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arXiv 1610.03333hep-phhep-exnucl-th
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手征有效理论中质子的奇异夸克不对称性

Strange quark asymmetry in the proton in chiral effective theory

X. G. Wang, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu, A. W. Thomas, P. Wang

摘要:

我们进行了全面的分析的奇异-反奇异部分子分布函数(PDF)的不对称性的手征有效理论的框架内的质子,包括全套的最低阶K介子回路图与离壳和接触的相互作用,除了通常的壳贡献先前在文献中讨论。我们确定存在的$δ$ -功能的$\bar s$ PDF在$x=0$的贡献,与相应的类价的$s$ -夸克PDF在较大的$x$,这使得更大的灵活性的形状的$s-\bar s$的组件。展开的赝标K介子质量的PDF的时刻,我们计算的$s$和$\bar s$分布,符合QCD的手征对称性的数量和动量积分的领先的非解析行为。我们讨论了我们的结果的理解的NuTeV异常和奇异夸克PDF的现象学在全球QCD分析的影响。

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 $δ$-function contributions to the $\bar s$ PDF at $x=0$, with a corresponding valence-like component of the $s$-quark PDF at larger $x$, which allows greater flexibility for the shape of $s-\bar s$. 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 $\bar s$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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