Charmful two-body anti-triplet $b$-baryon decays

Abstract

We study the charmful decays of the two-body ${\mathcal{B}}_b\to {\mathcal{B}}_n{M}_c$ decays, where ${\mathcal{B}}_b$ represents the anti-triplet of $({\Lambda }_b,{\Xi }_b^0,{\Xi }_b^{-})$, ${\mathcal{B}}_n$ stands for the baryon octet and $M_c$ denotes as the charmed meson of $D_{(s)}^{(\ast )}$, ${\eta }_c$ and $J/\psi$. Explicitly, we predict that $\mathcal{B}({\Lambda }_b\to D_s^{-}p)=(1.8\pm 0.3)\times 10^{-5}$, which is within the measured upper bound of $\mathcal{B}({\Lambda }_b\to D_s^{-}p)<4.8(5.3)\times 10^{-4}$ at 90\%\,(95\%) C.L., and reproduce $\mathcal{B}({\Lambda }_b\to J/\psi \Lambda )=(3.3\pm 2.0)\times 10^{-4}$ and $\mathcal{B}({\Xi }_b^{-}\to J/\psi {\Xi }^{-})=(5.1\pm 3.2)\times 10^{-4}$ in agreement with the data. Moreover, we find that $\mathcal{B}({\Lambda }_b\to \Lambda {\eta }_c)=(1.5\pm 0.9)\times 10^{-4}$, $\mathcal{B}({\Xi }_b^{-}\to {\Xi }^{-}{\eta }_c)=(2.4\pm 1.5)\times 10^{-4}$ and $\mathcal{B}({\Xi }_b^0\to {\Xi }^0{\eta }_c,{\Xi }^{0}J/\psi )=(2.3\pm 1.4,4.9\pm 3.0)\times 10^{-4}$, which are accessible to the experiments at the LHCb.

Comments: 10 pages, 1 figure, revised version accepted by PRD