Direct proof of the tree-level scattering amplitude recursion relation in Yang-mills theory.

  title={Direct proof of the tree-level scattering amplitude recursion relation in Yang-mills theory.},
  author={Ruth Britto and Freddy Cachazo and Bo Feng and Edward Witten},
  journal={Physical review letters},
  volume={94 18},
Recently, by using the known structure of one-loop scattering amplitudes for gluons in Yang-Mills theory, a recursion relation for tree-level scattering amplitudes has been deduced. Here, we give a short and direct proof of this recursion relation based on properties of tree-level amplitudes only. 

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