Abstract
We propose a realistic theory of fermion masses and mixings using a five-dimensional warped scenario where all fermions propagate in the bulk and the Higgs field is localized on the IR brane. The assumed $T'$ flavor symmetry is broken on the branes by flavon fields, providing a consistent scenario where fermion mass hierarchies arise from adequate choices of the bulk mass parameters, while quark and lepton mixing angles are restricted by the family symmetry. Neutrino mass splittings, mixing parameters and the Dirac CP phase all arise from the type-I seesaw mechanism and are tightly correlated, leading to predictions for the neutrino oscillation parameters, as well as expected \znbb decay rates within reach of upcoming experiments. The scheme also provides a good global description of flavor observables in the quark sector.
Highlights
Understanding flavor from first principles is one of the greatest challenges in particle physics
We propose a realistic theory of fermion masses and mixings using a five-dimensional warped scenario where all fermions propagate in the bulk and the Higgs field is localized on the IR brane
The assumed T0 flavor symmetry is broken on the branes by flavon fields, providing a consistent scenario where fermion mass hierarchies arise from adequate choices of the bulk mass parameters, while quark and lepton mixing angles are restricted by the family symmetry
Summary
Understanding flavor from first principles is one of the greatest challenges in particle physics. We assume the standard model fermions to propagate in the bulk, though peaked towards either brane This allows us to address at once both aspects of the flavor problem: the fermion mass hierarchy problem, as well as their mixing pattern, with the help of a family symmetry group. This follows the general approach suggested in Ref. The 5D profiles of fields are presented in Appendix B, while, in Appendix C, we investigate the vacuum alignment of the flavon fields
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