The $\Lambda_{b}\rightarrow J/\psi K^{0}\Lambda$ reaction and a hidden-charm pentaquark state with strangeness

TL;DR

This paper investigates the $ ightarrow J/c K^{0} reaction, predicting a hidden-charm pentaquark with strangeness that manifests as a peak or dip in the $J/c\u001b ext{Lambda}$ invariant mass distribution, indicating a potential new exotic state.

Contribution

It introduces a theoretical prediction of a hidden-charm pentaquark with strangeness and analyzes its observable effects in a specific decay reaction.

Findings

A clear peak in the $J/c ext{Lambda}$ invariant mass distribution suggests a detectable pentaquark state.

The predicted state produces a stable signal under various model assumptions.

A dip structure may appear, but the state’s signature is observable in the $J/c$ spectrum.

Abstract

We study the $\Lambda_{b}\rightarrow J/\psi K^{0}\Lambda$ reaction considering both the $K^{0}\Lambda$ interaction with its coupled channels and the $J/\psi\Lambda$ 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 $J/\psi\Lambda$. By using the coupling of the resonance to $J/\psi\Lambda$ from these predictions we show that a neat peak can be observed in the $J/\psi\Lambda$ 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 $J/\psi$ spectrum.