The purely leptonic and semileptonic decays of $D^{*}_{s}$ meson

TL;DR

This paper provides theoretical predictions for leptonic and semileptonic decays of the $D^{*}_{s}$ meson within the Standard Model, highlighting their potential observability in future high-luminosity experiments.

Contribution

It offers detailed calculations of decay widths, branching fractions, and asymmetries for $D^{*}_{s}$ decays, which are novel predictions for future experimental verification.

Findings

Branching fractions of order 10^{-5} for leptonic decays.

Branching fractions of order 10^{-7} for semileptonic decays.

Decays are expected to be observable in upcoming experiments.

Abstract

With the potential prospects of the $D^{*}_{s}$ at high-luminosity heavy-flavor experiments in the future, we investigated the CKM-favored and tree-dominated leptonic $D^{*}_{s}\to\ell\bar{\nu}_{\ell}$ and semileptonic $D^{*}_{s}\to M\ell\bar{\nu}_{\ell}$ ($M=\phi, \eta^{(\prime)}$ and $\ell=e, \mu$) weak decays in the Standard Model (SM). The theoretical predictions and some discussions for the observable quantities including the total width of $D^{*}_{s}$ mesons, the branching fractions of leptonic $D^{*}_{s}\to\ell\bar{\nu}_{\ell}$ and semileptonic $D^{*}_{s}\to M\ell\bar{\nu}_{\ell}$ weak decays, the lepton spin asymmetry and forward-backward asymmetry are presented. Numerically, the weak decays of $D^{*}_{s}\to\ell\bar{\nu}_{\ell}$ and $D^{*}_{s} \to M\ell\bar{\nu}_{\ell}$ have relatively large branching fractions of the order $\mathcal{O}(10^{-5})$ and $\mathcal{O}(10^{-7})$ respectively, which are expected to be observed in future experiments.