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Theses

Physique de la saveur au-delà du Modèle Standard et dimensions supplémentaires

Abstract : Even if the Standard Model (SM) of particle physics meets and extraordinary experimental success, some fundamental questions remain unanswered (origin of
hierarchies, observed mixing pattern in neutrino and quark sectors...). We need to go beyond the SM and to go beyond new principles/symmetries. The aim of this
thesis is to study phenomenologies of supersymmetric and/or extradimensional models and to look at deviations from the SM, in the flavour sector.
First, we adressed the question of baryon- and lepton-number conservation through R-parity in low-energy supersymmetric models. Precisely, we studied its violation using experimental data and the rare kaon decay K $\to \pi \nu\bar{\nu}$ derive
upper limits on R-parity violating couplings involved in it. In this context we have pointed out the importance of R-parity conserving contributions and their interferences with R-parity violating ones.
In the second part, we studied effects an extra dimension (space-like andcompactifed on several examples: quantum electrodynamics and unification neutrino masses and mixing angles.
Typically, adding an extra dimension reduces the predictive power. However, we are still able to know generic behaviours (order of magnitude predictions).
In particular, we pointed out the possibility of a weak neutrino mixing pattern (CKM-like) at high energy for a signicative and reasonable parameter space.
This opens up new perspectives in the study of flavour symmetries and bonds between quark and leptons.
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Julien Welzel. Physique de la saveur au-delà du Modèle Standard et dimensions supplémentaires. Physique mathématique [math-ph]. Université Claude Bernard - Lyon I, 2006. Français. ⟨tel-00175294⟩

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