The $Λ_{b}\rightarrow J/ψK^{0}Λ$ reaction and a hidden-charm pentaquark state with strangeness

Abstract

We study the $Λ_{b}\rightarrow J/ψK^{0}Λ$ reaction considering both the $K^{0}Λ$ 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 $J/ψ$ spectrum.

25 pages, 14 figures, include a section for the Jpsi in J=3/2 and a explicit appendix