Color-flow decomposition of QCD amplitudes
High Energy Physics - Phenomenology
2009-11-07 v2
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.
Cite
@article{arxiv.hep-ph/0209271,
title = {Color-flow decomposition of QCD amplitudes},
author = {F. Maltoni and K. Paul and T. Stelzer and S. Willenbrock},
journal= {arXiv preprint arXiv:hep-ph/0209271},
year = {2009}
}
Comments
23 pages, 11 figures, version to appear on Phys. Rev. D