从规范理论振幅中消除寄生极点
Eliminating spurious poles from gauge-theoretic amplitudes
摘要：
本说明解决了规范理论散射振幅中的杂散极点问题。基于对偶共形不变性的概念，引入了新的动量扭量坐标。在这些坐标系中，一类NMHV振幅的寄生极点的消除被大大简化。通过定义一种新的扭量积分，与先前研究的扭量图对偶，并且相当简单，可以完全消除极点。几何特征表明至少对所有NMHV振幅的形式主义的超对称扩展，使得超振幅的二面角对称性得以显现。更一般地说，“动量扭量”坐标的定义提出了一个强大的新方法来研究散射振幅。
英文摘要：
This note addresses the problem of spurious poles in gauge-theoretic scattering amplitudes. New twistor coordinates for the momenta are introduced, based on the concept of dual conformal invariance. The cancellation of spurious poles for a class of NMHV amplitudes is greatly simplified in these coordinates. The poles are eliminated altogether by defining a new type of twistor integral, dual to twistor diagrams as previously studied, and considerably simpler. The geometric features indicate a supersymmetric extension of the formalism at least to all NMHV amplitudes, allowing the dihedral symmetry of the super-amplitude to be made manifest. More generally, the definition of `momentum-twistor' coordinates suggests a powerful new approach to the study of scattering amplitudes.
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