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.
Categories: hep-ph