arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1733hep-th
收藏

N=4超杨米尔斯中散射振幅的单圈超共形和杨幂对称性

One-Loop Superconformal and Yangian Symmetries of Scattering Amplitudes in N=4 Super Yang-Mills

Niklas Beisert, Johannes Henn, Tristan McLoughlin, Jan Plefka

摘要:

最近有人认为,N=4的Yang-Mills理论中的树能级散射振幅是由它们的超共形对称性和Yangian对称性唯一决定的。然而,在一个循环顺序,这些对称性被称为成为异常,由于红外发散。我们计算这些一个循环的异常幅度定义通过维度正则化研究的树级对称变换的么正性分支切割,保持跟踪的关键共线项所产生的全纯异常。我们提取的超共形异常,并表明,它们可以通过一个通用的单圈变形的树级对称生成器,只涉及树级数据被取消。专门的平面理论,我们也得到了类似的变形为一级的动量杨格生成元。我们的单圈变形的显式检查进行MHV和6点NMHV振幅。

英文摘要:

Recently it has been argued that tree-level scattering amplitudes in N=4 Yang-Mills theory are uniquely determined by a careful study of their superconformal and Yangian symmetries. However, at one-loop order these symmetries are known to become anomalous due to infrared divergences. We compute these one-loop anomalies for amplitudes defined through dimensional regularisation by studying the tree-level symmetry transformations of the unitarity branch cuts, keeping track of the crucial collinear terms arising from the holomorphic anomaly. We extract the superconformal anomalies and show that they may be cancelled through a universal one-loop deformation of the tree-level symmetry generators which involves only tree-level data. Specialising to the planar theory we also obtain the analogous deformation for the level-one Yangian generator of momentum. Explicit checks of our one-loop deformation are performed for MHV and the 6-point NMHV amplitudes.

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。

↑