Chiral constituent quark model study of the process $\gamma p \to \eta p$

TL;DR

This paper develops a chiral constituent quark model to analyze the gamma-proton to eta-proton reaction, incorporating various nucleon resonances to fit differential cross sections and polarization data.

Contribution

It introduces a comprehensive quark model including all PDG-listed resonances and explores potential contributions from missing resonances in eta photoproduction.

Findings

Successful fit to differential cross sections and polarization asymmetries.

Identification of possible roles of missing resonances.

Insights into resonance contributions to eta photoproduction.

Abstract

A constituent quark model is developed for the reaction, allowing us to investigate all available data for differential cross sections as well as single polarization asymmetries (beam and target) by including {\it all} of the PDG, one to four star, nucleon resonances ($S_{11}$, $P_{11}$, $P_{13}$, $D_{13}$, $D_{15}$, $F_{15}$, $F_{17}$, $G_{17}$, $G_{19}$, $H_{19}$, $I_{1,11}$, and $K_{1,13}$). Issues related to the missing resonances are also briefly discussed by examining possible contributions from several new resonances ($S_{11}$, $P_{11}$, $P_{13}$, $D_{13}$, $ D_{15}$, and $H_{1,11}$).