Monte-Carlo event generation for a two-Higgs-doublet model with maximal CP symmetry

TL;DR

This paper implements a two-Higgs-doublet model with maximal CP symmetry into MadGraph, enabling simulation of its processes for experimental comparison, and explores its potential signatures at the LHC.

Contribution

The first implementation of the MCPM into MadGraph allows detailed simulation and analysis of its unique Higgs signatures for collider experiments.

Findings

Validated the MCPM implementation in MadGraph

Compared MCPM signals with SM background

Indicated potential for LHC to test the model

Abstract

Recently a two-Higgs-doublet model with maximal symmetry under generalised CP transformations, the MCPM, has been proposed. The theory features a unique fermion mass spectrum which, although not describing nature precisely, provides a good approximation. It also predicts the existence of five Higgs bosons with a particular signature. In this thesis I implemented the MCPM into the Monte-Carlo event generation package MadGraph, allowing the simulation of any MCPM tree-level process. The generated events are in a standardised format and can be used for further analysis with tools such as PYTHIA or GEANT, eventually leading to the comparison with experimental data and the exclusion or discovery of the theory. The implementation was successfully validated in different ways. It was then used for a first comparison of the MCPM signal events with the SM background and previous searches for new physics, hinting that the data expected at the LHC in the next years might provide exclusion limits or show signatures of this model.