Closed-Form Decomposition of One-Loop Massive Amplitudes
High Energy Physics - Phenomenology
2008-11-26 v1 High Energy Physics - Theory
Abstract
We present formulas for the coefficients of 2-, 3-, 4- and 5-point master integrals for one-loop massive amplitudes. The coefficients are derived from unitarity cuts in D dimensions. The input parameters can be read off from any unitarity-cut integrand, as assembled from tree-level expressions, after simple algebraic manipulations. The formulas presented here are suitable for analytical as well as numerical evaluation. Their validity is confirmed in two known cases of helicity amplitudes contributing to gg -> gg and gg -> gH, where the masses of the Higgs and the fermion circulating in the loop are kept as free parameters.
Keywords
Cite
@article{arxiv.0803.1989,
title = {Closed-Form Decomposition of One-Loop Massive Amplitudes},
author = {Ruth Britto and Bo Feng and Pierpaolo Mastrolia},
journal= {arXiv preprint arXiv:0803.1989},
year = {2008}
}
Comments
37 pages