Multi-gluon one-loop amplitudes numerically

Abstract

A c++ implementation of the D_s-dimensional unitarity cut algorithm for the numerical evaluation of the virtual contribution to NLO QCD amplitudes is presented. The current version includes an arbitrary number of external gluons with gluonic propagators in the loop. The building blocks are tree level color-ordered amplitudes with gluons and with gluons and two scalars in five dimensions. Numerical stability issues are addressed and agreement has been reached with the results published in the literature.

17 pages, 3 figures

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• NLO QCD corrections to top quark pair production in association with one hard jet at hadron colliders
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• Towards pp -> VVjj at NLO QCD: Bosonic contributions to triple vector boson production plus jet
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