An interface between the Powheg Box and MadGraph5_aMC@NLO
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Special Article - Tools for Experiment and Theory
An interface between the Powheg Box and MadGraph5_aMC@NLO Paolo Nason1,2,a , Carlo Oleari1,2,b , Marco Rocco1,2,c , Marco Zaro3,d 1
Università di Milano-Bicocca, Piazza della Scienza 3, 20126 Milan, Italy INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, 20126 Milan, Italy 3 INFN, Sezione di Milano and TIFLab, Via Celoria 16, 20133 Milan, Italy
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Received: 28 August 2020 / Accepted: 15 October 2020 © The Author(s) 2020
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.
Contents 1 Introduction . . . . . . . . . . 2 Interface to MG5_aMC . . . . 2.1 Technical details . . . . . 2.2 Distribution of the code . . 3 A case study: X 0 j j production couplings . . . . . . . . . . . . 3.1 Theoretical setup . . . . . 3.2 Generation of the code . . 3.3 Simulation parameters . . 3.4 Phenomenology . . . . . . 3.5 Reweighting . . . . . . . . 3.6 MiNLO . . . . . . . . . . 4 Conclusions . . . . . . . . . . References . . . . . . . . . . . . .
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1 Introduction Next-to-leading-order (NLO) calculations for Standard Model (SM) and, sometimes, beyond-the-SM (BSM) processes, interfaced to parton shower (PS) generators, generally dubbed NLO+PS generators, are by now the methods of choice for the generation of event samples for signal and background processes at the LHC. This state of the art has been made possible, on the one side, by the formulations of general methods for computing NLO corrections [1,2], and, on the other, by the theoretical development of algorithms for interfacing fixed order calculations with parton shower generators [3–8]. These algorithms were implemented in software packages for the automatic computation of NLO corrections [9–13], and for the automatic implementation of NLO+PS generators [9,14–17] that considerably ease the construction of generators for new processes. MadGraph5_aMC@NLO, often abbreviated to MG5_aMC in the following, is a framework
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