Planar amplitudes in maximally supersymmetric Yang-Mills theory.

@article{Anastasiou2003PlanarAI,
  title={Planar amplitudes in maximally supersymmetric Yang-Mills theory.},
  author={Charalampos Anastasiou and Lance J. Dixon and Zvi Bern and David A. Kosower},
  journal={Physical review letters},
  year={2003},
  volume={91 25},
  pages={
          251602
        }
}
The collinear factorization properties of two-loop scattering amplitudes in dimensionally regulated N=4 super-Yang-Mills theory suggest that, in the planar ('t Hooft) limit, higher-loop contributions can be expressed entirely in terms of one-loop amplitudes. We demonstrate this relation explicitly for the two-loop four-point amplitude and, based on the collinear limits, conjecture an analogous relation for n-point amplitudes. The simplicity of the relation is consistent with intuition based on… 

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