Multichannel parametrization of \pi N scattering amplitudes and extraction of resonance parameters

TL;DR

This paper introduces a multichannel partial-wave analysis of c0 N scattering data, explicitly including beta N, K b4, and photoproduction channels, to extract resonance parameters consistent with S-matrix unitarity.

Contribution

It presents a novel multichannel parametrization method for c0 N scattering amplitudes that incorporates multiple channels and ensures unitarity, improving resonance parameter extraction.

Findings

Resonance parameters are extracted with improved accuracy.

Comparison with quark model predictions shows good agreement.

The analysis covers energies from 1080 to 2100 MeV.

Abstract

We present results of a new multichannel partial-wave analysis for \pi N scattering in the c.m. energy range 1080 to 2100 MeV. This work explicitly includes \eta N and K \Lambda channels and the single pion photoproduction channel. 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 so obtained are compared to predictions of quark models.