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Reducing full one-loop amplitudes to scalar integrals at the integrand level

Giovanni Ossola·Costas G. Papadopoulos·Roberto Pittau
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Abstract

We show how to extract the coefficients of the 4-, 3-, 2- and 1-point one-loop scalar integrals from the full one-loop amplitude of arbitrary scattering processes. In a similar fashion, also the rational terms can be derived. Basically no information on the analytical structure of the amplitude is required, making our method appealing for an efficient numerical implementation

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Giovanni Ossola, Costas G. Papadopoulos, Roberto Pittau. 2006-11-29. Reducing full one-loop amplitudes to scalar integrals at the integrand level. https://doi.org/10.1016/j.nuclphysb.2006.11.012

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