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.
复制标题
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
中科院分区:
文献类型:
--
作者:
R. Boels;T. Huber;Gang Yang
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.