Basics of generalized unitarity
By Z. Bern, Yu-tin Huang. 2011
149 citations recorded by the source corpus.
We review generalized unitarity as a means for obtaining loop amplitudes from on-shell tree amplitudes. The method is generally applicable to both supersymmetric and non-supersymmetric amplitudes, including non-planar contributions. Here, we focus mainly on Yang–Mills theory, in the context of on-shell superspaces. Given the need for regularization at loop level, we also review a six-dimensional helicity-based superspace formalism and its application to dimensional and massive regularizations. An important feature of the unitarity method is that it offers a means for carrying over any identified tree-level property of on-shell amplitudes to loop level, though sometimes in a modified form. We illustrate this with examples of dual conformal symmetry and a recently discovered duality between color and kinematics. This article is an invited review for a special issue of Journal of Physics A: Mathematical and Theoretical devoted to ‘Scattering amplitudes in gauge theories’.
Subfields: Mathematical Physics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/408d6ca32e0c49fa199b323c883407bea4c6e156
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In Mathematical Physics
In Nuclear and High Energy Physics
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Citations in the corpus
- Spinning black hole binary dynamics, scattering amplitudes, and effective field theory (2020, background): “aticpartatG4 areknownuptoquadraticinspins. ofmuchsimplergauge-theoryones,enablingexplicit(super)gravitycalculationsatremarkablyhigh ordersofperturbationtheory[44,45]. Masslessandmassivehelicitymethods[46,47]haveproven to be especially effective for calculating four-dimensional amplitudes. These tools”