Abstract
A mechanism to generate flavour hierarchy via five dimensional wave-function localization is revisited in the context of an SO(10) grand unified theory. An extra dimension compactified on an orbifold together with SO(10) breaking generates different profiles for massless modes of fermions of different charges. Utilizing a suitable scalar content, a predictive model of fermion masses and mixing is constructed and shown to be viable with the current data through a detailed numerical analysis. All the Yukawa couplings in the model are of order unity while the hierarchies among different fermions result from the wave-function profiles. The naturalness of anarchical Yukawa couplings is studied and the predictions for various observables in the lepton sector are derived. The scalar field content of the model is suitable to solve the doublet-triplet splitting problem through the missing partner mechanism.
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