Testing the nature of the $Λ(1520)$ resonance in proton-induced production

Abstract

The $Λ(1520)$ resonance has been recently studied in a unitarized coupled channel formalism with $πΣ(1385)$, $KΞ(1530)$, $\bar{K}N$ and $πΣ$ as constituents blocks. We provide a theoretical study of the predictions of this model in physical observables of the $pp\to pK^+K^-p$ and $pp\to pK^+π^0π^0Λ$ reactions. In particular, we show that the ratio between the $π^0π^0Λ$ and $K^-p$ mass distributions can provide valuable information on the ratio of the couplings of the $Λ(1520)$ resonance to $πΣ(1385)$ and $\bar{K}N$ that the theory predicts. Calculations are done for energies which are accessible in an experimental facility like COSY at Jülich or the developing CSR facility at Lanzhou.