Testing the nature of the Λ(1520) in the J/ψ → $$ \bar \Lambda $$ K-p and J/ψ → $$ \bar \Lambda $$ π+π-Λ reactions

Abstract

We study the reactions J/ψ → \( \bar \Lambda \) K - p and J/ψ → \( \bar \Lambda \)π+π-Λ with a unitary chiral approach. We predict the ratio of the invariant-mass distributions of these two reactions at the Λ(1520) peak position, which is free of the unknown production mechanism and reflects only the properties of the Λ(1520) . An experimental measurement of this ratio will provide the couplings of the Λ(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.