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

Four-Loop Nonplanar Cusp Anomalous Dimension in N=4 Supersymmetric Yang-Mills Theory.
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N=4 超对称杨米尔斯理论中的四环非平面尖点异常尺寸。

DOI:
10.1103/physrevlett.119.201601
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发表时间:
2017
影响因子:
8.6
通讯作者:
Gang Yang
Gang Yang
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
R. Boels;T. Huber;Gang Yang

文献摘要

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类光尖点反常维数是在相当一般的规范理论中控制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。
The lightlike cusp anomalous dimension is a universal function that controls infrared divergences in quite general gauge theories. In the maximally supersymmetric Yang-Mills theory this function is fixed fully by integrability to the three-loop order. At four loops a nonplanar 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.