arXiv 1604.028532016-04-11nucl-thhep-ph

π介子和K介子形状因子和部分子分布函数的味依赖性

Flavour dependence of the pion and kaon form factors and parton distribution functions

Parada T. P. Hutauruk, Ian C. Cloet, Anthony W. Thomas

备注：: 9 pages, 14 figures
发表信息：: Phys. Rev. C 94, 035201 (2016)
DOI：: 10.1103/PhysRevC.94.035201

摘要：

研究了类空区中夸克味对π介子和K介子价夸克分布函数的贡献以及相应的电磁形状因子。计算使用的解决方案的Bethe-Salpeter方程的Nambu和Jona-Lasinio与适当的时间正则化的模型。π介子和K介子的形状因子和价夸克分布函数都再现了许多可用的经验数据的特征。奇异夸克的质量越大，自然就解释了这样一个经验事实，即在大的$x$下，比值$u_{K^+}(x)/u_{π^+}(x)$降到1以下，其值约为$M^2_u/M_s^2$和$x \to 1$。关于弹性形状因子，我们报告了一个大的味依赖性，与$u$ -夸克的贡献的K介子形状因子是一个数量级小于$s$ -夸克在大$Q^2$，这可能是一个敏感的措施，在QCD的禁闭效应。令人惊讶的是，$K^+$和$π^+$的总形状因子仅相差10%。

英文摘要：

The separate quark flavour contributions to the pion and kaon valence quark distribution functions are studied, along with the corresponding electromagnetic form factors in the space-like region. The calculations are made using the solution of the Bethe-Salpeter equation for the model of Nambu and Jona-Lasinio with proper-time regularization. Both the pion and kaon form factors and the valence quark distribution functions reproduce many of the features of the available empirical data. The larger mass if the strange quark naturally explains the empirical fact that the ratio $u_{K^+}(x)/u_{π^+}(x)$ drops below unity at large $x$, with a value of approximately $M^2_u/M_s^2$ as $x \to 1$. With regard to the elastic form factors we report a large flavour dependence, with the $u$-quark contribution to the kaon form factor being an order of magnitude smaller than that of the $s$-quark at large $Q^2$, which may be a sensitive measure of confinement effects in QCD. Surprisingly though, the total $K^+$ and $π^+$ form factors differ by only 10\%.

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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英文摘要：

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