نتایج جستجو برای: baryon
تعداد نتایج: 9715 فیلتر نتایج به سال:
We consider the effect of including quark delocalization and color screening, in the nonrelativistic quark cluster model, on baryon-baryon potentials and phase shifts. We find that the inclusion of these additional effects allows a good qualitative description of both.
Possibility of kaon-condensed phase in hyperon-mixed matter is considered on the basis chiral symmetry for kaon-baryon and kaon-kaon interactions, being combined with relativistic mean-field theory two-body baryon interaction. In addition, universal three-baryon repulsive force string-junction model phenomenological three-nucleon attractive are introduced. It shown that softening equation state...
The purpose of this note is to investigate problems of baryon isobars from the viewpoint of the unitary symmetry model_ll In this model, the mass differences among mesons and among baryons are neglected. As the result, one may wonder if such a model can be applicable to the study of the baryon isobars which appear in the meson-baryon scattering, where these mass differences are certainly not ne...
We use a form of the fluctuation-dissipation theorem to derive formulas giving the rate of production of spin-1/2 baryons in terms of the fluctuations of either meson or quark fields. The most general formulas do not assume thermal or chemical equilibrium. When evaluated in a thermal ensemble we find equilibration times on the order of 10 fm/c near the critical temperature in QCD. PACS: 12.38.M...
Ohta proposed a solution for the well-known difficulty of satisfying the WardTakahashi identity for a photo-meson-baryon-baryon amplitude (γMBB) when a dressed meson-baryon-baryon (MBB) vertex function is present. He obtained a form for the γMBB amplitude which contained, in addition to the usual pole terms, longitudinal seagull terms which were determined entirely by the MBB vertex function. H...
Interactions of two baryons are considered in large NC chiral perturbation theory and compared to the interactions derived from the Skyrme model. Special attention is given to a torus-like configuration known to be present in the Skyrme model. PACS numbers 13.75.Cs, 12.39.Dc, 12.39.Fe, 12.40-y Typeset using REVTEX Electronic address: [email protected] 1
We calculate the weak nonleptonic decay of the Ω− baryon to octet final states in heavy baryon chiral perturbation theory (HBChPT). We include the one-loop leading logarithmic effects and show that this improves the universality of the HBChPT constants.
The QCD-string model for baryons derived by Simonov and used for the calculation of baryon magnetic moments in Ref. [1] is extended to include also perturbative gluon and meson exchanges. The mass spectrum of the baryon multiplet is studied. For the meson interaction either the pseudoscalar or pseudovector coupling is used. Predictions are compared with the experimental data. Besides these exch...
We develop perturbative QCD factorization theorems for the exclusive semileptonic heavy baryon decay Λb → plν̄, in which the relevant hadronic form factor is expressed as the convolution of a hard subamplitude with the Λb baryon wave function and the proton wave function. The specific evolution scale for the proton wave function, determined from the best fit to the data of the proton form factor...
A search for baryon-number violating Ξ_{b}^{0} oscillations is performed with a sample of pp collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb^{-1}. The baryon number at the moment of production is identified by requiring that the Ξ_{b}^{0} come from the decay of a resonance Ξ_{b}^{*-}→Ξ_{b}^{0}π^{-} or Ξ_{b}^{'-}→Ξ_{b}^{0}π^{-}, and the baryon n...
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