Dual superconformal invariance, momentum twistors and Grassmannians

@article{Mason2009DualSI,
  title={Dual superconformal invariance, momentum twistors and Grassmannians},
  author={Lionel Mason and David Skinner},
  journal={Journal of High Energy Physics},
  year={2009},
  volume={2009},
  pages={045-045}
}
Dual superconformal invariance has recently emerged as a hidden symmetry of planar scattering amplitudes in = 4 super Yang-Mills theory. This symmetry can be made manifest by expressing amplitudes in terms of `momentum twistors', as opposed to the usual twistors that make the ordinary superconformal properties manifest. The relation between momentum twistors and on-shell momenta is algebraic, so the translation procedure does not rely on any choice of space-time signature. We show that tree… 

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