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 ${\varphi }_L$ (${\varphi }_R$) 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.

Comments: 10 pages, LaTex, includes a LaTex figure, Talk at presented at the INS Workshop ``Physics of $e^{+}{e}^{-}$, $e^{-}\gamma$ and $\gamma \gamma$ collisions at linear accelerators", INS, University of Tokyo, December 20 -- 22, 1995.