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Parton distributions from nonlocal chiral SU(3) effective theory: flavor asymmetries

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dc.contributor.authorSalamu, Y.
dc.contributor.authorJi, C.-R.
dc.contributor.authorMelnitchouk, W.
dc.contributor.authorThomas, A.W.
dc.contributor.authorWang, P.
dc.contributor.authorWang, X.G.
dc.date.issued2019
dc.description.abstractUsing recently derived results for one-loop hadronic splitting functions from a nonlocal implementation of chiral effective theory, we study the contributions from pseudoscalar meson loops to flavor asymmetries in the proton. Constraining the parameters of the regulating functions by inclusive production of n, Δ++, Λ, and Σ*+ baryons in pp collisions, we compute the shape of the light antiquark asymmetry ¯d−¯u in the proton and the strange asymmetry s−¯s in the nucleon sea. With these constraints, the magnitude of the ¯d−¯u asymmetry is found to be compatible with that extracted from the Fermilab E866 Drell-Yan measurement, with no indication of a sign change at large values of x, and an integrated value in the range ⟨¯d−¯u⟩≈0.09–0.17. The s−¯s asymmetry is predicted to be positive at x>0, with compensating negative contributions at x=0, and an integrated x-weighted moment in the range ⟨x(s−¯s)⟩≈(0.9−2.5)×10−3.
dc.description.statementofresponsibilityY. Salamu, Chueng-Ryong Ji, W. Melnitchouk, A.W. Thomas, P. Wang and X. G. Wang
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology, 2019; 100(9):094026-1-094026-2
dc.identifier.doi10.1103/PhysRevD.100.094026
dc.identifier.issn0556-2821
dc.identifier.issn2470-0029
dc.identifier.orcidThomas, A.W. [0000-0003-0026-499X]
dc.identifier.orcidWang, X.G. [0000-0001-9164-0027]
dc.identifier.urihttp://hdl.handle.net/2440/122816
dc.language.isoen
dc.publisherAmerican Physical Society
dc.relation.granthttp://purl.org/au-research/grants/arc/CE110001104
dc.relation.granthttp://purl.org/au-research/grants/arc/DP151103101
dc.relation.granthttp://purl.org/au-research/grants/arc/DP180100497
dc.rightsPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
dc.source.urihttps://doi.org/10.1103/physrevd.100.094026
dc.titleParton distributions from nonlocal chiral SU(3) effective theory: flavor asymmetries
dc.typeJournal article
pubs.publication-statusPublished

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