Level Order of Quark Systems: The Puzzle of the Roper Resonance, and Related Questions
Abstract
The problem of ordering of radial versus orbital excitations is reviewed. It is shown that the current quark models cannot explain the location of the Roper resonance which is slightly lower than the lowest negative-parity excitations. We also study some related spectral problems, such as the dependence of the energies on the quark masses, and the possibility of bound states in simple chromelectric models. Abstract Published by the Jagiellonian University 2026 authors
Fields of Study & Subjects
Quantum Chromodynamics and Particle Interactions
Particle physics theoretical and experimental studies
Nuclear physics research studies
Publication details
- Journal / source
- Acta Physica Polonica B
- Volume
- 57
- Issue
- 2
- Pages
- 1–1
- Publication date
- 10 February 2026
- Language
- EN