Abstract
In this paper we present a framework for developing Powheg Box generators using MadGraph5_aMC@NLO for the computation of the matrix elements. Within this framework, all the flexibility of MadGraph5_aMC@NLO for the generation of matrix elements for Standard Model processes and for several of its extensions can be exploited, as well as all features of the Powheg Box framework, including the possibility of multijet merging without a merging scale (using the so called MiNLO approach). As a proof of concept, we develop a generator for the production of a spin-0 Higgs-like boson in association with up to two jets, with CP-violating couplings.
Highlights
In this paper we present a framework for developing Powheg Box generators using MadGraph5_aMC@NLO for the computation of the matrix elements
All the flexibility of MadGraph5_aMC@NLO for the generation of matrix elements for Standard Model processes and for several of its extensions can be exploited, as well as all features of the Powheg Box framework, including the possibility of multijet merging without a merging scale
One can activate the MiNLO option for processes with associated jets, or use the damping option to separate the real contributions into two parts, along the lines of what was suggested in the original Powheg paper [4], and applied for the first time in Ref. [50]
Summary
The interface plugin, dubbed MG5aMC- PWG, is publicly available. Its usage is very simple, as one only needs to copy (or link) the MG5aMC_PWG folder inside the PLUGIN directory of MG5_aMC. During the execution of the generate command, the MG5aMC- PWG plugin checks whether an installation of the Powheg Box V2 is available on the system and asks for its installation path (this is needed only once). When this stage is concluded, the user can quit MG5_aMC and finds the MG5_aMC code for the Born, real and virtual contributions in the pp_ttx directory, in addition to a few basic Powheg Box V2 files. It is possible to assign a value to a MG5_aMC parameter at execution time An example of this can be found in the init_couplings.f file for the process X0 j j, that we discuss in Sect. One can activate the MiNLO option for processes with associated jets, or use the damping option to separate the real contributions into two parts, along the lines of what was suggested in the original Powheg paper [4], and applied for the first time in Ref. [50]
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