Testing the nature of the Λ(1520) in the J/psitobar{Λ}K^-p and J/psitobar{Λ}π^+π^-Λ reactions

We study the reactions $J/\psi\to\bar{\Lambda}K^-p$ and $J/\psi\to\bar{\Lambda}\pi^+\pi^-\Lambda$ with a unitary chiral approach. We predict the ratio of the invariant mass distributions of these two reactions at the $\Lambda(1520)$ peak position, which is free of the unknown production mechanism and reflects only the properties of the $\Lambda(1520)$. An experimental measurement of this ratio will provide the couplings of the $\Lambda(1520)$ to its decay channels, allowing to test the predictions of the chiral unitary approach on this resonance, which appears as dynamically generated in that approach.