Gluons in the $\eta'$ and in nucleon resonances

TL;DR

This paper explores the influence of gluon dynamics on eta' meson physics and nucleon resonances, suggesting gluonic excitations could explain phenomena like near-threshold resonances and parity doublets in nucleon spectra.

Contribution

It introduces the idea that gluonic potentials and excitations play a significant role in eta' and nucleon resonance phenomena, proposing new interpretations of observed spectral features.

Findings

Potential narrow resonance in eta' photoproduction near threshold

Parity doublets may indicate a second minimum in the confinement potential

Gluonic excitations could be key to understanding nucleon resonance structure

Abstract

We discuss the role of gluon dynamics in $\eta'$ physics and in nucleon resonances where excitations of gluonic potentials may also be important. Interesting phenomenology includes a possible narrow near threshold resonance in $\eta'$ photoproduction and whether the parity doublets observed in the higher mass nucleon resonance spectrum might be hinting at a possible second minimum in the confinement potential corresponding to supercritical confinement.