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Dimension spatiale supplémentaire compactifiée et champ de Higgs branaire

Abstract : Among the motivations for a theory beyond the Standard Model (SM) of particle physics, the existence of new scales above the TeV implies the question of the stability of the electroweak scale with respect to radiative corrections to the Higgs boson mass. An attractive way to protect the electroweak scale is to build scenarii with q Spacelike Extra Dimensions (SED) compactified on a torus where the (4+q)D gravity scale is reduced to the TeV, through a large compactified volume, and acts as a cut-off for the SM. These models suffer from a problem of stabilization of the large compactification radii. Within the other paradigm with a small warped SED, the Higgs field is in general localized at a boundary of the SED (TeV-brane) where the gravity scale is redshifted to the TeV by a warp factor. If the SM gauge bosons and fermions propagate into the warped SED, one can generate the mass hierarchy for fermions. It is thus crucial to treat carefully the TeV-brane localized masses for such fermions, which is done in the literature by applying a regularization process suffering from a lack of consistency and more importantly being useless, as we demonstrate in detail in the present thesis. The first part of the thesis is devoted to the treatment of brane localized mass terms for 5D fermions, which requires the introduction of new Lagrangian terms at the SED boundaries, similar to the Gibbons-Hawking terms in gravity. The second part consists in applying different methods (function/distribution fields, 4D/5D calculations, etc) to various brane localized terms (kinetic terms, Majorana masses, etc), as well as a generalization to several classified models (flat/warped dimensions, intervalle/orbifold, etc). In the third part, we propose to compactify a flat SED on a star/rose graph with a large number of identical small leaves/petals. We obtain a compactified space with a large volume without a large compactification length to stabilize. We use the approach of 5D fermions to build a toy model of small Dirac neutrino masses (brane localized left-handed neutrinos and bulk right-handed ones).
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Florian Nortier. Dimension spatiale supplémentaire compactifiée et champ de Higgs branaire. Physique des Hautes Energies - Théorie [hep-th]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASS070⟩. ⟨tel-02976693⟩

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