Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology

The light-quark mass dependence of the nucleon axial isovector charge (gA) has been studied up to next-to-next-to-leading order, O(p4), in relativistic chiral perturbation theory using extended-on-mass-shell renormalization, without and with explicit Δ(1232) degrees of freedom. We show that in the Δ...

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Detalles Bibliográficos
Autores: Alvarado, Fernando, Álvarez Ruso, Luis
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/279969
Acceso en línea:http://hdl.handle.net/10261/279969
Access Level:acceso abierto
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spelling Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenologyAlvarado, FernandoÁlvarez Ruso, LuisThe light-quark mass dependence of the nucleon axial isovector charge (gA) has been studied up to next-to-next-to-leading order, O(p4), in relativistic chiral perturbation theory using extended-on-mass-shell renormalization, without and with explicit Δ(1232) degrees of freedom. We show that in the Δ-less case, at this order, the flat trend of gA(Mπ) exhibited by state-of-the-art lattice QCD (LQCD) results cannot be reproduced using low energy constants extracted from pion-nucleon elastic and inelastic scattering. A satisfactory description of these LQCD data is only achieved in the theory with Δ. From this fit, we report gA(Mπ(phys))=1.260±0.012, close to the experimental result, and d16=-0.88±0.88 GeV-2, in agreement with its empirical value. The large uncertainties are of theoretical origin, reflecting the difference between O(p3) and O(p4) that still persists at large Mπ in presence of the Δ.American Physical SocietyEuropean CommissionMinisterio de Ciencia e Innovación (España)Generalitat ValencianaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/279969reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-84038-C2-1-Pinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112777GB-I00info:eu-repo/grantAgreement/EC/H2020/824093http://dx.doi.org/10.1103/PhysRevD.105.074001Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2799692026-05-22T06:33:51Z
dc.title.none.fl_str_mv Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
title Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
spellingShingle Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
Alvarado, Fernando
title_short Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
title_full Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
title_fullStr Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
title_full_unstemmed Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
title_sort Light-quark mass dependence of the nucleon axial charge and pion-nucleon scattering phenomenology
dc.creator.none.fl_str_mv Alvarado, Fernando
Álvarez Ruso, Luis
author Alvarado, Fernando
author_facet Alvarado, Fernando
Álvarez Ruso, Luis
author_role author
author2 Álvarez Ruso, Luis
author2_role author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Ciencia e Innovación (España)
Generalitat Valenciana
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description The light-quark mass dependence of the nucleon axial isovector charge (gA) has been studied up to next-to-next-to-leading order, O(p4), in relativistic chiral perturbation theory using extended-on-mass-shell renormalization, without and with explicit Δ(1232) degrees of freedom. We show that in the Δ-less case, at this order, the flat trend of gA(Mπ) exhibited by state-of-the-art lattice QCD (LQCD) results cannot be reproduced using low energy constants extracted from pion-nucleon elastic and inelastic scattering. A satisfactory description of these LQCD data is only achieved in the theory with Δ. From this fit, we report gA(Mπ(phys))=1.260±0.012, close to the experimental result, and d16=-0.88±0.88 GeV-2, in agreement with its empirical value. The large uncertainties are of theoretical origin, reflecting the difference between O(p3) and O(p4) that still persists at large Mπ in presence of the Δ.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/279969
url http://hdl.handle.net/10261/279969
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-84038-C2-1-P
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112777GB-I00
info:eu-repo/grantAgreement/EC/H2020/824093
http://dx.doi.org/10.1103/PhysRevD.105.074001
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
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