575 research outputs found

    Elliptic Flow Measurements with the PHENIX Detector

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    Two particle azimuthal correlation functions are presented for charged hadrons produced in Au+Au collisions at RHIC (sNN=130\sqrt{s_{_{NN}}}=130 GeV). The measurements allow for the determination of elliptic flow without event-by-event estimation of the reaction plane. The measured correlation functions indicate elliptic flow values (v2v_2) which show significant sensitivity to both the collision centrality and the transverse momenta of emitted hadrons.Comment: Contribution to Quark Matter 2001, Long Island, New York, January 15-20, 200

    Recent results for source function imaging from AGS through CERN SPS to RHIC

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    Recent femtoscopic measurements involving the use of an imaging technique and a newly developed moment analysis are presented and discussed. We show that this new paradigm allows robust investigation of reaction dynamics for which the sound speed cs0c_s \neq 0 during an extended hadronization period. Source functions extracted for charged pions produced in Au+Au and Pb+Pb collisions show non-Gaussian tails for a broad selection of collision energies. The ratio of the RMS radii of these source functions in the out and side directions are found to be greater than 1, suggesting a finite emission time for pions.Comment: Proceedings, XXXVI International Symposium on Multiparticle Dynamics/Workshop on Particle Correlations and Femtoscopy, Brazil, 200

    Influence of finite volume and magnetic field effects on the QCD phase diagram

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    The Polyakov linear sigma model (PLSM) is used to investigate the respective influence of a finite volume and a magnetic field on the quark-hadron phase boundary in the plane of baryon chemical potential (μB\mu_{B}) vs. temperature (TT) of the QCD phase diagram. The calculated results indicate sizable shifts of the quark-hadron phase boundary to lower values of (μB and T)(\mu_{B}~\text{and}~T) for increasing magnetic field strength, and an opposite shift to higher values of (μB and T)(\mu_{B}~\text{and}~T) for decreasing system volume. Such shifts could have important implications for extraction of the thermodynamic properties of the QCD phase diagram from heavy ion data