arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1779hep-ph
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低$Q^2$质子结构函数,在组分夸克框架中使用胶子和赝标介子云

Low $Q^2$ proton structure function, using gluon and pseudoscalar meson clouds in the constituent quark framework

A. Mirjalili, M. M. Yazdanpanah, F. Taghavi-Shahri, K. Ghorbani

摘要:

本文在构成夸克的框架下,将手征夸克模型中的介子云方法推广到胶子云,以得到核子中的部分子密度。在低$Q^2$值下,利用夸克对夸克-介子和夸克-胶子的分裂函数,得到了组分夸克中的部分子密度。采用唯象组分模型提取了低$Q^2$值下质子中的部分子分布。由于我们可以获得低$Q^2$下的部分子密度,因此我们能够获得低$Q^2$值下的$F_{2}(x,Q^2)$结构函数。计算结果与已有的实验数据和一些理论模型符合得很好。为了验证计算结果的正确性,计算了高$Q^2$时胶子携带的质子总动量的分数以及Gottfried求和规则。结果与预期的结果很一致。

英文摘要:

The idea of the meson cloud approach in the chiral quark model has been extended to include gluon cloud in order to achieve the parton densities in the nucleon, based on the constitute quark framework. The splitting function of the quark to the quark-meson and quark-gluon at low $Q^2$ value are used to obtain parton densities in the constituent quark. The phenomenological constituent model is employed to extract the parton distributions in the proton at low $Q^2$ value. Since we have access to the parton densities at low $Q^2$, we are able to obtain $F_{2}(x,Q^2)$ structure function at low $Q^2$ value. The result is in good agreement with available experimental data and some theoretical models. To confirm the validity of our calculations, the fraction of total momentum of proton which is carried by gluon at high $Q^2$ and also the Gottfried sum rule are computed. The results are in good agreement with what are expected.

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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