40 research outputs found

    The PHENIX Experiment at RHIC

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    The physics emphases of the PHENIX collaboration and the design and current status of the PHENIX detector are discussed. The plan of the collaboration for making the most effective use of the available luminosity in the first years of RHIC operation is also presented.Comment: 5 pages, 1 figure. Further details of the PHENIX physics program available at http://www.rhic.bnl.gov/phenix

    Overview of Phenix results from the first RHIC run

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    Low mass dilepton production at RHIC energies

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    EIRecent results on low mass dilepton measurements from the PHENIX experiment are reported. Invariant mass spectra of ϕ−>e+e−\phi-> e+e- are measured for the first time in Au-Au collisions at SNN=200GeV\sqrt{^{S}NN} = 200 GeV in Run2. In d-Au collisions, the yields and MT slopes of both ϕ−>e+e−\phi ->e+e- and ϕ−>K+K−\phi-> K+K- are measured. Both results are consistent with each other within errors. In the future, a Hadron Blind Detector will be installed in PHENIX which will enhance our capabilities of rejecting external photon conversions and Dalitz pairs, that will result in a significant reduction of the large combinatorial background

    Quarkonium production from d+Au to Au+Au collisions

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    M. Rosati on behalf of the PHENIX Collaboration EIThe PHENIX experiment measured J/ψ\psi production in pp, d+Au and Au+Au reactions at \sqrt{^sNN}=200GeVoverawiderangeofrapidityandtransversemomentum.Thenuclearmodificationfactorobtainedbycomparingthed+Auandppcrosssectionsasafunctionofrapidity,isconsistentwithshadowingofthegluondistributionfunctions.J/ = 200 GeV over a wide range of rapidity and transverse momentum. The nuclear modification factor obtained by comparing the d+Au and pp cross sections as a function of rapidity, is consistent with shadowing of the gluon distribution functions. J/\psi$ production in Au+Au collisions was compared to the production in pp collisions and it was found to be inconsistent with models that predict strong enhancement relative to binary collision scaling

    Differential probes of medium-induced energy loss

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    B. Cole on behalf of the PHENIX Collaboration -EIResults from the PHENIX experiment of measurements of high- pTp_{\rm T} particle production presented at the Hard Probes 2004 Conference are summarized. This paper focuses on a sub-set of the measurements presented at the conference, namely the suppression of π0\pi^0 production at moderate to high pTp_{\rm T} as a function of angle with respect to the collision reaction plane, Δϕ\Delta\phi , for different collision centralities. The data are presented in the form of nuclear modification factor as a function of angle with respect to the reaction plane, RAA(Δϕ)R_{AA} (\Delta \phi) . The data are analyzed using empirical estimates of the medium-induced energy loss obtained from the RAA(Δϕ)R_{AA} (\Delta \phi) values. A geometric analysis is performed with the goal of understanding the simultaneous dependence of RAA on Δϕ\Delta\phi and centrality. We find that the centrality and Δϕ\Delta\phi dependence of the π0\pi^0 suppression can be made approximately consistent using an admittedly over-simplistic description of the geometry of the jet propagation in the medium but only if the energy loss is effectively reduced for short parton path lengths in the medium. We find that with a more "canonical" treatment of the quenching geometry, the π0\pi^0 suppression varies more rapidly with Δϕ\Delta\phi than would be expected from the centrality dependence of the suppression