Strange particle production in p + p collisions at {radical}{ovr s} = 200 GeV.
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} {triple_bond} {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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Swiss NSF
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 966040
- Report Number(s):
- ANL-HEP-PR-09-71; PRVCAN; TRN: US0904026
- Journal Information:
- Phys. Rev. C, Vol. 75, Issue 2006; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- ENGLISH
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