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arXiv 1105.4155hep-phnucl-th
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双胶子关联和小-x演化的初始条件

Two-gluon correlations and initial conditions for small-x evolution

Adrian Dumitru, Jamal Jalilian-Marian, Elena Petreska

摘要:

我们导出了硬大x价电荷的有效作用量,直到它们的密度达到四阶。这种非高斯的权泛函在N_c中处于主导地位,对决定双强子关联的连通双胶子产生图有贡献。相应的图不一定(高度)抑制的价电荷密度,因为它们的红外发散不同的高斯理论中获得的。因此,在确定威尔逊线的高n点函数的JIMWLK演化的初始系综时,包括这样的高维算子似乎是明智的。

英文摘要:

We derive the effective action of the hard large-x valence charges up to fourth order in their density. Such non-Gaussian weight functionals contribute at leading order in N_c to the connected two-gluon production diagrams which determine di-hadron correlations. The corresponding diagrams are not necessarily (highly) suppressed by the density of valence charges since their infrared divergences differ from those obtained in a Gaussian theory. Therefore, it appears prudent to include such higher dimensional operators when determining initial ensembles for JIMWLK evolution of higher n-point functions of Wilson lines.

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