Abstract
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, \(u\overline{u}\rightarrow5g\) and uu→uuggg. Although our demonstration is limited, it paves the way to evaluate amplitudes with more quark lines and gluons with MadGraph.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
T. Stelzer, W.F. Long, Comput. Phys. Commun. 81, 357 (1994)
J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, F. Maltoni, T. Plehn, D.L. Rainwaterd, T. Stelzer, J. High Energy Phys. 0709, 028 (2007)
K. Hagiwara, J. Kanzaki, N. Okamura, D. Rainwater, T. Stelzer, arXiv:0909.5257
K. Hagiwara, H. Murayama, I. Watanabe, Nucl. Phys. B 367, 257 (1991)
H. Murayama, I. Watanabe, K. Hagiwara, KEK-Report 91–11, 001 (1992)
K. Hagiwara, J. Kanzaki, N. Okamura, D. Rainwater, T. Stelzer, Eur. Phys. J. C 66, 477 (2009)
A. Kanaki, C.G. Papadopoulos, hep-ph/0012004v1
M.L. Mangano, M. Moretti, F. Piccinini, R. Pittau, A.D. Polosa, J. High Energy Phys. 0307, 001 (2003)
W. Giele, G. Stavenga, J.-C. Winter, arXiv:1002.3446 [hep-ph]
F. Maltoni, K. Paul, T. Stelzer, S. Willenbrock, Phys. Rev. D 67, 014026 (2003)
F.A. Berends, W.T. Giele, Nucl. Phys. B 306, 759 (1988)
M.L. Mangano, S.J. Parke, Phys. Rep. 200, 301 (1991)
G.-C. Cho, K. Hagiwara, J. Kanzaki, T. Plehn, D. Rainwater, T. Stelzer, Phys. Rev. D 73, 054002 (2006)
CTEQ Collaboration, H.L. Lai et al., Eur. Phys. J. C 12, 375 (2000)
S. Kawabata, Comput. Phys. Commun. 41, 127 (1986)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Hagiwara, K., Takaesu, Y. Generating QCD amplitudes in the color-flow basis with MadGraph. Eur. Phys. J. C 71, 1668 (2011). https://doi.org/10.1140/epjc/s10052-011-1668-4
Received:
Published:
DOI: https://doi.org/10.1140/epjc/s10052-011-1668-4