Dual superconformal invariance, momentum twistors and Grassmannians

@inproceedings{Mason2009DualSI,
  title={Dual superconformal invariance, momentum twistors and Grassmannians},
  author={Lionel J. Mason and David Skinner},
  year={2009}
}
Dual superconformal invariance has recently emerged as a hidden symmetry of planar scattering amplitudes in N = 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… CONTINUE READING

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