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Search for supplementary Higgs Bosons at the LHC

Abstract : Despite its incontestable experimental success, the Standard Model of particle physics leaves unanswered many fundamental questions like the hierarchy problem and the origin of dark matter, motivating the study of physics beyond its scope. The NMSSM is a well-motivated extension of the SM addressing these two issues. It features a rich phenomenology accessible, in principle, at the LHC. In particular, the Higgs sector of the NMSSM is extended with respect to the SM giving rise to six scalars. It is the aim of this thesis to study the discovery potential of these extra Higgs bosons at the LHC. After introducing the NMSSM and its motivation, we first study the discovery prospects for a scalar lighter than the 125 GeV resonance found at CERN, reviewing its possible production and detection at the upcoming runs of the LHC and its possible impact on couplings of the Standard Model Higgs boson. Next, prospects for searches via Higgs cascades involving extra light and heavy Higgs bosons are presented. Detailed studies by means of Monte Carlo methods are performed, and new dedicated analysis are proposed. These last results are not confined to the NMSSM and can be interpreted in a wide class of models.
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Submitted on : Thursday, October 26, 2017 - 12:45:11 PM
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Matiás Rodríguez Vázquez. Search for supplementary Higgs Bosons at the LHC. High Energy Physics - Phenomenology [hep-ph]. Université Paris Saclay (COmUE), 2017. English. ⟨NNT : 2017SACLS317⟩. ⟨tel-01624482⟩

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