Fermion masses and mixings in gauge theories

Details Fermion masses and mixings in gauge theories Fermion masses and mixings in gauge theories

2001-05-14

arxiv.org/abs/hep-ph/0105124v2

Int.J.Mod.Phys.A17:3981-4006,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, RevTex, no figures. Few misprints corrected and two references added

Scientific paper

10.1142/S0217751X02011047

The recent evidence for neutrino oscillations stimulate us to discuss again the problem of fermion masses and mixings in gauge theories. In the standard model, several forms for quark mass matrices are equivalent. They become ansatze within most extensions of the standard model, where also relations between quark and lepton sectors may hold. In a seesaw framework, these relations can constrain the scale of heavy neutrino mass, which is often related to the scale of intermediate or unification gauge symmetry. As a consequence, two main scenarios arise. Hierarchies of masses and mixings may be explained by broken horizontal symmetries.

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