An interface between the POWHEG BOX and MadGraph5_aMC@NLO

TL;DR

This paper introduces a framework integrating MadGraph5_aMC@NLO with the POWHEG BOX to facilitate the development of generators for complex Standard Model processes, enabling advanced features like multijet merging.

Contribution

It presents a novel interface that combines MadGraph5_aMC@NLO's matrix element generation with POWHEG BOX, allowing flexible and advanced event simulation capabilities.

Findings

Successfully developed a generator for Higgs-like boson production with up to two jets.

Demonstrated the use of the framework for processes with CP-violating couplings.

Enabled multijet merging without a merging scale using MiNLO.

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.