Generating QCD amplitudes in the color-flow basis with MadGraph

Details Generating QCD amplitudes in the color-flow basis with MadGraph Generating QCD amplitudes in the color-flow basis with MadGraph

2010-10-05

arxiv.org/abs/1010.0748v3

Eur.Phys.J.C71:1668,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 13 figures

Scientific paper

10.1140/epjc/s10052-011-1668-4

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 $gg\rightarrow 5g$, $u\bar{u}\rightarrow 5g$ and $uu\rightarrow uuggg$. Although our demonstration is limited, it paves the way to evaluate amplitudes with more quark lines and gluons with Madgraph.

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