Abstract

The transition form factors of ${B}_{(s)}\ensuremath{\rightarrow}S$, with $S$ denoting a scalar meson, are investigated in the light-cone sum rules approach. The numerical values are approximately twice the number estimated in the light-front quark model and QCD sum rules approach. Using these form factors, we present the analysis of the decay rates for $B\ensuremath{\rightarrow}{a}_{0}(1450)l{\overline{\ensuremath{\nu}}}_{l}$, $B\ensuremath{\rightarrow}{K}_{0}^{*}(1430)l\overline{l}$, ${B}_{s}\ensuremath{\rightarrow}{K}_{0}^{*}(1430)l{\overline{\ensuremath{\nu}}}_{l}$, and ${B}_{s}\ensuremath{\rightarrow}{f}_{0}(1500)l\overline{l}$ with $l=e$, $\ensuremath{\mu}$, $\ensuremath{\tau}$. The results indicate that magnitudes of $BR({\overline{B}}_{0}\ensuremath{\rightarrow}{a}_{0}(1450)l{\overline{\ensuremath{\nu}}}_{l})$ and $BR({B}_{s}\ensuremath{\rightarrow}{K}_{0}^{*}(1430)l{\overline{\ensuremath{\nu}}}_{l})$ arrive at the order of ${10}^{\ensuremath{-}4}$, which can be measured in future experiments to clarify the inner structure of scalar mesons. It is also observed that $BR(B\ensuremath{\rightarrow}{K}_{0}^{*}(1430){\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}})$ and $BR({B}_{s}\ensuremath{\rightarrow}{f}_{0}(1500){\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}})$ are an order of magnitude smaller than the corresponding channels of ${e}^{+}{e}^{\ensuremath{-}}$ and ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ final states due to the heavily suppressed phase space. Moreover, the longitudinal lepton polarization asymmetry for $B\ensuremath{\rightarrow}{K}_{0}^{*}(1430)l\overline{l}$ and ${B}_{s}\ensuremath{\rightarrow}{f}_{0}(1500)l\overline{l}$ are also investigated, whose values are close to $\ensuremath{-}1$ for the ${e}^{+}{e}^{\ensuremath{-}}$ and ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ pair except for the region close to the endpoints.

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