Study of charmless two-body baryonic $B$ decays

Abstract

We study the charmless two-body decays of $B\to {\mathbf{B}}_n{\overline{\mathbf{B}}}_n^{\prime }$ with $B=(B^{+},B^0,B_s^0)$ and ${\mathbf{B}}_n^{(\prime )}$ the low-lying octet baryons. The factorizable amplitudes are calculated by the modified bag model, while the nonfactorizable ones are extracted from the experimental data with the $SU(3{)}_F$ flavor symmetry. We are able to explain all current experimental measurements and provide predictions on the decay branching ratios in $B\to {\mathbf{B}}_n{\overline{\mathbf{B}}}_n^{\prime }$. Particularly, we find that $\mathcal{B}(B_s^0\to {\Xi }^0{\overline{\Xi }}^0)=(19.3\pm 2.7)\times 10^{-7}$ and $\mathcal{B}(B_s^0\to {\Xi }^{-}{\overline{\Xi }}^{-})=(19.4\pm 2.7)\times 10^{-7}$, which are sizable and able to be observed in the ongoing experiments at LHCb and BELLE-II. Furthermore, the decay branching ratios of $B_s^0\to (p\overline{p},n\overline{n})$ and $B^0\to ({\Xi }^0{\overline{\Xi }}^0,{\Sigma }^{+}{\overline{\Sigma }}^{+})$ are expected to be $O(10^{-10})$, which are suppressed due to the angular momentum conservation and chiral symmetry.

arXiv comment15 pages, 2 figures, published version

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• Center of mass motion in bag model
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