Radiative Baryonic $B$ Decays

Abstract

We study the structure-dependent contributions to the radiative baryonic $B$ decays of $B\to \mathbf{B}{\bar{\mathbf{B}}}^{\prime }\gamma$ in the standard model. We show that the decay branching ratios of $Br(B\to \mathbf{B}{\bar{\mathbf{B}}}^{\prime }\gamma )$ are $O(10^{-7})$, which are larger than the estimated values of $O(10^{-9})$ induced from inner bremsstrahlung effects of the corresponding two-body modes. In particular, we find that $Br(B^{-}\to \Lambda \bar{p}\gamma )$ is around $1\times 10^{-6}$, which is close to the pole model estimation but smaller than the experimental measurement from BELLE.

Comments: 11 pages, 2 figures, Revtex4, new fitting is included