Λb →j /ψK0 Λ reaction and a hidden-charm pentaquark state with strangeness

We study the Λb→J/ψK0Λ reaction considering both the K0Λ interaction with its coupled channels and the J/ψΛ interaction. The latter is described by taking into account the fact that there are predictions for a hidden-charm state with strangeness that couples to J/ψΛ. By using the coupling of the resonance to J/ψΛ from these predictions, we show that a neat peak can be observed in the J/ψΛ invariant mass distribution, rather stable under changes of unknown magnitudes. In some cases, one finds a dip structure associated to that state, but a signal of the state shows up in the J/ψΛ spectrum.