Abstract
We present an interface between the multipurpose NLO Monte Carlo tool MadGraph5_aMC@NLO and the automated one-loop amplitude generator GoSam. As a first application of this novel framework, we compute the NLO corrections to $pp \to t\bar{t}H$ and $pp \to t\bar{t}\gamma\gamma$ matched 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.
Highlights
Advanced automated calculations have been performed by embedding the codes for generating virtual corrections at NLO precision, the so called One Loop Providers (OLPs), within a Monte Carlo program (MC)
We present an interface between the multipurpose Monte Carlo tool MadGraph5_aMC@NLO and the automated amplitude generator GoSam
With these goals in mind, we present the interface between the multipurpose NLO Monte Carlo tool MadGraph5_aMC@NLO(MG5_aMC) [27] and the automated one-loop amplitude generator GoSam [20]
Summary
Advanced automated calculations have been performed by embedding the codes for generating virtual corrections at NLO precision, the so called One Loop Providers (OLPs), within a Monte Carlo program (MC). It is important to be able to connect different tools to increase the reliability of the results With these goals in mind, we present the interface between the multipurpose NLO Monte Carlo tool MadGraph5_aMC@NLO(MG5_aMC) [27] and the automated one-loop amplitude generator GoSam [20]. GoSam is interfaced to several MCs codes, like Sherpa [21], Herwig++ [26], Powheg [25], beside MG5_aMC, the user of the MCs can explore and compare the different features of the event generators, without being biased by the performances of the OLPs, since they all can be run using GoSam. As an illustration of the novel framework MG5_aMC + GoSam, we present its application to the NLO corrections to pp → ttH , H → γ γ and the continuum pp → ttγ γ matched to a parton shower.
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