physical projectors for multi-leg helicity amplitudes
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ID: 148917
2019
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Abstract
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.
| Reference Key |
peraro2019journalphysical
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| Authors | ;Tiziano Peraro;Lorenzo Tancredi |
| Journal | revista de la asociacion espanola de especialistas en medicina del trabajo |
| Year | 2019 |
| DOI |
10.1007/JHEP07(2019)114
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