2012

A Three Higgs Doublet Model for the Fermion Mass Hierarchy Problem

Chao, Wei

Understand

In this paper we propose a possible explanation to the Fermion mass hierarchy problem by fitting the type-II seesaw mechanism into the Higgs doublet sector, such that their vacuum expectation values are hierarchal.

We extend the Standard Model with two extra Higgs doublets as well as a spontaneously broken $U_X(1)$ gauge symmetry.
All the fermion Yukawa couplings except that of top quark are of order ${\cal O} (10^{-2})$ in our model.
Constraints on the parameter space from Electroweak precision measurements are studied.

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