The impact of [formula omitted] and [formula omitted] interactions on our understanding of nucleon excitations.
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| Title: | The impact of [formula omitted] and [formula omitted] interactions on our understanding of nucleon excitations. |
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| Authors: | Burkert, Volker1 (AUTHOR) Bukert@jlab.org, Eichmann, Gernot2 (AUTHOR) gernot.eichmann@uni-graz.at, Klempt, Eberhard1,3 (AUTHOR) Klempt@hiskp.uni-bonn.de |
| Source: | Progress in Particle & Nuclear Physics. Jan2026:Part 2, Vol. 146, pN.PAG-N.PAG. 1p. |
| Subjects: | Baryons, Resonance, Quark models, Particles (Nuclear physics) |
| Abstract: | We review recent progress in our understanding of the nucleon excitation spectrum. Thanks to dedicated efforts at facilities such as ELSA, MAMI and Jefferson Lab, several new nucleon resonances have been discovered, and evidence for previously elusive states has been significantly improved. Numerous decay channels have been observed for the first time, and resonance properties are being extracted from these data by several groups through coupled-channel analyses of varying complexity. Electroproduction experiments have provided further insights into the internal structure of light baryon resonances — for example, the long-debated Roper resonance N (1440) is observed as a three-quark state with a significant meson-cloud component. While the non-relativistic quark model remains a valuable tool for organizing the spectrum of nucleon and Δ resonances, a variety of theoretical frameworks have emerged to offer deeper understanding, including phenomenological quark models, holographic QCD, functional methods, effective field theories, and lattice QCD. We examine the interplay between these approaches, highlight their respective strengths and explore how they complement each other in shaping our knowledge of light baryon resonances. We address several open questions in baryon spectroscopy, including the nature of the enigmatic Λ (1405) , ongoing searches for exotic states such as hybrid baryons and pentaquarks, and the dichotomy between microscopic descriptions of baryons in terms of quarks and gluons versus effective hadronic descriptions based on meson–baryon dynamics. [ABSTRACT FROM AUTHOR] |
| Copyright of Progress in Particle & Nuclear Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 189790370 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The impact of [formula omitted] and [formula omitted] interactions on our understanding of nucleon excitations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Burkert%2C+Volker%22">Burkert, Volker</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Bukert@jlab.org</i><br /><searchLink fieldCode="AR" term="%22Eichmann%2C+Gernot%22">Eichmann, Gernot</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> gernot.eichmann@uni-graz.at</i><br /><searchLink fieldCode="AR" term="%22Klempt%2C+Eberhard%22">Klempt, Eberhard</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> Klempt@hiskp.uni-bonn.de</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Progress+in+Particle+%26+Nuclear+Physics%22">Progress in Particle & Nuclear Physics</searchLink>. Jan2026:Part 2, Vol. 146, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Baryons%22">Baryons</searchLink><br /><searchLink fieldCode="DE" term="%22Resonance%22">Resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Quark+models%22">Quark models</searchLink><br /><searchLink fieldCode="DE" term="%22Particles+%28Nuclear+physics%29%22">Particles (Nuclear physics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We review recent progress in our understanding of the nucleon excitation spectrum. Thanks to dedicated efforts at facilities such as ELSA, MAMI and Jefferson Lab, several new nucleon resonances have been discovered, and evidence for previously elusive states has been significantly improved. Numerous decay channels have been observed for the first time, and resonance properties are being extracted from these data by several groups through coupled-channel analyses of varying complexity. Electroproduction experiments have provided further insights into the internal structure of light baryon resonances — for example, the long-debated Roper resonance N (1440) is observed as a three-quark state with a significant meson-cloud component. While the non-relativistic quark model remains a valuable tool for organizing the spectrum of nucleon and Δ resonances, a variety of theoretical frameworks have emerged to offer deeper understanding, including phenomenological quark models, holographic QCD, functional methods, effective field theories, and lattice QCD. We examine the interplay between these approaches, highlight their respective strengths and explore how they complement each other in shaping our knowledge of light baryon resonances. We address several open questions in baryon spectroscopy, including the nature of the enigmatic Λ (1405) , ongoing searches for exotic states such as hybrid baryons and pentaquarks, and the dichotomy between microscopic descriptions of baryons in terms of quarks and gluons versus effective hadronic descriptions based on meson–baryon dynamics. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Progress in Particle & Nuclear Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ppnp.2025.104214 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Baryons Type: general – SubjectFull: Resonance Type: general – SubjectFull: Quark models Type: general – SubjectFull: Particles (Nuclear physics) Type: general Titles: – TitleFull: The impact of [formula omitted] and [formula omitted] interactions on our understanding of nucleon excitations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Burkert, Volker – PersonEntity: Name: NameFull: Eichmann, Gernot – PersonEntity: Name: NameFull: Klempt, Eberhard IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 01 Text: Jan2026:Part 2 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 01466410 Numbering: – Type: volume Value: 146 Titles: – TitleFull: Progress in Particle & Nuclear Physics Type: main |
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