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https://hdl.handle.net/2440/104258
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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 2470-0029 |
Statement of Responsibility: | 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 |
DOI: | 10.1103/PhysRevD.94.094035 |
Grant ID: | http://purl.org/au-research/grants/arc/CE1101004 http://purl.org/au-research/grants/arc/FL0992247 http://purl.org/au-research/grants/arc/DP150103101 |
Published version: | http://dx.doi.org/10.1103/physrevd.94.094035 |
Appears in Collections: | Aurora harvest 7 Physics publications |
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