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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 543840.0, MPI für Physik / MPI für Physik
Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
Authors:STAR Collaboration; Abelev, B.; Eckardt, V.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:75
Start Page:064901
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We present strange particle spectra and yields measured at mid-rapidity in $\sqrt{\text{s}}=200$ GeV proton-proton ($p+p$) collisions at RHIC. We find that the previously observed universal transverse mass ($\mathrm{m_{T}}\equiv\sqrt{\mathrm{p_{T}}^{2}+\mathrm{m}^{2}}$) scaling of hadron production in $p+p$ collisions seems to break down at higher \mt and that there is a difference in the shape of the \mt spectrum between baryons and mesons. We observe mid-rapidity anti-baryon 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 (\mpt) 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 to previous measurements from CERN-SPS, ISR and FNAL experiments and to Leading Order (LO) and Next to Leading order (NLO) 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 quark jets.
Classification / Thesaurus:STAR
Comment of the Author/Creator:22 pages, 20 figures, 11 tables, submitted to Phys. Rev. C
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2007-246
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/nucl-ex/0607033
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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