647 research outputs found

    Mesons in non-local chiral quark models

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    Vector meson correlators are studied in effective chiral quark models with both local and non-local regulators. A set of sum rules based on dispersion relations is derived, which allows for a comparison of model predictions to data. We show that the two Weinberg sum rules for vector correlators hold in the non-local model.Comment: 10 pp., presented at International Workshop on Hadron Physics: Effective Theories of Low-Energy QCD, 10-15 September 1999, Coimbra, Portuga

    Chiral waves in quark matter

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    A mini-review of non-uniform phases in quark matter is presented, with particular attention to the pion condensation, also known as chiral density waves or chiral spirals. The phase diagram of strongly-interacting matter may involve such a phase, placed on the quarkyonic island between the baryonic phase and the chirally-restored quark-gluon plasma.Comment: 10 pages, 3 figures, presented at HIC for FAIR Workshop, XXVIII Max Born Symposium "Three days on Quarkyonic Island", Wroclaw, poland, 19-21 May 201

    Transverse energy per charged particle at relativistic energies from a statistical model with expansion

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    Transverse energy and charged particle pseudorapidity densities at midrapidity and their ratio, dET/dηmid/dNch/dηmiddE_{T}/d\eta\mid_{mid} / dN_{ch}/d\eta|_{mid}, are evaluated in a statistical model with longitudinal and transverse flows for the wide range of colliders, from AGS to RHIC at sNN=200\sqrt{s_{NN}}=200 GeV. Evaluations are done at freeze-out parameters established independently from fits to observed particle yields and pTp_{T} spectra. Decays of hadron resonances are treated thoroughly and are included in derivations of dET/dηmiddE_{T}/d\eta|_{mid} and dNch/dηmiddN_{ch}/d\eta|_{mid}. The predictions of the model agree well with the experimental data. However, some (explicable) overestimation of the ratio has been observed.Comment: Revtex, 11 pages, 1 figure (included), The revised version with the title changed and new conclusions added, to appear in Eur. Phys. J.

    Longitudinal correlations in the initial stages of ultra-relativistic nuclear collisions

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    In this talk we review some of our results for the longitudinal correlations in connection with recent experimental data, in particular for the {\em torque} effect and for the two-particle correlations in pseudorapidity, C(η1,η2)C(\eta_1,\eta_2). The model framework involves event-by-event fluctuations of the initial conditions, followed with 3D viscous hydrodynamic evolution and statistical hadronization.Comment: 6 pages, talk presented by WB at ISMD 201