$\eta$ and $\eta'$ photoproduction with EtaMAID including Regge phenomenology

TL;DR

This paper introduces an improved EtaMAID model for eta and eta' photoproduction that incorporates Regge phenomenology and resonance parameters fitted to experimental data, enhancing understanding of nucleon resonance contributions.

Contribution

The paper develops a new EtaMAID model including Regge phenomenology and resonance fitting, providing a more comprehensive description of eta and eta' photoproduction processes.

Findings

Resonance parameters fitted to experimental data.

Inclusion of Regge cut phenomenology improves background modeling.

Enhanced understanding of nucleon resonance contributions.

Abstract

We present a new version of the EtaMAID model for $\eta$ and $\eta'$ photoproduction on nucleons. The model includes 23 nucleon resonances parameterized with Breit-Wigner shapes. The background is described by vector and axial-vector meson exchanges in the $t$ channel using the Regge cut phenomenology. Parameters of the resonances were obtained from a fit to available experimental data for $\eta$ and $\eta'$ photoproduction on protons and neutrons. The nature of the most interesting observations in the data is discussed.