# Hyperon I: Partial wave amplitudes for $K^-p$ scattering

## TL;DR

This paper performs a coupled-channel partial wave analysis of $K^-$ proton scattering data, identifying new hyperon resonances and challenging some previously listed states, thereby advancing understanding of hyperon spectroscopy.

## Contribution

It introduces a systematic search for new hyperon resonances in $K^-p$ scattering and evaluates the significance of known and new states, proposing five new hyperons.

## Key findings

- Identified five new hyperon resonances.
- Questioned the existence of 17 previously listed resonances.
- Compared partial-wave amplitudes with other analyses.

## Abstract

Early data on $K^-$ induced reactions off protons are collected and used in a coupled-channel partial wave analysis (PWA). Data which had been published in the form of Legendre coefficients are included in the PWA. In a {\it primary} fit using 3* and 4* resonances only, we observe some significant discrepancies with the data. In a systematic search for new $\Lambda$ and $\Sigma$ hyperon resonances, additional candidates are found. The significance of the known and of the additional resonances is evaluated. Seventeen resonances listed with 1* or 2* and one resonance listed with 3* in the Review of Particle Properties cannot be confirmed, five new hyperons are suggested. The partial-wave amplitudes deduced in this analysis are compared to those from other analyses.