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arXiv 1705.03444hep-thhep-ph
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N=4超对称Yang-Mills理论中的四圈非平面尖点反常维数

Four-Loop Nonplanar Cusp Anomalous Dimension in N=4 Supersymmetric Yang-Mills Theory

Rutger H. Boels, Tobias Huber, Gang Yang

摘要:

类光尖点反常维数是控制一般量子场论红外发散的普适函数。在最大超对称杨-米尔斯理论中,这个函数通过三圈阶的可积性完全固定。在四个循环的非平面校正出现,我们获得的第一次从数值计算的Sudakov形状因子。关键成分是广泛适用的方法来控制出现积分的数论方面。我们的结果明确表明,二次Casimir标度分解在四个循环。

英文摘要:

The light-like cusp anomalous dimension is a universal function that controls infrared divergences in quite general quantum field theories. In the maximally supersymmetric Yang-Mills theory this function is fixed fully by integrability to the three-loop order. At four loops a non-planar correction appears which we obtain for the first time from a numerical computation of the Sudakov form factor. Key ingredients are widely applicable methods to control the number-theoretic aspects of the appearing integrals. Our result shows explicitly that quadratic Casimir scaling breaks down at four loops.

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