Strange Particle Production in $p+p$ Collisions at $$\sqrt{s}$$= 200GeV
We present strange particle spectra and yields measured atmid-rapidity in sqrt text s=200 GeV proton-proton (p+p) collisions atRHIC. We find that the previously observed universal transverse mass(mathrm mT \equiv\sqrt mathrm p_T 2+\mathrm m2) scaling of hadronproduction in p+p collisions seems to break down at higher \mt and thatthere is a difference in the shape of the \mt spectrum between baryonsand mesons. We observe mid-rapidity anti-baryon to baryon ratios nearunity for Lambda and Xi baryons and no dependence of the ratio ontransverse momentum, indicating that our data do not yet reach thequark-jet dominated region. We show the dependence of the mean transversemomentum (\mpt) on measured charged particle multiplicity and on particlemass and infer that these trends are consistent with gluon-jet dominatedparticle production. The data are compared to previous measurements fromCERN-SPS, ISR and FNAL experiments and to Leading Order (LO) and Next toLeading order (NLO) string fragmentation model predictions. We infer fromthese comparisons that the spectral shapes and particle yields from $p+p$collisions at RHIC energies have large contributions from gluon jetsrather than quark jets.
- Research Organization:
- COLLABORATION - Brookhaven NationalLaboratory
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 932578
- Report Number(s):
- LBNL-63640; R&D Project: NRNC; TRN: US0803564
- Journal Information:
- Physical Review C, Vol. 75; Related Information: Journal Publication Date: 06/04/2007
- Country of Publication:
- United States
- Language:
- English
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