https://doi.org/10.1140/epjc/s10052-011-1668-4
Special Article - Tools for Experiment and Theory
Generating QCD amplitudes in the color-flow basis with MadGraph
KEK Theory Center and Sokendai, Tsukuba, 305-0801, Japan
* e-mail: takaesu@post.kek.jp
Received:
28
February
2011
Published online:
31
May
2011
We propose to make use of the off-shell recursive relations with the color-flow decomposition in the calculation of QCD amplitudes on MadGraph. We introduce colored quarks and their interactions with nine gluons in the color-flow basis plus an Abelian gluon on MadGraph, such that it generates helicity amplitudes in the color-flow basis with off-shell recursive formulae for multi-gluon sub-amplitudes. We demonstrate calculations of up to 5-jet processes such as gg→5g, 
and uu→uuggg. Although our demonstration is limited, it paves the way to evaluate amplitudes with more quark lines and gluons with MadGraph.
© Springer-Verlag / Società Italiana di Fisica, 2011
