MHV vertices and tree amplitudes in gauge theory

@article{Cachazo2004MHVVA,
  title={MHV vertices and tree amplitudes in gauge theory},
  author={Freddy Cachazo and Peter Svr{\vc}ek and Edward Witten},
  journal={Journal of High Energy Physics},
  year={2004},
  volume={2004},
  pages={006-006}
}
As an alternative to the usual Feynman graphs, tree amplitudes in Yang-Mills theory can be constructed from tree graphs in which the vertices are tree level MHV scattering amplitudes, continued off shell in a particular fashion. The formalism leads to new and relatively simple formulas for many amplitudes, and can be heuristically derived from twistor space. 

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