We present an interface between the multipurpose Monte Carlo toolMadGraph5_aMC@NLOand the automated amplitude generator GoSam. As a first application of this novel framework, we compute the NLO corrections topp→t ̄tHandpp→t ̄tγγmatched to a parton shower. In the phenomenological analyses of these processes, we focus our attention on observables which are sensitive to the polarisation of the top quarks.
Deurzen, Hans van; Frederix, Rikkert; Hirschi, Valentin; Luisoni, Gionata; Mastrolia, Pierpaolo; and Ossola, Giovanni, "Spin polarisation oft ̄tγγproduction at NLO+PS with GOSAM interfaced to MADGRAPH5_AMC@NLO" (2016). CUNY Academic Works.