Determination of the neutron / gamma separation threshold on single crystals of stilbene

Section V. Equipment, Methods and Automation of Nuclear Experiments, Interaction of Nuclear Radiation with the Matter and Applications of Methods of Nuclear Physic

Anomalies in Weak Decays of Hadrons Containing a b Quark

A brief review of the current state of observed deviations of theoretical predictions from experimental data in semileptonic decays of $B$ and $B_c$ mesons is given. A theoretical analysis of these decays is carried out, taking into account the effects of new physics, which appear due to the introduction of new four-fermion operators, which are absent in the basis of the Standard Model (SM) operators. The necessary form factors are calculated within the framework of the covariant quark model developed in our papers.Comment: Contribution to: International Conference on Quantum Field Theory, High-Energy Physics, and Cosmolog

Semileptonic decays of Bc mesons into charmonium states

In this work we study the semileptonic decays of Bc meson. We evaluated Bc→ D D * ,     B c →   D s D s * and Bc→ηc→ J / ψ transitions form factors in the full kinematical region within the covariant quark model. The calculated form factors are used to evaluate the semileptonic decays of Bc meson and it was defined ratios (Rηc , RJ/ψ, RD ,RD*) of the branching ratios, which will be hopefully tested on LHC experiments.We compare the obtained results with the results from other theoretical approaches

The study of b-s anomaly decays in covariant quark model

The work is devoted to the study of b-s anomaly decays. We compute the relevant form factors in the framework of the covariant quark model with infrared confinement in the full kinematical momentum transfer region. The calculated form factors are used to evaluate branching fractions and polarization observables in the $B\to K\pi+\mu^+\mu^-$ decay caused by the presence of the intermediate scalar $K^\ast_0$ and in the cascade decay $B\to \phi(\to K^+K^-)\ell^+\ell^-$. We compare the obtained results with available experimental data and the results from other theoretical approaches

Impact of scalar mesons on the rare B-decays

In the wake of exploring uncertainty in the full angular distribution of the [Formula: see text] caused by the presence of the intermediate scalar [Formula: see text] meson, we perform the straightforward calculation of the [Formula: see text] (S is a scalar meson) transition form factors in the full kinematical region within the covariant quark model. We restrict ourselves by the scalar mesons below 1 GeV: [Formula: see text]. As an application of the obtained results we calculate the widths of the semileptonic and rare decays [Formula: see text], [Formula: see text] and [Formula: see text]. We compare our results with those obtained in other approaches.</jats:p