arXiv subjects

Sayabek K. Sakhiyev

Publications and source records attributed to Sayabek K. Sakhiyev.

3 recordsLinked to original sources

arXiv2023

$B^{*}_c$ meson parameters and radiative decay width within the covariant confined quark model

In this work we tried to predict the parameters of $B^{*}_c$ meson. Simple assumptions gave us following parametres $m_{B_{c}^{*}}=6329\pm 10$ MeV and $f_{B_{c}^{*}}= 535.5\pm57.8$ MeV (for $Λ_{B_{c}^{*}}=2.26\pm 0.14$ GeV in covariant confined quark model). We calculated widths of radiative decays of $B^*_{q}$ mesons, where $q=u/d,s,c$ and compared them with other theoretical works. It was shown that the width of the $B_{c}^{*}$ meson very sensitive to the mass $m_{B_{c}^{*}}$ as expected and less to the size parameter $Λ_{B_{c}^{*}}$.

hep-ph↗

arXiv2016

Decay $B_s\to ϕ\ell^+ \ell^-$ in covariant quark model

Our article is devoted to the study of the rare $B_s\to ϕ\ell^+\ell^-$ decay where $\ell=μ,τ$. 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 cascade decay $B\to ϕ(\to K^+K^-)\ell^+\ell^-$. We compare the obtained results with available experimental data and the results from other theoretical approaches.

hep-ph↗

arXiv2015

Form factors of the B-S-transitions in the covariant quark model

In the wake of exploring uncertainty in the full angular distribution of the $B\to Kπ+μ^+μ^-$ caused by the presence of the intermediate scalar $K^\ast_0$ meson, we perform the straightforward calculation of the $B(B_s)\to S$ (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: $a_0(980), f_0(500), f_0(980), K^\ast_0(800)$. As an application of the obtained results we calculate the widths of the semileptonic and rare decays $B(B_s)\to S\ell\barν$, $B(B_s)\to S\ell\bar\ell$ and $B(B_s)\to Sν\barν$. We compare our results with those obtained in other approaches.

hep-ph↗