Violation de la saveur leptonique, Violation de CP et Signaux auprès des Collisionneurs : Complémentarité des recherches directes et indirectes de nouvelles échelles de Physique – LFV-CPV-LHC

The aim of the project is to study, within common theoretical frameworks, different phenomena Beyond the Standard Model of particle physics: Leptonic Flavour Violation (induced by neutrino mass matrices), CP Violation, and New Physics at colliders and precision experiments. Common theoretical frameworks are minimal and non-minimal supersymmetric extensions of the Standard Model and theories with extra dimensions of space-time., Already the present experimental data (as informations about neutrino masses, the presence of dark matter and te baryon asymmetry of the universe) show us that the so-called Standard Model of particle physics is incomplete. From the theoretical point of view, the Standard Model of particle physics leaves many questions open (as the origin of flavour and/or CP violation, the origin of different mass scales etc.). Many additional experimental results are expected in the following years, from colliders, especially LHC, neutrino experiments, ground based dark matter searches to observational astronomy and cosmology, which will require interpretations within models Beyond the Standard Model. The important point is that a given theoretical model for, e.g., CP violation, leads to observable consequences in very different domains as the baryon asymmetry of the universe, neutrino physics, B physics and Higgs physics at colliders. It is thus very important to unify experts from different domains, in order to investigate the phenomenological consequences of models for CP violation and flavour violation in theories like supersymmetry or extra dimensions. More precisely, the aim of the present project is to study i) the role of different lepton number violating higher dimensional operators (derived from different see-saw type mass matrices) for neutrino masses, present and future neutrino experiments, for CP violation and the resulting baryon asymetry of the universe via leptogenesis, and possible flavour violating processes at colliders; ii) explicit and spontaneous CP violation within minimal and non-minimal supersymmetric extensions of the standard model and its complementary effects on Higgs masses, couplings and signatures at colliders, B-physics and other low-energy observables as the baryon asymmetry and dark matter relic density of the universe; iii) the effect of different see-saw type leptonic mass matrices in supersymmetric theories and their effect on rare processes, as well the effect of R symmetry violating leptonic mass matrices in supersymmetric theories and their effect on searches for supersymmetric particles at colliders; iv) models for flavour violation (and the mass hierarchies between the different flavours) based in extra dimensions, and their predictions of new particles to be detected at colliders; v) consequences of future results (or constraints) on electric dipole moments of leptons, B--anti-B--oscillations and rare B decays, which are expected at Super-B-, Super-Flavour-Factories and the LHCb, have to be worked out and to be interpreted within the above scenarios. In each of these domains, at least one among the participants of the project is an experienced researcher in phenomenology, theory and/or experiment, and in close contact with other groups in France and world-wide. The results of the research project will made available to experimental and other theoretical research groups not only in the usual form of scientific papers and presentations at conferences and workshops, but also in the form of computer simulation codes and analysis programs on an already existing web site.