On-shell recursion relations for all Born QCD amplitudes
High Energy Physics - Phenomenology
2010-10-27 v2 High Energy Physics - Theory
Abstract
We consider on-shell recursion relations for all Born QCD amplitudes. This includes amplitudes with several pairs of quarks and massive quarks. We give a detailed description on how to shift the external particles in spinor space and clarify the allowed helicities of the shifted legs. We proof that the corresponding meromorphic functions vanish at z --> infinity. As an application we obtain compact expressions for helicity amplitudes including a pair of massive quarks, one negative helicity gluon and an arbitrary number of positive helicity gluons.
Cite
@article{arxiv.hep-ph/0703021,
title = {On-shell recursion relations for all Born QCD amplitudes},
author = {Christian Schwinn and Stefan Weinzierl},
journal= {arXiv preprint arXiv:hep-ph/0703021},
year = {2010}
}
Comments
30 pages, minor changes