Production of phi mesons at mid-rapidity in sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC

Abstract

We present the first results of meson production in the K^+K^- decay channel from Au+Au collisions at sqrt(s_NN) = 200 GeV as measured at mid-rapidity by the PHENIX detector at RHIC. Precision resonance centroid and width values are extracted as a function of collision centrality. No significant variation from the PDG accepted values is observed. The 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. These data are also fitted by a hydrodynamic model with the result that the freeze-out temperature and the expansion velocity values are consistent with the values previously derived from fitting single hadron inclusive data. As a function of transverse momentum the collisions scaled peripheral.to.central yield ratio RCP for the is comparable to that of pions rather than that of protons. This result lends support to theoretical models which distinguish between baryons and mesons instead of particle mass for explaining the anomalous proton yield.

arXiv comment326 authors, 24 pages text, 23 figures, 6 tables, RevTeX 4. To be submitted to Physical Review C as a regular article. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
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• Parton coalescence at RHIC
• Absence of Suppression in Particle Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d+Au Collisions
• Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics
• High-p_T Charged Hadron Suppression in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Centrality dependence of pi^[+/-], K^[+/-], p and p-bar production from sqrt(s_NN)=130 GeV Au + Au collisions at RHIC
• Scaling properties of proton and anti-proton production in sqrt(s_NN) = 200 GeV Au + Au collisions
• The Status of Lattice QCD at Finite Temperature
• Can Gluons Trace Baryon Number?
• The RHIC Zero Degree Calorimeter
• Recombination of Shower Partons at High $p_T$ in Heavy-Ion Collisions
• Phi meson production in Au+Au and p+p collisions at sqrt (s)=200 GeV
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• Measurement of the mid-rapidity transverse energy distribution from $\sqrt{s_{NN}}=130$ GeV Au+Au collisions at RHIC
• Hydrodynamic afterburner for the Color Glass Condensate and the parton energy loss
• Phi decay in nuclei
• Modification of the $\varphi$-meson spectrum in nuclear matter
• Last Call for RHIC Predictions
• Phi meson mass and decay width in nuclear matter
• Centrality Dependence of the High p_T Charged Hadron Suppression in Au+Au collisions at sqrt(s_NN) = 130 GeV
• Baryon Number Transport via Gluonic Junctions
• Collision rates for $\bboxρ$, $\bboxω$ and $\bboxϕ$ mesons at nonzero temperature
• Jet Quenching and the p-bar >= pi- Anomaly at RHIC
• Phi meson production in relativistic heavy ion collisions
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• Seeing the QCD phase transition with phi mesons
• Phi meson propagation in a hot hadronic gas
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• Collision Broadening of the Phi Meson in Baryon Rich Hadronic Matter
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• Charged Kaon and Pion Production at Midrapidity in Proton Nucleus and Sulphur Nucleus Collisions
• Effective mass of phi mesons at finite temperature
• Identified Hadron Spectra From pp, dA and AA collisions

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