On the Cuts of Scattering Amplitudes
classification
✦ hep-ph
keywords
amplitudescomplexintegralsscatteringanalysiscomputingconditionscontour
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The use of complex analysis for computing one-loop scattering amplitudes is naturally induced by generalised unitarity-cut conditions, fulfilled by complex values of the loop variable. We report on two techniques: the cut-integration with spinor-variables as contour integrals of rational functions; and the use of the Discrete Fourier Transform to optimize the reduction of tensor-integrals to master scalar integrals.
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