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Consequences of a unified, anarchical model of fermion masses and mixings

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arxiv 0812.0087 v2 pith:OHIHRC65 submitted 2008-12-01 hep-ph

Consequences of a unified, anarchical model of fermion masses and mixings

classification hep-ph
keywords flavouralphacouplingdecayeffectsfeaturesfermionmodel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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