Generalized Unitarity and Six-Dimensional Helicity

Details Generalized Unitarity and Six-Dimensional Helicity Generalized Unitarity and Six-Dimensional Helicity

2010-10-04

arxiv.org/abs/1010.0494v2

Phys.Rev.D83:085022,2011

Physics

High Energy Physics

High Energy Physics - Theory

38 pages, 7 figures, typos corrected

Scientific paper

10.1103/PhysRevD.83.085022

We combine the unitarity method with the six-dimensional helicity formalism of Cheung and O'Connell to construct loop-level scattering amplitudes. As a first example, we construct dimensionally regularized QCD one-loop four-point amplitudes. As a nontrivial multiloop example, we confirm that the recently constructed four-loop four-point amplitude of N=4 super-Yang-Mills theory, including nonplanar contributions, is valid for dimensions less than or equal to six. We comment on the connection of our approach to the recently discussed Higgs infrared regulator and on dual conformal properties in six dimensions.

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