Understanding the nature of baryon resonances
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916086760341504 |
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| author | Leinweber, Derek B. Abell, Curtis D. Hockley, Liam C. Kamleh, Waseem Liu, Zhan-Wei Stokes, Finn M. Thomas, Anthony W. Wu, Jia-Jun |
| author_facet | Leinweber, Derek B. Abell, Curtis D. Hockley, Liam C. Kamleh, Waseem Liu, Zhan-Wei Stokes, Finn M. Thomas, Anthony W. Wu, Jia-Jun |
| contents | This presentation 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'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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04901 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Understanding the nature of baryon resonances Leinweber, Derek B. Abell, Curtis D. Hockley, Liam C. Kamleh, Waseem Liu, Zhan-Wei Stokes, Finn M. Thomas, Anthony W. Wu, Jia-Jun High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory This presentation 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'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. |
| title | Understanding the nature of baryon resonances |
| topic | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2401.04901 |