Where is the next pentaquark state?

Abstract

The LHCb Collaboration has observed two types of hidden-charm pentaquark states $P_{\psi}^N$ and $P_{\psi s}^{\Lambda}$ since 2015. In this work, we predict two other types of hidden-charm pentaquark states $P_{\psi s}^{\Sigma}(4367)$ and $P_{\psi ss}^{N}(4379)$ within the framework of heavy pentaquark chiral perturbation theory. We suggest the LHCb Collaboration to observe $P_{\psi ss}^{N}(4379)^{-}$ and $P_{\psi ss}^{N}(4379)^0$ with $J^P=\frac{1}{2}^{-}$ in the $J/\psi \Xi$ spectrum through amplitude analyses of $\Omega_b^- \to J/\psi \Xi^0 K^-$ decays and $B^- \to J/\psi \Xi^- \bar{\Lambda}$ decays.