Gauge Theory Amplitudes, Scalar Graphs and Twistor Space

Details Gauge Theory Amplitudes, Scalar Graphs and Twistor Space Gauge Theory Amplitudes, Scalar Graphs and Twistor Space

2004-08-30

arxiv.org/abs/hep-th/0408233v2

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

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.

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