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A Numerical Unitarity Formalism for One-Loop Amplitudes · Around

2008

A Numerical Unitarity Formalism for One-Loop Amplitudes

Ellis, R. Keith, Giele, Walter T., Kunszt, Zoltan

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The unitarity method for calculating one-loop amplitudes provides algorithms of polynomial complexity.

This is primarily beneficial for the computation of multi-leg one loop amplitudes and it is therefore of great interest to develop a numerical implementation of the unitarity method.
We describe a recently-developed, efficient, semi-numerical unitarity method for the computation of the cut-constructible part of one-loop amplitudes.

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Cited in the paper.

R. K. Ellis, W. T. Giele and Z. Kunszt, arXiv:0708.2398 [hep-ph]

Cited in the paper.

W. T. Giele and Z. Kunszt and K. Melnikov, arXiv:0801.2237 [hep-ph]

Cited in the paper.

R. Britto, B. Feng, arXiv:0711.4284 [hep-ph]

Cited in the paper.

A repository of one-loop master integrals can be found at http://qcdloop.fnal.gov/ . See also R.K. Ellis and G. Zanderighi, arXiv:0712.1851; J.R. Andersen, T. Binoth, G. Heinrich and J.M. Smillie, arXiv:0709.3513

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