2,030 research outputs found

    Protection in the United States for “Famous Marks”: The Federal Trademark Dilution Act Revisited

    Get PDF

    Hypercentral constituent quark model and isospin dependence

    Get PDF
    The constituent quark model based on a hypercentral approach takes into account three-body force effects and standard two-body potential contributions. The quark potential contains a hypercentral interaction, to which a hyperfine term is added. While the hypercentral potential supplies good values for the centroid energies of the resonance multiplets and a realistic set of quark wave functions, the hyperfine splittings are sometimes not sufficient to account for the observed masses. In this work we have introduced an improved form of the hyperfine interaction and an isospin dependent quark potential. The resulting description of the baryon spectrum is very good, also for the Roper resonance, specially thanks to the flavour dependent interaction.Comment: 12 pages, 2 figures, accepted by Eur. Phys. J.

    Extra S11 and P13 in the Hypercentral Constituent Quark Model

    Get PDF
    We report on the recent results of the hypercentral Constituent Quark Model (hCQM). The model contains a spin independent three-quark interaction which is inspired by Lattice QCD calculations and reproduces the average energy values of the SU(6) multiplets. The splittings within each multiplet are obtained with a SU(6)-breaking interaction, which can include also an isospin dependent term. All the 3- and 4-stars resonances are well reproduced. Moreover, as all the Constituent Quark models, the hCQM predicts ``missing'' resonances ({\em e.g.} extra S11S11 and P13P13 states) which can be of some help for the experimental identification of new resonances. The model provides also a good description of the medium Q2Q^2-behavior of the electromagnetic transition form factors. In particular the calculated helicity amplitude A1/2A_{{1/2}} for the S11(1535)S_{11}(1535) resonance agrees very well with the recent CLAS data. More recently, the elastic nucleon form factors have been calculated using a relativistic version of the hCQM and a relativistic quark current.Comment: 7 pages,3 figures, Talk given at NStar 2002 workshop on the physics of excited nucleons, Pittsburgh, Pennsylvania, October 9-12, 200

    Electromagnetic Form Factors and the hCQM

    Full text link
    We briefly report on results about the electromagnetic form factors of the nucleon obtained with different models and then we concentrate our attention on recent results obtained with the hypercentral constituent quark model (hCQM).Comment: 12 pages, 5 figures, Invited talk at 27th Symposium on Nuclear Physics, Taxco, Guerrero, Mexico, 5-8 Jan 200
    • …
    corecore