Chiral quark model approach for the study of baryon resonances

TL;DR

This paper applies the chiral quark model to study baryon resonances in meson photoproduction and scattering, successfully explaining cross sections near threshold and the dominance of S-wave processes.

Contribution

It introduces a chiral quark model approach to baryon resonances, providing insights into resonance couplings and cross sections with minimal parameters.

Findings

Cross sections near threshold are well described by the model.

S-wave dominance in specific reactions is explained.

The model constrains resonance coupling signs consistent with other models.

Abstract

We report the chiral quark model approach for the study of baryon resonances in meson photoproduction and meson-nucleon scattering processes. Focussing on the $\pi N$ and $K N$ scatterings, we show that the cross sections near threshold can be well accounted for by the chiral quark model with only few parameters. The $S$-wave dominance in both $\pi^- p\to \eta n$ and $K^- p\to \Sigma^0\pi^0$ can be well understood in the quark model framework. In particular, the quark model provides a constraint on the relative signs for resonance coupling form factors, which seems to be consistent with results from isobaric models.