Colourful FKS subtraction. (English) Zbl 1301.81294
Summary: I formulate in a colour-friendly way the FKS method for the computation of QCD cross sections at the next-to-leading order accuracy. This is achieved through the definition of subtraction terms for squared matrix elements, constructed with single colour-dressed or pairs of colour-ordered amplitudes. The latter approach relies on the use of colour flows, is exact to all orders in \(N\), and is thus particularly suited to being organized as a systematic expansion in 1/\(N\).
MSC:
| 81V05 | Strong interaction, including quantum chromodynamics |
| 81U05 | \(2\)-body potential quantum scattering theory |
| 81T15 | Perturbative methods of renormalization applied to problems in quantum field theory |
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