Production of {phi} mesons at midrapidity in {radical}(s{sub NN})=200 GeV Au+Au collisions at relativistic energies

Journal Article · Fri Jul 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.014903· OSTI ID:20698846

Adler, S S; Aidala, C; Aronson, S H; Chujo, T; David, G; Desmond, E J; Ewell, L; Franz, A; Guryn, W; Haggerty, J S; Harvey, M; Johnson, B M; Kistenev, E; Kroon, P J; Makdisi, Y I; Mioduszewski, S; Mitchell, J T; Morrison, D P; O'Brien, E; Pinkenburg, C ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States); and others

We present the results of {phi} meson production in the K{sup +}K{sup -} decay channel from Au+Au collisions at {radical}(s{sub NN})=200 GeV as measured at midrapidity by the PHENIX detector at Brookhaven National Laboratory's Relativistic Heavy Ion Collider. Precision resonance centroid and width values are extracted as a function of collision centrality. No significant variation from the Particle Data Group accepted values is observed, contrary to some model predictions. The {phi} transverse mass spectra are fitted with a linear exponential function for which the derived inverse slope parameter is seen to be constant as a function of centrality. However, when these data are fitted by a hydrodynamic model the result is that the centrality-dependent freeze-out temperature and the expansion velocity values are consistent with the values previously derived from fitting identified charged hadron data. As a function of transverse momentum the collisions scaled peripheral-to-central yield ratio R{sub CP} for the {phi} is comparable to that of pions rather than that of protons. This result lends support to theoretical models that distinguish between baryons and mesons instead of particle mass for explaining the anomalous (anti) proton yield.

• OSTI ID: 20698846
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BROOKHAVEN RHIC
GEV RANGE
GOLD 197 REACTIONS
GOLD 197 TARGET
HYDRODYNAMIC MODEL
KAONS MINUS
KAONS PLUS
MASS SPECTRA
MULTIPARTICLE SPECTROMETERS
NUCLEAR REACTION YIELD
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PHI-1020 MESONS
PHI-1680 MESONS
PIONS
PROTONS
RELATIVISTIC RANGE
REST MASS
TRANSVERSE MOMENTUM