Eta and kaon production in a chiral quark model

TL;DR

This paper develops a coupled-channel model using a chiral quark framework to analyze eta and kaon production, successfully matching experimental partial-wave data and explaining a resonance at 1685 MeV.

Contribution

It introduces a coupled-channel formalism with a quark-model basis to predict meson-baryon scattering and photo-production amplitudes, aligning with recent experimental analyses.

Findings

Predicted sizable amplitudes in key partial waves.

Achieved agreement with MAID and Bonn-Gatchina analyses.

Provided a quark-model explanation for the 1685 MeV resonance.

Abstract

We apply a coupled-channel formalism incorporating quasi-bound quark-model states to calculate pion scattering into eta N, K Lambda and K Sigma channels, as well eta p, eta n, K+Lambda, and K0Sigma+ photo-production processes. The meson-baryon and photon-baryon vertices are determined in a SU(3) version of the Cloudy Bag Model. Our model predicts sizable amplitudes in the P11, P13, P33 and S11 partial waves in agreement with the latest MAID isobar model and the recent partial-wave analyses of the Bonn-Gatchina group. We are able to give a quark-model explanation for the apparent resonance at 1685 MeV in the eta n channel.