$B_s$ Semileptonic Decays to $D_s$ and $D_s^*$ in Bethe-Salpeter Method

TL;DR

This paper calculates the electron energy spectrum and decay widths of specific $B_s$ semileptonic decays using the relativistic Bethe-Salpeter method, predicting large branching ratios for future experimental detection.

Contribution

It applies the relativistic Bethe-Salpeter approach to compute semileptonic decay properties of $B_s$ mesons, providing new theoretical predictions.

Findings

Large predicted branching ratios for $B_s$ decays to $D_s$ and $D_s^*$

Calculated decay widths and electron energy spectra

Predictions are testable in future experiments

Abstract

Using the relativistic Bethe-Salpeter method, the electron energy spectrum and the semileptonic decay widths of $B^0_s\to D^-_s \ell^+{\nu_\ell}$ and $B^0_s\to D_s^{*-}\ell^+{\nu_\ell}$ are calculated. We obtained large branching ratios, $Br(B_s\to D_se\nu_e)=(2.85\pm0.35)% $ and $Br (B_s\to D_s^*e\nu_e)=(7.09\pm0.88)%$, which can be easily detected in the future experiment.