Investigating $Z_{cs}(3985)$ and $Z_{cs}(4000)$ exotic states in ${\mathrm{\Lambda }}_b\to Z_{cs}^{-}p$ decays

We study the $Z_{cs}(3985)$ and $Z_{cs}(4000)$ exotic states in the decays of ${\mathrm{\Lambda }}_b$ baryons through a molecular scenario. In the final state interaction, the ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_c^{+}{D}_s^{(\ast )-}$ decays are followed by the ${\mathrm{\Lambda }}_c^{+}{D}_s^{(\ast )-}$ to $Z_{cs}^{-}p$ rescatterings via exchange of a $D^{(\ast )}$ meson. We predict a branching fraction of $(3.1_{-2.6}^{+1.4})\times {10}^{-4}$ for ${\mathrm{\Lambda }}_b\to Z_{cs}^{-}p$, which can be measured in the ${\mathrm{\Lambda }}_b\to J\mathrm{/}\psi K^{(\ast )-}p$ decay. This study proposes a new approach to test the molecular model, and guides future experimental searches for the $Z_{cs}(3985)$ and $Z_{cs}(4000)$.