# Hyperon II: Properties of excited hyperons

## TL;DR

This paper investigates the properties of excited hyperons, especially $ ext{Λ}$ and $ ext{Σ}$ resonances, through $K^-$ induced reactions, providing new resonance data, pole positions, and comparisons with quark model predictions.

## Contribution

It reports the discovery of five new hyperon resonances and provides detailed resonance parameters, including pole positions, masses, widths, and decay modes, not previously established.

## Key findings

- Identified five new hyperon resonances.
- Provided pole positions and decay properties for multiple hyperons.
- Compared experimental spectrum with Bonn quark model predictions.

## Abstract

We report properties of $\Lambda$ and $\Sigma$ hyperon resonances formed in $K^-$ induced reactions. Special emphasis is laid on the analysis of the three-body final states $2\pi^0\Lambda$ and $2\pi^0\Sigma$ and of the quasi-two-body final states $\pi\Lambda(1520)$, $\bar K\Delta(1232)$, $\pi\Sigma(1385)$, $\bar K^*N$, and $\omega\Lambda$. We give pole positions of $\Lambda$ and $\Sigma$ hyperon resonances and transition residues from the $K^-p$ initial to various final states as well as Breit-Wigner masses and widths and decay branching ratios. Twenty resonances and "bumps" reported in the Review of Particle Physics are not required in our fits, evidence for five new resonances is reported. The observed mass spectrum is compared to the spectrum calculated in the Bonn quark model. Three spin doublets, six $\Lambda$ hyperons, are tentatively assigned to the SU(3) singlet system.