HAL : in2p3-00189774, version 1
 arXiv : 0711.3376
 Physics Letters B 663 (2008) 73-79
 Solving the flavour problem with hierarchical fermion wave functions
 (2008)
 We investigate the flavour structure of generic extensions of the SM where quark and lepton mass hierarchies and the suppression of flavour-changing transitions originate only by the normalization constants of the fermion kinetic terms. We show that in such scenarios the contributions to quark FCNC transitions from dimension-six effective operators are sufficiently suppressed without (or with modest) fine tuning in the effective scale of new physics. The most serious challenge to this type of scenarios appears in the lepton sector, thanks to the stringent bounds on LFV. The phenomenological consequences of this scenarios in view of improved experimental data on quark and lepton FCNC transitions, and its differences with respect to the Minimal Flavour Violation hypothesis are also discussed.
 Thème(s) : Physique/Physique des Hautes Energies - Phénoménologie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0711.3376
 in2p3-00189774, version 1 http://hal.in2p3.fr/in2p3-00189774 oai:hal.in2p3.fr:in2p3-00189774 Contributeur : Dominique Girod <> Soumis le : Jeudi 22 Novembre 2007, 10:13:08 Dernière modification le : Mardi 8 Juillet 2008, 10:56:09