K. Azizi, N. Ghahramani, A. R. Olamaei
We investigate the radiative $B_{c} \to D_{s1} \gamma$ transition in the framework of QCD sum rules. In particular, using the quark condensate, mixed and two-gluon condensate diagrams as well as propagation of the soft quark in the electromagnetic field as non-perturbative effects, we calculate the transition form factors responsible for this decay in both weak annihilation and electromagnetic penguin channels. These form factors then are used to estimate the decay rates and branching ratios in these channels. The total branching ratio for this decay is evaluated to be in the order of $10^{-5}$ and the dominant mode is the weak annihilation channel.
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http://arxiv.org/abs/1207.1676
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