Multichannel parametrization of $\bar K N$ scattering amplitudes and extraction of resonance parameters

TL;DR

This paper introduces a multichannel partial-wave analysis of antikaon-nucleon scattering data, extracting resonance parameters in a way consistent with unitarity, and compares results with quark model predictions.

Contribution

It presents a novel multichannel parametrization method for $ar K N$ scattering amplitudes that ensures unitarity and provides resonance parameters aligned with theoretical models.

Findings

Resonance parameters agree with quark model predictions

The analysis covers energies from 1480 to 2100 MeV

A consistent multichannel approach improves resonance extraction

Abstract

We present results of a new multichannel partial-wave analysis for $\bar K N$ scattering in the c.m.\ energy range 1480 to 2100 MeV. Resonance parameters were extracted by fitting partial-wave amplitudes from all considered channels using a multichannel parametrization that is consistent with $S$-matrix unitarity. The resonance parameters are generally in good agreement with predictions of the Koniuk-Isgur quark model.