Semileptonic and nonleptonic decays of $B_{u,d,s,c}^{*}$ in the covariant light-front approach

TL;DR

This paper investigates semileptonic and nonleptonic decays of b-flavor vector mesons using the covariant light-front quark model, predicting decay rates and asymmetries relevant for future collider experiments.

Contribution

It provides the first comprehensive calculation of form factors and decay observables for $B^{*}$ mesons within the covariant light-front approach, including predictions for branching ratios and polarization fractions.

Findings

Largest branching ratios are for specific semileptonic and nonleptonic decays, reaching up to 10^{-7}.

Predicted decay channels are accessible at future high-luminosity experiments.

Form factors and physical observables are systematically calculated within the CLFQM.

Abstract

The semileptonic and nonleptonic decays of the b-flavor vector mesons $B^{*}_{u,d,s}$ and $B_{c}^{*}$ are investigated within the covariant light-front quark model (CLFQM). By calculating the form factors of the transitions $B_{u, d, s, c}^{*}\to P$ under the CLFQM, with $P$ denoting a pseudoscalar meson, i.e., $\pi, K, \eta_c(1S,2S), D_{(s)}, B_{(s)}$, we predict and discuss several physical observables, including the branching ratios, polarization fractions $f_{L}, f_{\|}$, and forward-backward asymmetries $A_{FB}$. The total widths of the single-photon radiative decay channels for these b-flavor vector mesons are estimated using their partial widths. In these considered decays, one can find that the semileptonic decays $B_{s}^{*0}\to D_{s}^{-}\ell^{\prime+}{\nu}_{\ell^\prime}$ and $B_{c}^{*+}\to B_{s}^{0}\ell^{\prime+}{\nu}_{\ell^\prime}, \eta_{c}\ell^{\prime+}{\nu}_{\ell^\prime}$, with $\ell^\prime$ being $e$ or $\tau$, and the nonleptonic channels $B_{c}^{*+}\to B^0_{s} \pi^{+}, B^0_{s} \rho^{+}$ have the largest branching ratios, which can reach up to the $10^{-7}$ order, and are most likely to be accessible at the future high-luminosity LHCb and Belle-II experiments.