Looking for a hidden-charm pentaquark state with strangeness S=−1 from Ξb− decay into J/ψK−Λ

Assuming that the recently observed hidden-charm pentaquark state, ${P}_{c}(4450)$, is of molecular nature as predicted in the unitary approach, we propose to study the decay of ${\mathrm{\ensuremath{\Xi}}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}$ to search for the strangeness counterpart of the ${P}_{c}(4450)$. There are three ingredients in the decay mechanism: the weak decay mechanism, the hadronization mechanism, and the final state interactions in the meson-baryon system of strangeness $S=\ensuremath{-}2$ and isospin $I=1/2$ and of the $J/\ensuremath{\psi}\mathrm{\ensuremath{\Lambda}}$. All these have been tested extensively. As a result, we provide a genuine prediction of the invariant mass distributions where a strangeness hidden-charm pentaquark state, the counterpart of the ${P}_{c}(4450)$, can be clearly seen. The decay rate is estimated to be of similar magnitude as the ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{\ensuremath{-}}p$ measured by the LHCb Collaboration.