Rare semileptonic decays of B and B-c mesons in the relativistic quark modelстатья
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Дата последнего поиска статьи во внешних источниках: 3 мая 2017 г.
Аннотация:Rare semileptonic decays of B and B-c mesons are investigated in the framework of the QCD-motivated relativistic quark model based on the quasipotential approach. Form factors parametrizing the matrix elements of the weak transitions between corresponding meson states are calculated with the complete account of the relativistic effects including contributions of intermediate negative energy states and relativistic transformations of the meson wave functions. The momentum transfer dependence of the form factors is reliably determined in the whole accessible kinematical range. On this basis the total and differential branching fractions of the B -> K(*) l(+)l(-) (nu(nu) over bar), B-c -> D-s((*)) l(+)l(-) (nu(nu) over bar), B-c -> D-(*) l(+)l(-) (nu(nu) over bar) decays as well as the longitudinal polarization fractions F-L of the final vector meson and the muon forward-backward asymmetries A(FB) are calculated. Good agreement of the obtained results with the recent detailed experimental data on the B -> K(*) mu(+)mu(-) decays from Belle and CDF is found. Predictions for the rare semileptonic decays of the B-c mesons are given.