The radiative decays $B_c^{\ast \pm }\to B_c^{\pm }\gamma$ with QCD sum rules

Abstract

In this article, we calculate the $B_c^{\ast }\to B_c$ electromagnetic form-factor with the three-point QCD sum rules, then study the radiative decays $B_c^{\ast \pm }\to B_c^{\pm }\gamma$. Experimentally, we can study the radiative transitions using the decay cascades $B_c^{\ast \pm }\to B_c^{\pm }\gamma \to J/\psi {\ell }^{\pm }{\bar{\nu }}_{\ell }\gamma \to {\mu }^{+}{\mu }^{-}{\ell }^{\pm }{\bar{\nu }}_{\ell }\gamma$ in the future at the LHCb.

Comments: 12 pages, 9 figures. arXiv admin note: text overlap with arXiv:1307.2422