Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/100878
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dc.contributor.authorLi, H.en
dc.contributor.authorWang, P.en
dc.contributor.authorLeinweber, D.en
dc.contributor.authorThomas, A.en
dc.date.issued2016en
dc.identifier.citationPhysical Review C, 2016; 93(4):045203-1-045203-6en
dc.identifier.issn2469-9985en
dc.identifier.issn2469-9993en
dc.identifier.urihttp://hdl.handle.net/2440/100878-
dc.description.abstractProton spin is investigated in chiral effective field theory through an examination of the singlet axial charge, a 0 , and the two nonsinglet axial charges, a 3 and a 8 . Finite-range regularization is considered as it provides an effective model for estimating the role of disconnected sea-quark loop contributions to baryon observables. Baryon octet and decuplet intermediate states are included to enrich the spin and flavor structure of the nucleon, redistributing spin under the constraints of chiral symmetry. In this context, the proton spin puzzle is well understood with the calculation describing all three of the axial charges reasonably well. The strange quark contribution to the proton spin is negative with magnitude 0.01. With appropriate Q 2 evolution, we find the singlet axial charge at the experimental scale to be ˆ a 0 = 0 . 31 + 0 . 04 − 0 . 05 , consistent with the range of current experimental valuesen
dc.description.statementofresponsibilityHongna Li, P. Wang, D.B. Leinweber, and A.W. Thomasen
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.rights© 2016 American Physical Societyen
dc.titleSpin of the proton in chiral effective field theoryen
dc.typeJournal articleen
dc.identifier.rmid0030046917en
dc.identifier.doi10.1103/PhysRevC.93.045203en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP140103067en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103164en
dc.relation.granthttp://purl.org/au-research/grants/arc/FL0992247en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP150103101en
dc.identifier.pubid245000-
pubs.library.collectionPhysics publicationsen
pubs.library.teamDS14en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidLeinweber, D. [0000-0002-4745-6027]en
dc.identifier.orcidThomas, A. [0000-0003-0026-499X]en
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