A chiral quark model for meson electro-production in the S11 partial wave

TL;DR

This paper develops a coupled-channel quark model to accurately describe meson electro-production in the S11 partial wave, aligning well with experimental data and clarifying the nature of the N(1535) resonance.

Contribution

It introduces a quark model approach using the Cloudy Bag Model to analyze meson electro-production, emphasizing the resonance's three-quark structure.

Findings

Good agreement with experimental partial widths and electro-production amplitudes.

Supports the N(1535) as a genuine three-quark state.

Provides a unified framework for meson scattering and electro-production.

Abstract

We calculate the meson scattering and electro-production amplitudes in the S11 partial wave in a coupled-channel approach that incorporates quasi-bound quark-model states. Using the quark wave functions and the quark-meson interaction from the Cloudy Bag Model, we obtain a good overall agreement with the available experimental results for the partial widths of the N(1535) and the N(1650) resonances as well as for the pion, eta and kaon electro-production amplitudes. Our model is consistent with the N(1535) resonance being dominantly a genuine three-quark state rather than a quasi-bound state of mesons and baryons.