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.

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