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Type: Journal article
Title: Strange-quark asymmetry in the proton in chiral effective theory
Author: Wang, X.
Ji, C.
Melnitchouk, W.
Salamu, Y.
Thomas, A.
Wang, P.
Citation: Physical Review D, 2016; 94(9):094035-1-094035-22
Publisher: American Physical Society
Issue Date: 2016
ISSN: 2470-0010
Statement of
X.G. Wang, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu, A.W. Thomas, and P. Wang
Abstract: We perform a comprehensive analysis of the strange-antistrange parton distribution function (PDF) asymmetry in the proton in the framework of chiral effective theory, including the full set of lowest-order kaon loop diagrams with off-shell and contact interactions, in addition to the usual on-shell contributions previously discussed in the literature. We identify the presence of δ-function contributions to the s‾ PDF at x = 0, with a corresponding valencelike component of the s-quark PDF at larger x, which allows greater flexibility for the shape of s- s‾. Expanding the moments of the PDFs in terms of the pseudoscalar kaon mass, we compute the leading nonanalytic behavior of the number and momentum integrals of the s and s‾ distributions, consistent with the chiral symmetry of QCD. We discuss the implications of our results for the understanding of the NuTeV anomaly and for the phenomenology of strange-quark PDFs in global QCD analysis.
Rights: © 2016 American Physical Society
RMID: 0030059642
DOI: 10.1103/PhysRevD.94.094035
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Appears in Collections:Physics publications

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