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We present a novel set of Feynman rules and generalised unitaritycut-conditions for computing one-loop amplitudes via d-dimensional integrandreduction algorithm. Our algorithm is suited for analytic as well as numericalresult, because all ingredients turn out to have a four-dimensionalrepresentation. We will apply this formalism to NLO QCD corrections.

Generalised Unitarity for Dimensionally Regulated Amplitudes