We present a method for building physical projector operators for multi-leg helicity amplitudes. For any helicity configuration of the external particles, we define a physical projector which singles out the corresponding helicity amplitude. For processes with more than four external legs, these physical projectors depend on significantly fewer tensor structures and exhibit a remarkable simplicity compared with projector operators defined with traditional approaches. As an example, we present analytic formulas for a complete set of projectors for five-gluon scattering. These have been validated by reproducing known results for five-gluon amplitudes up to one-loop.

Peraro T., Tancredi L. (2019). Physical projectors for multi-leg helicity amplitudes. JOURNAL OF HIGH ENERGY PHYSICS, 2019(7), 1-21 [10.1007/JHEP07(2019)114].

Physical projectors for multi-leg helicity amplitudes

Peraro T.;
2019

Abstract

We present a method for building physical projector operators for multi-leg helicity amplitudes. For any helicity configuration of the external particles, we define a physical projector which singles out the corresponding helicity amplitude. For processes with more than four external legs, these physical projectors depend on significantly fewer tensor structures and exhibit a remarkable simplicity compared with projector operators defined with traditional approaches. As an example, we present analytic formulas for a complete set of projectors for five-gluon scattering. These have been validated by reproducing known results for five-gluon amplitudes up to one-loop.
2019
Peraro T., Tancredi L. (2019). Physical projectors for multi-leg helicity amplitudes. JOURNAL OF HIGH ENERGY PHYSICS, 2019(7), 1-21 [10.1007/JHEP07(2019)114].
Peraro T.; Tancredi L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/806930
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