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

Abstract

We study the charmful decays of the two-body ${\cal B}_b\to {\cal B}_n M_c$ decays, where ${\cal B}_b$ represents the anti-triplet of $(Λ_b,Ξ_b^0,Ξ_b^-)$, ${\cal B}_n$ stands for the baryon octet and $M_c$ denotes as the charmed meson of $D^{(*)}_{(s)}$, $η_c$ and $J/ψ$. Explicitly, we predict that ${\cal B}(Λ_b\to D_s^- p)=(1.8\pm 0.3)\times 10^{-5}$, which is within the measured upper bound of ${\cal B}(Λ_b\to D_s^- p)<4.8(5.3)\times 10^{-4}$ at 90\%\,(95\%) C.L., and reproduce ${\cal B}(Λ_b\to J/ψΛ)=(3.3\pm 2.0)\times 10^{-4}$ and ${\cal B}(Ξ_b^-\to J/ψΞ^-)=(5.1\pm 3.2)\times 10^{-4}$ in agreement with the data. Moreover, we find that ${\cal B}(Λ_b \to Λη_c)=(1.5 \pm 0.9) \times 10^{-4}$, ${\cal B}(Ξ_b^-\toΞ^-η_c)=(2.4\pm1.5) \times 10^{-4}$ and ${\cal B}(Ξ_b^0\toΞ^0η_c,Ξ^0 J/ψ)=(2.3\pm1.4,4.9\pm3.0)\times 10^{-4}$, which are accessible to the experiments at the LHCb.

10 pages, 1 figure, revised version accepted by PRD