Formation of $\Sigma \pi$ pairs in nuclear captures of K$^-$ mesons

TL;DR

This paper investigates the formation of Sigma-pi pairs in nuclear captures of K- mesons, providing insights into hyperon-pion interactions and the structure of the Lambda(1405) resonance within nuclear media.

Contribution

It offers new experimental data and theoretical calculations on Sigma-pi pair formation, enhancing understanding of hyperon resonances in nuclear environments.

Findings

Detection of Sigma-pi pairs below KbarN threshold

Insights into Lambda(1405) structure in nuclear media

Comparison with electro-production data

Abstract

The capture of K$^-$ mesons on nucleons bound in nuclei offer a chance to study the $\Sigma \pi$ pairs below the kinematic threshold of the $\bar{\mathrm{K}}$N systems. Various hyperon-pion charged combination are presently under investigation by AMADEUS. These data allow to test both isospin 0 and 1 amplitudes giving the possibility to detect the structure of resonant $\Lambda$(1405) state. Contrasted against similar electro-production data, it is possible to detect changes of $\Lambda$(1405) in nuclear media. Expected spectra and their uncertainties are calculated.