The \(\Lambda _{b} \to J/\psi K^{0}\Lambda \) and \(\Lambda _{b}\) into \(J/\psi \eta \Lambda \) Reactions and a Hidden-Charm Pentaquark State with Strangeness

We present a brief review on predictions for hidden charm molecules, with and without strangeness, which were made prior to the LHCb experiment. We discuss these issues and how these states can be observed in the reactions, \(\Lambda _{b} \to J/\psi K^{ - }p\), \(\Lambda _{b} \to J/\psi \eta \Lambda \), \(\Lambda _{b} \to J/\psi \pi ^{ - }p\), \(\Lambda _{b} \to J/\psi K^{0}\Lambda \), and \(\Xi _{b}^{ - } \to J/\psi K^{ - }\Lambda \) by looking at the invariant mass distributions for \(J/\psi p\) or \(J/\psi \Lambda \).