arXiv 1810.040322018-10-09hep-phnucl-th

介子云对K介子夸克分布函数和SU（3）味对称性的影响

Meson cloud effects on kaon quark distribution functions and the SU(3) flavor symmetry

Akira Watanabe, Takahiro Sawada, Chung Wen Kao

备注：: 5 pages, 6 figures, prepared for the proceedings of the 21st International Conference in Quantum Chromodynamics (QCD 18), 2 - 6 July 2018, Montpellier, France

摘要：

在考虑介子云效应的手征组分夸克模型的框架下，分析了$K^{+}$介子、$v^{K (u)} (x, Q^2)$和$v^{K (\bar{s})} (x, Q^2)$的价夸克分布函数.在初始尺度下，假设适当的裸夸克分布函数，用该模型计算Goldstone玻色子的修整修正，并进行QCD演化，就可以得到一定尺度下真实的修整分布。在前面的研究中，我们得到了唯象上满意的π介子的价夸克分布，并且得到了价$u$夸克分布比$v^{K(u)} (x, Q^2) / v^{π(u)} (x, Q^2)$的实验数据，这使我们能够得到K介子的夸克分布函数.除了介绍由此产生的装扮分布，我们还显示了介子云效应如何影响裸分布的细节。一个引人注目的结果是，观察到的SU（3）味对称性破缺的大小是相当小的，比以前的工作中看到的其他方法的基础上。

英文摘要：

We present our analysis on the valence quark distribution functions of the $K^{+}$ meson, $v^{K (u)} (x, Q^2)$ and $v^{K (\bar{s})} (x, Q^2)$, taking into account the meson cloud effects in the framework of the chiral constituent quark model. Assuming appropriate bare quark distribution functions at the initial scale, evaluating the Goldstone boson dressing corrections with the model, and performing the QCD evolution, one can obtain the realistic dressed distributions at a certain scale. The phenomenologically satisfactory valence quark distribution of the pion was obtained in the previous study and there are available experimental data of the valence $u$ quark distribution ratio $v^{K(u)} (x, Q^2) / v^{π(u)} (x, Q^2)$, which enable us to obtain the kaon quark distribution functions. Besides presenting the resulting dressed distributions, we also show how the meson cloud effects affect the bare distributions in detail. A striking result is that the observed size of the SU(3) flavor symmetry breaking is considerably smaller than those seen in the preceding works based on other approaches.

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。

摘要：

英文摘要：

相关论文