Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-04-13
LAP LAMBERT Academic Publishing (2010); ISBN-13: 978-3838388533
Physics
High Energy Physics
High Energy Physics - Phenomenology
Doctoral thesis, 205 pages; Winner of the "Sergio Fubini" prize for the year 2010, lavished by the INFN - Istituto Nazionale d
Scientific paper
The flavour puzzle is an open problem both in the Standard Model and in its possible supersymmetric or grand unified extensions. In this thesis, we discuss possible explanations of the origin of fermion mass hierarchies and mixings by the use of non-Abelian discrete flavour symmetries. We present a T'- and an S4-based realisations in which the spontaneous breaking of the symmetry produces realistic fermion mass hierarchies, the quark mixing matrix comparable to the Wolfenstein parametrisation and the lepton mixing matrix close to the so-called tribimaximal pattern. We also present an alternative S4-based flavour model which naturally leads to the weak complementarity relation with a relatively large lepton reactor angle. Masses and mixings are evaluated at a very high energy scale and for a comparison with experimental measurements we illustrate a general analysis on the stability under the renormalisation group running to evolve these observables to low energies. We consider also the constraints on flavour violating processes arising from introducing a flavour symmetry: in particular we concentrate on the lepton sector, analysing some lepton flavour violating decays and the discrepancy between the theoretical prediction and the experimental measurement of the anomalous magnetic moment of the muon. Interesting hints for the scale of New Physics and for the forthcoming experimental results from LHC are found. Finally we discuss the impact of an underlining flavour symmetry on leptogenesis in order to explain the baryon asymmetry of the universe.
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