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

Abstract

The $\Lambda (1520)$ resonance has been recently studied in a unitarized coupled channel formalism with $\pi \Sigma (1385)$, $K\Xi (1530)$, $\bar{K}N$ and $\pi \Sigma$ as constituents blocks. We provide a theoretical study of the predictions of this model in physical observables of the $pp\to p{K}^{+}{K}^{-}p$ and $pp\to p{K}^{+}{\pi }^0{\pi }^0\Lambda$ reactions. In particular, we show that the ratio between the ${\pi }^0{\pi }^0\Lambda$ and $K^{-}p$ mass distributions can provide valuable information on the ratio of the couplings of the $\Lambda (1520)$ resonance to $\pi \Sigma (1385)$ 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.

Comments: 8 pages, 4 figures. Submitted to Eur.Phys.J.A