CSW rules for massive matter legs and glue loops

TL;DR

This paper develops CSW rules for massive matter and glue loops, deriving them from the space-time action, and applies twistor techniques to extend these rules to fermions, facilitating calculations in Yang-Mills theory.

Contribution

It introduces new CSW rules for massive matter legs and glue loops directly from the space-time action, extending twistor methods to fermions.

Findings

Derived CSW rules for massive scalar legs and glue loops from space-time action.

Applied rules to compute one-loop effects in pure Yang-Mills theory.

Extended twistor techniques to massless fermions.

Abstract

Cachazo-Svrcek-Witten-type Feynman rules for massive matter scalar legs and pure glue loops are presented, obtained by deriving them directly from the space-time action. We comment on the derivation and some sample applications, in particular to calculating one loop effects in pure Yang-Mills theory. Furthermore, we derive CSW rules for effective Higgs-gluon couplings studied in the literature. In addition, it is shown how twistor techniques for deriving canonical field transformations explored for massless scalars extend to massless fermions.