CSW rules for massive matter legs and glue loops

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.

6 pages, to appear in the proceedings of the international conference on Loops and Legs in Quantum Field Theory, Sondershausen, 20-25 April 2008

References in corpus (12)

• Direct Proof Of Tree-Level Recursion Relation In Yang-Mills Theory
• Perturbative Gauge Theory As A String Theory In Twistor Space
• MHV Vertices And Tree Amplitudes In Gauge Theory
• MHV Rules for Higgs Plus Multi-Gluon Amplitudes
• The self-dual sector of QCD amplitudes
• Supersymmetric Gauge Theories in Twistor Space
• From Twistor Actions to MHV Diagrams
• The Lagrangian origin of MHV rules
• SUSY Ward identities for multi-gluon helicity amplitudes with massive quarks
• Structure of the MHV-rules Lagrangian
• CSW rules for a massive scalar
• S-Matrix Equivalence Theorem Evasion and Dimensional Regularisation with the Canonical MHV Lagrangian

Cited by in corpus (7)

• On-shell constructibility of tree amplitudes in general field theories
• Massive amplitudes on the Coulomb branch of N=4 SYM
• MHV Diagrams from an All-Line Recursion Relation
• Infinite Dimensional Symmetries of Self-Dual Yang-Mills
• Symmetries of the Self-Dual Sector of N=4 Super Yang-Mills on the Light Cone
• S-matrix equivalence restored
• General expressions for extra-dimensional tree amplitudes and all-plus 1-loop integrands in Q-cut representaion