Status | Confirmed |
Seminar Series | SOUTEN-TH |
Subjects | hep-ph |
Date | Thursday 28 September 2017 |
Time | 14:00 |
Institute | LPT |
Seminar Room | amphi 1, bat 210, 2eme etage |
Speaker's Last Name | Rodriguez |
Speaker's First Name | Mattias |
Speaker's Email Address | matias [dot] rodriguez-vazquez [at] th [dot] u-psud [dot] fr |
Speaker's Institution | LPT Orsay, LAPTH Annecy |
Title | La recherche de bosons de Higgs supplémentaires au LHC/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. Malgr´e un succ`es exp´erimental incontestable, le Mod`ele standard (MS) de la physique des particules laisse de nombreuses questions fondamentales sans r´eponse, comme le probl`eme de hi´erarchie et lorigine de la mati`ere noire, motivant l´etude de la nouvelle physique. Le Next-to- Minimal Supersymmetric Standard Model (NMSSM) est une extension tr`es int´eressante du MS r´epondant `a ces deux probl`emes. Il comprend une riche ph´enom´enologie, en principe accessible au Grand Collisionneur de Hadrons (LHC). En particulier, son secteur de Higgs est ´etendu par rapport au MS, g´en´erant six scalaires. Le but de cette th`ese est d´etudier le potentiel de d´ecouverte de ces bosons de Higgs suppl´ementaires au LHC. Apr`es une introduction du NMSSM et de ses motivations, nous ´etudions dabord les perspectives de d´ecouverte dun scalaire, plus l´eger que la r´esonance `a 125 GeV mise en ´evidence au CERN, en passant en revue ses possibles modes de production et de d´etection dans les phases `a venir du LHC, et ses possibles impacts sur les couplages du boson de Higgs du MS. Ensuite, les perspectives de recherche via les cascades de Higgs, impliquant des bosons de Higgs suppl´ementaires l´egers et lourds, est pr´esent´ee. Des ´etudes d´etaill´ees au moyen de m´ethodes Monte-Carlo ont ´et´e r´ealis´ees, et de nouvelles analyses d´edi´ees sont pr´esent´ees. Ces derniers r´esultats ne sont pas restreints au NMSSM, et peuvent etre interpr´et´es dans une large classe de mod`eles. |
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