Structure of the nucleon's low-lying excitations

Detalhes bibliográficos
Autor(a) principal: Chen, Chen [UNESP]
Data de Publicação: 2018
Outros Autores: El-Bennich, Bruno, Roberts, Craig D., Schmidt, Sebastian M., Segovia, Jorge, Wan, Shaolong
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1103/PhysRevD.97.034016
http://hdl.handle.net/11449/228519
Resumo: A continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a comparative study of the four lightest (I=1/2,JP=1/2±) baryon isospin doublets in order to elucidate their structural similarities and differences. Such analyses predict the presence of nonpointlike, electromagnetically active quark-quark (diquark) correlations within all baryons; and in these doublets, isoscalar-scalar, isovector-pseudovector, isoscalar-pseudoscalar, and vector diquarks can all play a role. In the two lightest (1/2,1/2+) doublets, however, scalar and pseudovector diquarks are overwhelmingly dominant. The associated rest-frame wave functions are largely S-wave in nature; and the first excited state in this 1/2+ channel has the appearance of a radial excitation of the ground state. The two lightest (1/2,1/2-) doublets fit a different picture: accurate estimates of their masses are obtained by retaining only pseudovector diquarks; in their rest frames, the amplitudes describing their dressed-quark cores contain roughly equal fractions of even- and odd-parity diquarks; and the associated wave functions are predominantly P-wave in nature, but possess measurable S-wave components. Moreover, the first excited state in each negative-parity channel has little of the appearance of a radial excitation. In quantum field theory, all differences between positive- and negative-parity channels must owe to chiral symmetry breaking, which is overwhelmingly dynamical in the light-quark sector. Consequently, experiments that can validate the contrasts drawn herein between the structure of the four lightest (1/2,1/2±) doublets will prove valuable in testing links between emergent mass generation and observable phenomena and, plausibly, thereby revealing dynamical features of confinement.
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spelling Structure of the nucleon's low-lying excitationsA continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a comparative study of the four lightest (I=1/2,JP=1/2±) baryon isospin doublets in order to elucidate their structural similarities and differences. Such analyses predict the presence of nonpointlike, electromagnetically active quark-quark (diquark) correlations within all baryons; and in these doublets, isoscalar-scalar, isovector-pseudovector, isoscalar-pseudoscalar, and vector diquarks can all play a role. In the two lightest (1/2,1/2+) doublets, however, scalar and pseudovector diquarks are overwhelmingly dominant. The associated rest-frame wave functions are largely S-wave in nature; and the first excited state in this 1/2+ channel has the appearance of a radial excitation of the ground state. The two lightest (1/2,1/2-) doublets fit a different picture: accurate estimates of their masses are obtained by retaining only pseudovector diquarks; in their rest frames, the amplitudes describing their dressed-quark cores contain roughly equal fractions of even- and odd-parity diquarks; and the associated wave functions are predominantly P-wave in nature, but possess measurable S-wave components. Moreover, the first excited state in each negative-parity channel has little of the appearance of a radial excitation. In quantum field theory, all differences between positive- and negative-parity channels must owe to chiral symmetry breaking, which is overwhelmingly dynamical in the light-quark sector. Consequently, experiments that can validate the contrasts drawn herein between the structure of the four lightest (1/2,1/2±) doublets will prove valuable in testing links between emergent mass generation and observable phenomena and, plausibly, thereby revealing dynamical features of confinement.U.S. Department of EnergyNational Natural Science Foundation of ChinaFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Office of ScienceInstituto de Física Teórica Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271Universidade Cruzeiro Do sul, Rua Galvão Bueno, 868Physics Division Argonne National LaboratoryInstitute for Advanced Simulation Forschungszentrum Jülich JARAInstitut de Física d'Altes Energies (IFAE) Barcelona Institute of Science and Technology (BIST) Universitat Autònoma de BarcelonaInstitute for Theoretical Physics Department of Modern Physics University