Eliminating spurious poles from gauge-theoretic amplitudes

Understand

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.