. University of Birmingham, Birmingham (United Kingdom)

We present strange particle spectra and yields measured at midrapidity in {radical}(s)=200 GeV proton-proton (p+p) collisions at the BNL Relativistic Heavy Ion Collider (RHIC). We find that the previously observed universal transverse mass (m{sub T}{identical_to}{radical}(p{sub T}{sup 2}+m{sup 2})) scaling of hadron production in p+p collisions seems to break down at higher m{sub T} and that there is a difference in the shape of the m{sub T} spectrum between baryons and mesons. We observe midrapidity antibaryon to baryon ratios near unity for {lambda} and {xi} baryons and no dependence of the ratio on transverse momentum, indicating that our data do not yet reach the quark-jet dominated region. We show the dependence of the mean transverse momentum <p{sub T}> on measured charged particle multiplicity and on particle mass and infer that these trends are consistent with gluon-jet dominated particle production. The data are compared with previous measurements made at the CERN Super Proton Synchrotron and Intersecting Storage Rings and in Fermilab experiments and with leading-order and next-to-leading-order string fragmentation model predictions. We infer from these comparisons that the spectral shapes and particle yields from p+p collisions at RHIC energies have large contributions from gluon jets rather than from quark jets.

• OSTI ID: 21003486
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevC.75.064901; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). STAR Collaboration; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTIBARYONS
BNL
BROOKHAVEN RHIC
COMPARATIVE EVALUATIONS
FERMILAB
GEV RANGE 100-1000
GLUONS
INCLUSIVE INTERACTIONS
JETS
MASS
MESONS
NUCLEAR FRAGMENTATION
NUCLEAR MODELS
PARTICLE PRODUCTION
PROTON-PROTON INTERACTIONS
PROTONS
QUARKS
STRANGE PARTICLES
SYNCHROTRONS
TRANSVERSE MOMENTUM