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arXiv · hep-ph/0209271

Color-flow decomposition of QCD amplitudes

F. Maltoni·K. Paul·T. Stelzer·S. Willenbrock
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Abstract

We introduce a new color decomposition for multi-parton amplitudes in QCD, free of fundamental-representation matrices and structure constants. This decomposition has a physical interpretation in terms of the flow of color, which makes it ideal for merging with shower Monte-Carlo programs. The color-flow decomposition allows for very efficient evaluation of amplitudes with many quarks and gluons, many times faster than the standard color decomposition based on fundamental-representation matrices. This will increase the speed of event generators for multi-jet processes, which are the principal backgrounds to signals of new physics at colliders.

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F. Maltoni, K. Paul, T. Stelzer, S. Willenbrock. 2002-11-22. Color-flow decomposition of QCD amplitudes. https://doi.org/10.1103/physrevd.67.014026

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