82 research outputs found

    Strangeness in QGP: Hadronization Pressure

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    We review strangeness as signature of quark gluon plasma (QGP) and the hadronization process of a QGP fireball formed in relativistic heavy-ion collisions in the entire range of today accessible reaction energies. We discuss energy dependence of the statistical hadronization parameters within the context of fast QGP hadronization. We find that QGP breakup occurs for all energies at the universal hadronization pressure P=80±3MeV/fm3P = 80\pm 3\,\mathrm{MeV/fm}^3 .Comment: 14 pages, one picture, 10 figures, Talk presented at the XXXI Max Born Symposium and HIC for FAIR Workshop "Three Days of Critical Behavior in Hot and Dense QCD", Wroclaw, Poland, June~14-16, 2013. Acta Physica Polonica B: Conference Series in pres

    Strangeness Production in Au--Au collisions at sNN=62.4\sqrt{s_{NN}}=62.4 GeV

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    We obtain strangeness production as function of centrality in a statistical hadronization model analysis of all experimental hadron production data in Au--Au collisions at \sqrt{s_{NN}}=62.4\GeV. Our analysis describes successfully the yield of strange and multi-strange hadrons recently published. We explore condition of hadronization as a function of centrality and find universality for the case of chemical non-equilibrium in the hadron phase space corresponding to quark--gluon plasma (QGP) in chemical equilibrium.Comment: 6 pages, 2 figures, proceedings for SQM 2011 conferenc

    QCD phase transition studied by means of hadron production

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    This is a brief review of our work describing the hadronization process of a QGP fireball formed in relativistic heavy-ion collisions. We introduce the SHARE method of analysis of hadron multiplicities. Using this tool we describe in consistent continuos manner the yield of all hadrons produced in the available range of reaction energies and centralities. The properties of the fireball final state can be understood by considering all primary hadronic particles. The dense hadron fireball created at SPS, RHIC, and LHC shows that the final state is differentiated solely by: i) volume changes; and ii) flavor (strangeness, charm) content. Conversely, emerging particles add up to create universal hadronization pressure P=80±3P = 80 \pm 3 MeV/fm3^3 for all considered collision systems. The relative strangeness to entropy content of a large fireball is found to be that of quark-gluon plasma degrees of freedom near the chemical QGP equilibrium. This 'Universal Hadronization' condition common to SPS, RHIC, and LHC agrees with the proposed reaction picture of a direct QGP fireball evaporation into free-streaming hadrons.Comment: 11 pages, many figures; Presented in Wroclaw at the February 2014 MB32-Symposium honoring Ludwik Turk

    Hadron production and QGP Hadronization in Pb--Pb collisions at sNN=2.76\sqrt{s_{NN}}=2.76 TeV

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    We show that all central rapidity hadron yields measured in Pb--Pb collisions at sNN=2.76\sqrt{s_{NN}}=2.76 TeV are well described by the chemical non-equilibrium statistical hadronization model (SHM), where the chemically equilibrated QGP source breaks up directly into hadrons. SHM parameters are obtained as a function of centrality of colliding ions, and we compare CERN Large Hadron Collider (LHC) with Brookhaven National Laboratory Relativistic Heavy Ion Collider (RHIC) results. We predict yields of unobserved hadrons and address anti-matter production. The physical properties of the quark--gluon plasma fireball particle source show universality of hadronization conditions at LHC and RHIC.Comment: 22 pages, 16 figures, 6 table

    Long-range angular correlations on the near and away side in p–Pb collisions at

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    Underlying Event measurements in pp collisions at s=0.9 \sqrt {s} = 0.9 and 7 TeV with the ALICE experiment at the LHC

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    The OZI Rule in Meson Decay

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    This presentation nequires the knowledge about meson decayThis Demonstration shows the OZI rule applied in the decay of one meson into two. This rule determines which strong processes are preferred and which are allowed but strongly suppressedComponente Curricular::Educação Superior::Ciências Exatas e da Terra::Físic
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