Note on the non-adjacent BCFW deformations
arXiv:1005.4462
Abstract
As the first part, we provide a proof of the consistency condition by Kleiss-Kuijf relation and the bonus relation by BCJ relation for the non-adjacent BCFW deformations. On the other hand, rather than appealing to field theory argument, we provide an alternative proof of bonus relation for the non-adjacent BCFW deformations by a purely S matrix analysis in the context of SYM theory.
more readable version with typo corrected and references added