Strange-quark asymmetry in the proton in chiral effective theory
文献类型：期刊论文
| 作者 | Wang, XG; Ji, CR; Melnitchouk, W; Salamu, Y; Thomas, AW; Wang, P; Wang P(王平)
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| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2016 |
| 卷号 | 94期号:9 |
| DOI | 10.1103/PhysRevD.94.094035 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| WOS关键词 | 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 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/260631]  |
| 专题 | 中国科学院高能物理研究所 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | 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). |
入库方式： OAI收割
来源：高能物理研究所
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