S3 as a flavour symmetry for quarks and leptons after the Daya Bay result on θ13

Abstract

We present a model based on the flavour group S3 X Z3 X Z6 to explain the main features of fermion masses and mixing. In particular, in the neutrino sector the breaking of the S3 symmetry is responsible for a naturally small r=Δm^2_sol/Δm^2_atm and suitable next-to-leading order corrections bring θ13 at the level of ~ 0.13, fully compatible with the recent Daya Bay result. In the quark sector, the model accommodates the different mass hierarchies in the up and down quark sectors as well as the Cabibbo angle and Vcb (or Vub, depending on the charge assignment of the right-handed b-quark) in the correct range.

15 pages, 3 figures

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