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

• Received 23 October 2015

DOI:https://doi.org/10.1103/PhysRevD.92.114013