Rare Radiative Decays of Vector and Axial-Vector $B_{c}$ Mesons to $ (D_{s}, D^{*}_{s}, D_{s1}) $ Final States

TL;DR

This paper employs QCD sum rules to analyze rare radiative decays of vector and axial-vector B_c mesons into specific charmed strange mesons, estimating branching ratios that could be experimentally verified.

Contribution

It provides the first calculation of transition form factors and branching ratios for these decay channels using the QCD sum rule approach.

Findings

Branching ratios estimated between 10^{-6} and 10^{-5}.

Results are accessible for experimental verification.

First theoretical estimates for these specific decay modes.

Abstract

In this work, we use the QCD sum rule method to study the radiative decays of the vector and axial-vector $B_c$ mesons to each of three charmed strange mesons, $D_s$, $D^*_s$ and $D_{s1}$, through their dominant weak annihilation channels. We calculate all relevant transition form factors, which are used to estimate the branching fractions at different channels. The order of branching ratios are obtained to be in the order of $ 10^{-6} - 10^{-5} $, which may be checked via differnet experiments.