42 research outputs found

    Mixing Angle of Hadrons in QCD: A New View

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    A new method for calculation of the mixing angle between the hadrons within QCD sum rules is proposed. In this method, the mixing is expressed in terms of quark and gluon degrees of freedom. As an application, the detailed calculation of the mixing angle between heavy cascade baryons Xi_Q and Xi_Q', Q=c,~b is presented and it is found that the mixing angle between Xi_b (Xi_c) and Xi_b' (Xi_c') is given by theta_b = 6.4^\circ \pm 1.8 ^\circ (theta_c = 5.5^\circ \pm 1.8^\circ).Comment: 10 pages, 4 figures, 1 table, Changes in the text onl

    X(3872) and its Partners in the Heavy Quark Limit of QCD

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    In this letter, we propose interpolating currents for the X(3872) resonance, and show that, in the Heavy Quark limit of QCD, the X(3872) state should have degenerate partners, independent of its internal structure. Magnitudes of possible I=0 and I=1 components of the X(3872) are also discussed.Comment: 12 page

    Vector meson dominance and radiative decays of heavy spin-3/2 baryons to heavy spin--1/2 baryons

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    Using the calculated values of the strong coupling constants of the heavy sextet spin-3/2 baryons to sextet and antitriplet heavy spin-1/2 baryons with light mesons within the light cone QCD sum rules method, and vector meson dominance assumption, the radiative decay widths are calculated. These widths are compared with the "direct" radiative decay widths predicted in the framework of the light cone QCD sum rules.Comment: 8 pages, no figures, LaTeX formatte

    Unitary Structure of the QCD Sum Rules and KYN and KY\Xi Couplings

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    New relations between QCD Borel sum rules for strong coupling constants of K-mesons to baryons are derived. It is shown that starting from the sum rule for the coupling constants gπΣΣg_{\pi\Sigma\Sigma} and gπΣΛg_{\pi\Sigma\Lambda} it is straightforward to obtain corresponding sum rules for the gKYNg_{K Y N}, gKYΞg_{K Y \Xi} couplings, Y=Σ,ΛY=\Sigma,\Lambda.Comment: 7 pages, 2 tables, International Workshop on Quantum Chromodynamics:Theory and Experiment, QCD@Work-2005, Coversano(Bari, Italy), 16-20 June, 200

    Light vector meson octet-decuplet baryon vertices in QCD

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    The strong coupling constants between light vector mesons and octet-decuplet baryons are calculated in framework of the light cone QCD sum rules, taking into account SU(3) flavor symmetry breaking effects. It is shown that all strong coupling constants can be represented in terms of a single universal function. Size of the SU(3) symmetry breaking effects are estimated.Comment: 27 pages, 6 figures, LaTeX formatte