Full one-loop amplitudes from tree amplitudes
High Energy Physics - Phenomenology
2009-09-17 v1
Abstract
We establish an efficient polynomial-complexity algorithm for one-loop calculations, based on generalized -dimensional unitarity. It allows automated computations of both cut-constructible {\it and} rational parts of one-loop scattering amplitudes from on-shell tree amplitudes. We illustrate the method by (re)-computing all four-, five- and six-gluon scattering amplitudes in QCD at one-loop.
Cite
@article{arxiv.0801.2237,
title = {Full one-loop amplitudes from tree amplitudes},
author = {Walter T. Giele and Zoltan Kunszt and Kirill Melnikov},
journal= {arXiv preprint arXiv:0801.2237},
year = {2009}
}
Comments
27 pages, revtex