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On the Cuts of Scattering Amplitudes
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;...
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| Lenguaje: | eng |
| Publicado: |
2008
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| Acceso en línea: | https://dx.doi.org/10.1016/j.nuclphysbps.2008.09.082 http://cds.cern.ch/record/1116765 |
| Sumario: | 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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