Global ETD Search

1	A two-Higgs-doublet model : from twisted theory to LHC phenomenology Herquet, Michel 12 September 2008 (has links) At the dawn of the Large Hadron Collider era, the Brout-Englert-Higgs mechanism remains the most appealing theoretical explanation of the electroweak symmetry breaking, despite the fact that the associated fundamental scalar boson has escaped any direct detection attempt. In this thesis, we consider a particular extension of the minimal Brout-Englert-Higgs scalar sector implemented in the Standard Model of strong and electroweak interactions. This extension, which is a specific, "twisted", realisation of the generic two-Higgs-doublet model, is motivated by a relative phase in the definition of the phenomenologically successful CP and custodial symmetries. Considering extensively various theoretical, indirect and direct constraints, this model appears as a viable alternative to more conventional scenarios like supersymmetric models, and gives grounds to largely unexplored possibilities of exotic scalar signatures at present and future collider experiments. Collider phenomenology Custodial symmetry Higgs mechanism High energy physics
2	A two-Higgs-doublet model : from twisted theory to LHC phenomenology Herquet, Michel 12 September 2008 (has links) At the dawn of the Large Hadron Collider era, the Brout-Englert-Higgs mechanism remains the most appealing theoretical explanation of the electroweak symmetry breaking, despite the fact that the associated fundamental scalar boson has escaped any direct detection attempt. In this thesis, we consider a particular extension of the minimal Brout-Englert-Higgs scalar sector implemented in the Standard Model of strong and electroweak interactions. This extension, which is a specific, "twisted", realisation of the generic two-Higgs-doublet model, is motivated by a relative phase in the definition of the phenomenologically successful CP and custodial symmetries. Considering extensively various theoretical, indirect and direct constraints, this model appears as a viable alternative to more conventional scenarios like supersymmetric models, and gives grounds to largely unexplored possibilities of exotic scalar signatures at present and future collider experiments. Collider phenomenology Custodial symmetry Higgs mechanism High energy physics
3	Phenomenological Studies on Composite Higgs Models El Faham, Hesham January 2018 (has links) Composite Higgs Models (CHMs) are formulated in terms of strongly coupled theories. They often predict fermionic top partners with a mass around the TeV scale. Going beyond minimality enriches the spectrum of the theory with additional hypothetical scalars that significantly change the phenomenology. In this thesis, we explore an SO(6)/SO(5) CHM with an additional pseudo-scalar custodial singlet. The latter has anomalous couplings to the Standard Model vector bosons. We study the phenomenology of the singlet, including bounds from the available ATLAS and CMS searches in the relevant channels with di-boson and fermionic final states. We used HiggsBounds tool to test the model theoretical predictions against the current exclusion limits. The study is performed at the 8 and 13 TeV experiments at the LHC. We present a model parameter space from which the bounds on the (most sensitive) signal cross sections of the hypothetical singlet can be easily extracted. Composite Higgs Hierarchy problem Top partners Custodial symmetry Phenomenology Subatomic Physics Subatomär fysik
4	Recherche d’un boson de Higgs doublement chargé par diffusion de bosons vectoriels à désintégration leptonique dans le modèle de Georgi-Machacek avec le détecteur ATLAS au LHC Claude, Jérôme 08 1900 (has links) No description available. Physique des particules ATLAS Collisionneurs hadroniques Boson de Higgs Modèle de Georgi-Machacek Leptons de même charge VBS VBF Symétrie custodiale Analyse multi-variée Particle physics Hadronic colliders Higgs boson Georgi-Machacek model Same-sign leptons Custodial symmetry Multivariate analysis

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