Scattering amplitudes from unitarity-based reduction algorithm at the integrand-level. SAMURAI is a tool for the automated numerical evaluation of one-loop corrections to any scattering amplitudes within the dimensional-regularization scheme. It is based on the decomposition of the integrand according to the OPP-approach, extended to accommodate an implementation of the generalized $d$-dimensional unitarity-cuts technique, and uses a polynomial interpolation exploiting the Discrete Fourier Transform. SAMURAI can process integrands written either as numerator of Feynman diagrams or as product of tree-level amplitudes. We discuss some applications, among which the 6-and 8-photon scattering in QED, and the 6-quark scattering in QCD. SAMURAI has been implemented as a Fortran90 library, publicly available, and it could be a useful module for the systematic evaluation of the virtual corrections oriented towards automating next-to-leading order calculations relevant for the LHC phenomenology.

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  1. Guillet, J.Ph.; Heinrich, G.; von Soden-Fraunhofen, J.F.: Tools for NLO automation: Extension of the golem95C integral library (2014)
  2. Mastrolia, Pierpaolo; Mirabella, Edoardo; Ossola, Giovanni; Peraro, Tiziano: Multiloop integrand reduction for dimensionally regulated amplitudes (2013)
  3. Anastasiou, Charalampos; Herzog, Franz; Lazopoulos, Achilleas: The fully differential decay rate of a Higgs boson to bottom-quarks at NNLO in QCD (2012)
  4. Badger, Simon; Frellesvig, Hjalte; Zhang, Yang: Hepta-cuts of two-loop scattering amplitudes (2012)
  5. Britto, Ruth; Mirabella, Edoardo: External leg corrections in the unitarity method (2012)
  6. Pittau, R.: Primary Feynman rules to calculate the $\epsilon$-dimensional integrand of any 1-loop amplitude (2012)
  7. Cullen, G.; Guillet, J.-Ph.; Heinrich, G.; Kleinschmidt, T.; Pilon, E.; Reiter, T.; Rodgers, M.: Golem95C: a library for one-loop integrals with complex masses (2011)
  8. Frixione, Stefano: Colourful FKS subtraction (2011)
  9. Garzelli, M.V.; Malamos, I.; Pittau, R.: Feynman rules for the rational part of the electroweak 1-loop amplitudes in the $R_\xi $ gauge and in the unitary gauge (2011)
  10. Hirschi, Valentin; Frederix, Rikkert; Frixione, Stefano; Garzelli, Maria Vittoria; Maltoni, Fabio; Pittau, Roberto: Automation of one-loop QCD computations (2011)
  11. Ita, Harald: Susy theories and QCD: numerical approaches (2011)
  12. Mastrolia, Pierpaolo; Ossola, Giovanni: On the integrand-reduction method for two-loop scattering amplitudes (2011)
  13. Gehrmann, T.; Greiner, N.: Photon radiation with MadDipole (2010)
  14. Heinrich, G.; Ossola, G.; Reiter, T.; Tramontano, F.: Tensorial reconstruction at the integrand level (2010)
  15. Mastrolia, P.; Ossola, G.; Reiter, T.; Tramontano, F.: Scattering amplitudes from unitarity-based reduction algorithm at the integrand-level (2010)