Gluons in the ${\eta }^{\prime }$ and in nucleon resonances

Abstract

We discuss the role of gluon dynamics in ${\eta }^{\prime }$ physics and in nucleon resonances where excitations of gluonic potentials may also be important. Interesting phenomenology includes a possible narrow near threshold resonance in ${\eta }^{\prime }$ 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.

10 pages, Presented at the Workshop at 1 GeV scale: from mesons to axions, Krakow, September 19-20 2024