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Spin polarisation of \(t\bar{t}\gamma \gamma \) production at NLO+PS with GoSam interfaced to MadGraph5_aMC@NLO

Eur. Phys. J. C Spin polarisation of t t¯γ γ production at NLO+PS with GOSAM interfaced to MADGRAPH5_AMC@NLO Hans van Deurzen 2 Rikkert Frederix 1 Valentin Hirschi 0 Gionata Luisoni 2 Pierpaolo

Multi-leg one-loop massive amplitudes from integrand reduction via Laurent expansion

We present the application of a novel reduction technique for one-loop scattering amplitudes based on the combination of the integrand reduction and Laurent expansion. We describe the general features of its implementation in the computer code Ninja, and its interface to GoSam. We apply the new reduction to a series of selected processes involving massive particles, from six to...

GoSam-2.0: a tool for automated one-loop calculations within the Standard Model and beyond

We present the version 2.0 of the program package GoSam for the automated calculation of one-loop amplitudes. GoSam is devised to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The new code contains improvements in the generation and in the reduction of the amplitudes, performs better in computing time and...