Physical projectors for multi-leg helicity amplitudes
High Energy Physics - Phenomenology
2019-09-04 v1 High Energy Physics - Theory
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.
Cite
@article{arxiv.1906.03298,
title = {Physical projectors for multi-leg helicity amplitudes},
author = {Tiziano Peraro and Lorenzo Tancredi},
journal= {arXiv preprint arXiv:1906.03298},
year = {2019}
}
Comments
18 pages