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Strange-quark asymmetry in the proton in chiral effective theory
Wang, XG; Ji, CR; Melnitchouk, W; Salamu, Y; Thomas, AW; Wang, P; Wang P(王平)
2016
发表期刊PHYSICAL REVIEW D
卷号94期号:9
文章类型Article
摘要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 delta-function contributions to the (s) over bar 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) over bar. 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) over bar 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.
DOI10.1103/PhysRevD.94.094035
关键词[WOS]DEEP-INELASTIC-SCATTERING ; VIOLATING ELECTRON-SCATTERING ; PERTURBATION-THEORY ; ELASTIC-SCATTERING ; PARTON DISTRIBUTIONS ; NUCLEON SCATTERING ; SYMMETRY-BREAKING ; POLARIZED PROTONS ; FLAVOR ASYMMETRY ; MATRIX-ELEMENTS
语种英语
WOS记录号WOS:000388823900007
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260631
专题理论物理室
作者单位中国科学院高能物理研究所
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Wang, XG,Ji, CR,Melnitchouk, W,et al. Strange-quark asymmetry in the proton in chiral effective theory[J]. PHYSICAL REVIEW D,2016,94(9).
APA Wang, XG.,Ji, CR.,Melnitchouk, W.,Salamu, Y.,Thomas, AW.,...&王平.(2016).Strange-quark asymmetry in the proton in chiral effective theory.PHYSICAL REVIEW D,94(9).
MLA Wang, XG,et al."Strange-quark asymmetry in the proton in chiral effective theory".PHYSICAL REVIEW D 94.9(2016).
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