Testing the nature of the $Λ$(1520) in the $J/ψ\to\barΛK^-p$ and $J/ψ\to\barΛπ^+π^-Λ$ reactions

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211420We study the reactions $J/ψ\to\barΛK^-p$ and $J/ψ\to\barΛπ^+π^-Λ$ 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.7 pages, 6 figures, version to appear in EPJAHigh Energy Physics - PhenomenologyTesting the nature of the $Λ$(1520) in the $J/ψ\to\barΛK^-p$ and $J/ψ\to\barΛπ^+π^-Λ$ reactionstext