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arXiv 1109.0302hep-phnucl-th
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来自JIMWLK演变的高点相关性

Higher-point correlations from the JIMWLK evolution

E. Iancu, D. N. Triantafyllopoulos

摘要:

我们开发了一种新的近似方案,旨在提取更高的点关联函数从JIMWLK的演变,在颜色的数量是大的限制。也就是说,我们表明,通过利用Balitsky-JIMWLK方程中的“虚”项的结构,可以导出表示任意n点函数的威尔逊线的2点函数(彩色偶极子的散射振幅)的函数关系。这些近似是正确的,不仅在政权的强散射,其中的演变确实是由“虚拟”的条款,但也在政权的弱散射,在那里他们减少到相应的BFKL解决方案。这最后一个特征来自于JIMWLK哈密顿算子是分别负责“实”和“虚”项的部分的线性组合的事实。我们应用这个计划的两个例子:“彩色四极”(4点功能的威尔逊线进入横截面的生产对喷流在前进rapidities)和“彩色sextupole”(6点功能)。对于特定的配置的四极,我们的一般公式减少到相对简单的表达式,以前已经提出的McLerran-Venugopalan模型的基础上,最近被证明同意相当不错的精确,数值,解决方案的JIMWLK方程。

英文摘要:

We develop a new approximation scheme aiming at extracting higher-point correlation functions from the JIMWLK evolution, in the limit where the number of colors is large. Namely, we show that by exploiting the structure of the 'virtual' terms in the Balitsky-JIMWLK equations, one can derive functional relations expressing arbitrary n-point functions of the Wilson lines in terms of the 2-point function (the scattering amplitude for a color dipole). These approximations are correct not only in the regime of strong scattering, where the evolution is indeed controlled by the 'virtual' terms, but also in the regime of weak scattering, where they reduce to the corresponding BFKL solutions. This last feature follows from the fact that the JIMWLK Hamiltonian is a linear combination of the pieces responsible for the 'real' and 'virtual' terms, respectively. We apply this scheme to two examples: the 'color quadrupole' (the 4-point function of the Wilson lines which enters the cross-section for the production of a pair of jets at forward rapidities) and the 'color sextupole' (the 6-point function). For particular configurations of the quadrupole, our general formula reduces to relatively simple expressions that have been previously proposed on the basis of the McLerran-Venugopalan model and which were recently shown to agree quite well with exact, numerical, solutions to the JIMWLK equation.

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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