arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.04235hep-ph
收藏

Sudakov压制Balitsky-Kovchegov方程的解及其在HERA资料中的应用

Solution to the Sudakov suppressed Balitsky-Kovchegov equation and its application to the HERA data

Wenchang Xiang, Mengliang Wang, Yanbing Cai, Daicui Zhou

摘要:

我们解析地求解了具有饱和区固定和运行的耦合常数的苏达科夫抑制的Balitsky-Kovchegov发展方程。$S$ -矩阵的解析解表明,在最小偶极运行耦合情况下,具有固定耦合常数的解的$\exp(\mathcal{O}(η^2))$快度依赖性被$\exp(\mathcal{O}(η^{3/2}))$依赖性取代,而不是遵守我们先前出版物中发现的定律,其中所有的解都是当QCD耦合从固定耦合切换到最小偶极运行耦合时,首阶演化方程满足$\exp(\mathcal{O}(η))$快度依赖处方.这一发现表明,Sudakov压缩演化方程中的次超前双周期项的修正是显著的,它补偿了部分由运行耦合效应引起的偶极振幅的演化衰减。为了验证分析结果,我们计算了Sudakov抑制发展方程的数值解,数值结果证实了分析结果。此外,我们使用演化方程的数值解来拟合HERA数据。结果表明,Sudakove压制演化方程能较好地拟合数据。

英文摘要:

We analytically solve the Sudakov suppressed Balitsky-Kovchegov evolution equation with the fixed and running coupling constants in the saturation region. The analytic solution of the $S$-matrix shows the $\exp(\mathcal{O}(η^2))$ rapidity dependence of the solution with the fixed coupling constant is replaced by $\exp(\mathcal{O}(η^{3/2}))$ dependence in the smallest dipole running coupling case rather than obeying the law found in our previous publication, in which all the solutions of the next-to-leading order evolution equations comply with $\exp(\mathcal{O}(η))$ rapidity dependence once the QCD coupling is switched from the fixed coupling to the smallest dipole running coupling prescription. This finding indicates that the corrections of the sub-leading double logarithms in the Sudakov suppressed evolution equation are significant, which compensate part of the evolution decrease of the dipole amplitude made by running coupling effect. To test the analytic findings, we calculate the numerical solutions of the Sudakov suppressed evolution equation, the numerical results confirm the analytic outcomes. Moreover, we use the numerical solutions of the evolution equation to fit the HERA data. It shows that the Sudakove suppressed evolution equation can give good quality fit to the data.

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。

↑