Twistor-Space Recursive Formulation of Gauge-Theory Amplitudes
arXiv:hep-th/0406133 · doi:10.1103/PhysRevD.71.045008
Abstract
Using twistor space intuition, Cachazo, Svrcek and Witten presented novel diagrammatic rules for gauge-theory amplitudes, expressed in terms of maximally helicity-violating (MHV) vertices. We define non-MHV vertices, and show how to use them to give a recursive construction of these amplitudes. We also use them to illustrate the equivalence of various twistor-space prescriptions, and to determine the associated combinatoric factors.
28 pages, 13 figures, ReVTeX; updated references, cosmetic changes to figures, minor changes to text