Direct proof of the tree-level scattering amplitude recursion relation in Yang-mills theory.
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.
Britto
Ruth
R
School of Natural Sciences, Institute for Advanced Study, Princeton, NJ 08540, USA.
Cachazo
Freddy
F
Feng
Bo
B
Witten
Edward
E