Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-01
JHEP 0903:031,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 6 figures, text and reference added
Scientific paper
10.1088/1126-6708/2009/03/031
We show that most features of the mass and mixing pattern of the second and third SM fermion families can be accounted for without making use of flavour symmetries or other types of flavour dynamics. We discuss the implications for flavour phenomenology, in particular for the $\tau\to\mu\gamma$ decay rate, and comment on LFV effects at colliders. We show that the model can be embedded in a full SO(10) supersymmetric GUT in 5 dimensions that preserves the successful MSSM gauge coupling unification prediction for $\alpha_s$. Interesting features of this embedding are i) the connection of one of the hierarchy parameters with the strong coupling assumption, ii) the absence of KK threshold effects on the $\alpha_s$ prediction at one loop, and iii) the shift of the GUT scale up to about $10^{17}\GeV$. Proton decay is under control, also due to the larger GUT scale. A large atmospheric angle for normal hierarchical neutrinos is obtained in an unusual way.
Calibbi Lorenzo
Ferretti Luca
Romanino Andrea
Ziegler Robert
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