The radiative decays $B_c^{*\pm} \to B_c^{\pm} γ$ with QCD sum rules

In this article, we calculate the $B_c^* \to B_c$ electromagnetic form-factor with the three-point QCD sum rules, then study the radiative decays $B_c^{*\pm} \to B_c^{\pm} γ$. Experimentally, we can study the radiative transitions using the decay cascades $B_c^{*\pm}\to B_c^{\pm} γ\to J/ψ\ell^{\pm}\barν_{\ell} γ\to μ^+ μ^- \ell^{\pm}\barν_{\ell} γ$ in the future at the LHCb.

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