A study on the rare radiative decay $B_c \to D_s^* γ$

Details A study on the rare radiative decay $B_c \to D_s^* γ$ A study on the rare radiative decay $B_c \to D_s^* γ$

1996-03-13

arxiv.org/abs/hep-ph/9603291v1

Phys.Lett. B380 (1996) 193-198

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, in LaTeX, to be appear in Phys. Lett. B

Scientific paper

10.1016/0370-2693(96)00483-2

We study the decay $B_c \rightarrow D_s^* \gamma$. There are two mechanisms contributing to the process. One proceeds through the short distance $b{\rightarrow}s\gamma$ transition and the other occurs through weak annihilation accompanied by a photon emission.The electromagnetic penguin contribution is estimated by perturbative QCD and found to be $4.68\times10^{-18}$ GeV. In particular, we find the contribution of the weak annihilation is $6.25\times10^{-18}GeV$ which is in the same order as that of the electromagnetic penguin. The total decay rate $\Gamma(B_c \rightarrow D_s^* \gamma)$ is predicted to be $1.45\times10^{-17}GeV$ and the branching ratio $Br(B_c \rightarrow D_s^* \gamma)$ is predicted to be $2.98\times 10^{-5}$ for $\tau_{B_c}=1.35ps$. The the decays $B_c \rightarrow D_s^* \gamma$ can be well studied at LHC in the near future.

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