Understanding the nature of baryon resonances
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Date
2024
Authors
Leinweber, D.B.
Abell, C.D.
Hockley, L.C.
Kamleh, W.
Liu, Z.-W.
Stokes, F.
Thomas, A.W.
Wu, J.-J.
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Il Nuovo Cimento C - Colloquia on Physics, 2024; 47(4):146-1-146-8
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Derek B. Leinweber, Curtis D. Abell, Liam C. Hockley, Waseem Kamleh, Zhan-Wei Liu, Finn M. Stokes, Anthony W. Thomas and Jia-Jun Wu
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Abstract
This paper opens with a brief review of lattice QCD calculations showing the 2s 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 is 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.
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Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0)