Understanding the nature of baryon resonances
Abstract
This presentation opens with a brief review of lattice QCD calculations showing the radial excitation of the nucleon sits at approximately 2 GeV, well above the Roper resonance position. We then proceed to reconcile this observation with experimental scattering data. While the idea of dressing quark-model states in a coupled-channel analysis to describe scattering data has been around for decades, it's now possible to bring these descriptions to the finite-volume of lattice QCD for confrontation with lattice-QCD calculations. This combination of lattice QCD and experiment demands that we reconsider our preconceived notions about the quark-model and its excitation spectrum. We close with a discussion of an unanticipated resolution to the missing baryon resonances problem.
Keywords
Cite
@article{arxiv.2401.04901,
title = {Understanding the nature of baryon resonances},
author = {Derek B. Leinweber and Curtis D. Abell and Liam C. Hockley and Waseem Kamleh and Zhan-Wei Liu and Finn M. Stokes and Anthony W. Thomas and Jia-Jun Wu},
journal= {arXiv preprint arXiv:2401.04901},
year = {2024}
}
Comments
8 pages, 2 figures. To appear as a plenary contribution to the proceedings of HADRON 2023, the 20th International Conference on Hadron Spectroscopy and Structure, 5th-9th June 2023, Genova, Italy