of Science and Technology of ChinaInstituto de Física Teórica Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271National Natural Science Foundation of China: 11275180FAPESP: 2015/21550-4Universidade Estadual Paulista (UNESP)Universidade Cruzeiro Do sulArgonne National LaboratoryJARAUniversitat Autònoma de BarcelonaUniversity of Science and Technology of ChinaChen, Chen [UNESP]El-Bennich, BrunoRoberts, Craig D.Schmidt, Sebastian M.Segovia, JorgeWan, Shaolong2022-04-29T08:27:14Z2022-04-29T08:27:14Z2018-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevD.97.034016Physical Review D, v. 97, n. 3, 2018.2470-00292470-0010http://hdl.handle.net/11449/22851910.1103/PhysRevD.97.0340162-s2.0-85043365141Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review Dinfo:eu-repo/semantics/openAccess2022-04-29T08:27:14Zoai:repositorio.unesp.br:11449/228519Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:14:58.748355Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Structure of the nucleon's low-lying excitations
title Structure of the nucleon's low-lying excitations
spellingShingle Structure of the nucleon's low-lying excitations
Chen, Chen [UNESP]
title_short Structure of the nucleon's low-lying excitations
title_full Structure of the nucleon's low-lying excitations
title_fullStr Structure of the nucleon's low-lying excitations
title_full_unstemmed Structure of the nucleon's low-lying excitations
title_sort Structure of the nucleon's low-lying excitations
author Chen, Chen [UNESP]
author_facet Chen, Chen [UNESP]
El-Bennich, Bruno
Roberts, Craig D.
Schmidt, Sebastian M.
Segovia, Jorge
Wan, Shaolong
author_role author
author2 El-Bennich, Bruno
Roberts, Craig D.
Schmidt, Sebastian M.
Segovia, Jorge
Wan, Shaolong
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Universidade Cruzeiro Do sul
Argonne National Laboratory
JARA
Universitat Autònoma de Barcelona
University of Science and Technology of China
dc.contributor.author.fl_str_mv Chen, Chen [UNESP]
El-Bennich, Bruno
Roberts, Craig D.
Schmidt, Sebastian M.
Segovia, Jorge
Wan, Shaolong
description A continuum approach to the three valence-quark bound-state problem in quantum field theory is used to perform a comparative study of the four lightest (I=1/2,JP=1/2±) baryon isospin doublets in order to elucidate their structural similarities and differences. Such analyses predict the presence of nonpointlike, electromagnetically active quark-quark (diquark) correlations within all baryons; and in these doublets, isoscalar-scalar, isovector-pseudovector, isoscalar-pseudoscalar, and vector diquarks can all play a role. In the two lightest (1/2,1/2+) doublets, however, scalar and pseudovector diquarks are overwhelmingly dominant. The associated rest-frame wave functions are largely S-wave in nature; and the first excited state in this 1/2+ channel has the appearance of a radial excitation of the ground state. The two lightest (1/2,1/2-) doublets fit a different picture: accurate estimates of their masses are obtained by retaining only pseudovector diquarks; in their rest frames, the amplitudes describing their dressed-quark cores contain roughly equal fractions of even- and odd-parity diquarks; and the associated wave functions are predominantly P-wave in nature, but possess measurable S-wave components. Moreover, the first excited state in each negative-parity channel has little of the appearance of a radial excitation. In quantum field theory, all differences between positive- and negative-parity channels must owe to chiral symmetry breaking, which is overwhelmingly dynamical in the light-quark sector. Consequently, experiments that can validate the contrasts drawn herein between the structure of the four lightest (1/2,1/2±) doublets will prove valuable in testing links between emergent mass generation and observable phenomena and, plausibly, thereby revealing dynamical features of confinement.
publishDate 2018
dc.date.none.fl_str_mv 2018-02-01
2022-04-29T08:27:14Z
2022-04-29T08:27:14Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1103/PhysRevD.97.034016
Physical Review D, v. 97, n. 3, 2018.
2470-0029
2470-0010
http://hdl.handle.net/11449/228519
10.1103/PhysRevD.97.034016
2-s2.0-85043365141
url http://dx.doi.org/10.1103/PhysRevD.97.034016
http://hdl.handle.net/11449/228519
identifier_str_mv Physical Review D, v. 97, n. 3, 2018.
2470-0029
2470-0010
10.1103/PhysRevD.97.034016
2-s2.0-85043365141
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Physical Review D
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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