Automating dipole subtraction

Abstract

We report on automating the Catani-Seymour dipole subtraction which is a general procedure to treat infrared divergences in real emission processes at next-to-leading order in QCD. The automatization rests on three essential steps: the creation of the dipole terms, the calculation of the color linked squared Born matrix elements, and the evaluation of different helicity amplitudes. The routines have been tested for a number of complex processes, such as the real emission process gg --> t anti-t ggg.

Latex, 6 pages, 1 figure. To appear in the proceedings of `Loops and Legs in Quantum Field Theory', April 2008, Sondershausen, Germany

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• Precise Predictions for W + 3 Jet Production at Hadron Colliders
• Polarizing the Dipoles
• Next-to-Leading Order QCD Predictions for Z,gamma^*+3-Jet Distributions at the Tevatron
• Antenna subtraction at NNLO with hadronic initial states: double real radiation for initial-initial configurations with two quark flavours
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• Super AutoDipole
• Dipole Splitting Algorithm -- A practical algorithm to use the dipole subtraction procedure --
• A proof algorithm associated with the dipole splitting algorithm