\({{B}_{s}} \to D_{s}^{{(*)}}\ell {{\nu }_{\ell }}\) and \({{B}_{c}} \to {{M}_{{\bar {c}c}}}{\kern 1pt} l{{\nu }_{\ell }}\) Decays in Covariant Confined Quark Model

期刊论文
发表日期：

2025年2月1日

查看全文

A. Issadykov,
M. Ilyassov

摘要

Abstract

In this paper we showed the theoretical predictions within the covariant quark model of branching ratios \({{B}_{s}} \to D_{s}^{{(*)}}\ell {{\nu }_{\ell }}\) and \({{B}_{c}} \to {{M}_{{\bar {c}c}}}{\kern 1pt} l{{\nu }_{\ell }}\) decays. Our results for \({{B}_{s}} \to D_{s}^{{(*)}}\ell {{\nu }_{\ell }}\) are in a good agreement with the data from the latest LHCb experiments as well as lattice quantum chromodynamics simulations. At the same time the theoretical predictions for the ratio \({{\mathcal{R}}_{{J/\psi }}}\) are more than 2σ less than the experimental data. This may indicate on the possibility of New physics effects in this decay.