Semileptonic $B_{s} \rightarrow D_{s2}^{*}(2573)\ell\bar{\nu}_{\ell}$ transition in QCD

TL;DR

This paper uses QCD sum rules to analyze the semileptonic B_s to D_{s2}^*(2573) transition, calculating form factors, decay widths, and branching ratios, suggesting it can be observed at LHCb soon.

Contribution

It provides the first QCD sum rule calculation of form factors for this specific transition, estimating decay properties across different lepton channels.

Findings

Branching ratios suggest detectability at LHCb.

Form factors fitted for decay width calculations.

Transition is accessible in near-future experiments.

Abstract

We analyze the semileptonic $ B_{s} \rightarrow D_{s2}^{*}(2573)\ell\bar{\nu }_{\ell}$ transition, where $\ell=\tau,~\mu$ or $e$, within the standard model. We apply the QCD sum rule approach to calculate the transition form factors entering the low energy Hamiltonian defining this channel. The fit functions of the form factors are used to estimate the total decay widths and branching fractions in all lepton channels. The orders of branching ratios indicate that this transition is accessible at LHCb in near future.