Anticharmed strange pentaquarks from the one-boson-exchange model

Inspired by the LHCb’s discovery of hidden-charm pentaquarks, the anticharmed strange pentaquarks $P_{\bar{c}s}$ in a favor of the hadronic molecule picture are investigated from the one-boson-exchange model. Similar to the hidden-charm pentaquarks, three molecular bound states, one with spin parity $J^P=1\mathrm{/}{2}^{-}$ below the $\bar{D}\mathrm{\Sigma }$ threshold and another two with $J^P=\{1\mathrm{/}{2}^{-},3\mathrm{/}{2}^{-}\}$ below the ${\bar{D}}^{\ast }\mathrm{\Sigma }$ threshold, are predicted at $3-3.2$ GeV mass region. The mass ordering of the later two states can be interchanged by different reductions of the $\delta (r)$ term. Furthermore, resonances associated with these three bound states are examined by considering $ D_s^-N-\bar D\Lambda-\bar D \Sigma-\bar D^\Lambda-\bar D^\Sigma$ coupled-channel dynamics, and decay widths of them are predicted. Our study indicates that the $D_s^{-}p$ invariant mass spectrum in the ${\bar{B}}_s^0\to \bar{n}{D}_s^{-}p$ decay is an appropriate place to detect the $P_{\bar{c}s}$ pentaquarks.