Gauge Theory Amplitudes, Scalar Graphs and Twistor Space

Abstract

We discuss a remarkable new approach initiated by Cachazo, Svrcek and Witten for calculating gauge theory amplitudes. The formalism amounts to an effective scalar perturbation theory which in many cases offers a much simpler alternative to the usual Feynman diagrams for deriving $n$-point amplitudes in gauge theory. At tree level the formalism works in a generic gauge theory, with or without supersymmetry, and for a finite number of colours. There is also a growing evidence that the formalism works for loop amplitudes.

37 pages. To appear in ``From Fields to Strings: Circumnavigating Theoretical Physics'', in memory of Ian Kogan

References in corpus (8)

• Multi-Parton Amplitudes in Gauge Theories
• One-Loop Gauge Theory Amplitudes in N=4 Super Yang-Mills from MHV Vertices
• Twistor Space Structure Of One-Loop Amplitudes In Gauge Theory
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• N=2 strings and the twistorial Calabi-Yau
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Cited by in corpus (14)

• MHV Rules for Higgs Plus Multi-Gluon Amplitudes
• Non-Supersymmetric Loop Amplitudes and MHV Vertices
• Recursion Relations for Gauge Theory Amplitudes with Massive Vector Bosons and Fermions
• One-Loop MHV Amplitudes in Supersymmetric Gauge Theories
• MHV Rules for Higgs Plus Multi-Parton Amplitudes
• The rational parts of one-loop QCD amplitudes I: The general formalism
• Marginal Deformations of N=4 SYM from Open/Closed Twistor Strings
• Orbifolding the Twistor String
• The Topological B-Model on Fattened Complex Manifolds and Subsectors of N=4 Self-Dual Yang-Mills Theory
• MHV amplitudes in N=2 SQCD and in N=4 SYM at one loop
• Summary of ICHEP 2004
• Persistent Challenges of Quantum Chromodynamics
• Yangian symmetry applied to Quantum chromodynamics
• QCD at high energies and Yangian symmetry