CSW rules for a massive scalar

Abstract

We derive the analog of the Cachazo-Svrcek-Witten (CSW) diagrammatic Feynman rules for four dimensional Yang-Mills gauge theory coupled to a massive colored scalar. The mass term is shown to give rise to a new tower of vertices in addition to the CSW vertices for massless scalars in non-supersymmetric theories. The rules are derived directly from an action, once through a canonical transformation within light-cone Yang-Mills and once by the construction of a twistor action. The rules are tested against known results in several examples and are used to simplify the proof of on-shell recursion relations for amplitudes with massive scalars.

12 pages, 2 figures; v2: minor typos corrected and clarifications added, published version

References in corpus (3)

• From Twistor Actions to MHV Diagrams
• One-loop MHV Rules and Pure Yang-Mills
• A quantization of twistor Yang-Mills theory through the background field method

Cited by in corpus (4)

• Twistor-inspired construction of massive quark amplitudes
• CSW rules for massive matter legs and glue loops
• Recent developments for multi-leg QCD amplitudes with massive particles
• MHV Lagrangians for Yang--Mills and QCD