Structure of the nucleon's low-lying excitations

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dc.contributor.authorChen, Chen [UNESP]
dc.contributor.authorEl-Bennich, Bruno
dc.contributor.authorRoberts, Craig D.
dc.contributor.authorSchmidt, Sebastian M.
dc.contributor.authorSegovia, Jorge
dc.contributor.authorWan, Shaolong
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade Cruzeiro Do sul
dc.contributor.institutionArgonne National Laboratory
dc.contributor.institutionJARA
dc.contributor.institutionUniversitat Autònoma de Barcelona
dc.contributor.institutionUniversity of Science and Technology of China
dc.date.accessioned2022-04-29T08:27:14Z
dc.date.available2022-04-29T08:27:14Z
dc.date.issued2018-02-01
dc.description.abstractA 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.en
dc.description.affiliationInstituto de Física Teórica Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271
dc.description.affiliationUniversidade Cruzeiro Do sul, Rua Galvão Bueno, 868
dc.description.affiliationPhysics Division Argonne National Laboratory
dc.description.affiliationInstitute for Advanced Simulation Forschungszentrum Jülich JARA
dc.description.affiliationInstitut de Física d'Altes Energies (IFAE) Barcelona Institute of Science and Technology (BIST) Universitat Autònoma de Barcelona
dc.description.affiliationInstitute for Theoretical Physics Department of Modern Physics University of Science and Technology of China
dc.description.affiliationUnespInstituto de Física Teórica Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz, 271
dc.description.sponsorshipU.S. Department of Energy
dc.description.sponsorshipNational Natural Science Foundation of China
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipOffice of Science
dc.description.sponsorshipIdNational Natural Science Foundation of China: 11275180
dc.description.sponsorshipIdFAPESP: 2015/21550-4
dc.identifierhttp://dx.doi.org/10.1103/PhysRevD.97.034016
dc.identifier.citationPhysical Review D, v. 97, n. 3, 2018.
dc.identifier.doi10.1103/PhysRevD.97.034016
dc.identifier.issn2470-0029
dc.identifier.issn2470-0010
dc.identifier.scopus2-s2.0-85043365141
dc.identifier.urihttp://hdl.handle.net/11449/228519
dc.language.isoeng
dc.relation.ispartofPhysical Review D
dc.sourceScopus
dc.titleStructure of the nucleon's low-lying excitationsen
dc.typeArtigo

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