New Physics from U(3)-Family Nonet Higgs Boson Scenario

Abstract

Being inspired by a phenomenological success of a charged lepton mass formula, a model with U(3)-family nonet Higgs bosons is proposed. Here, the Higgs bosons $\phi_L$ ($\phi_R$) couple only between light fermions (quarks and leptons) $f_L$ ($f_R$) and super-heavy vector-like fermions $F_R$ ($F_L$), so that the model leads to a seesaw-type mass matrix $M_f\simeq m_L M_F^{-1} m_R$ for quarks and leptons $f=u,d,\nu$ and $e$. Lower bounds of the physical Higgs boson masses are deduced from the present experimental data and possible new physics from the present scenario is speculated.