Fermion Generations from the Higgs Sector
Abstract
The generation structure in the quark and lepton spectrum is explained as originating from the excitation spectrum Sn of SU(2)W doublet scalar fields, whose ground state S1 is the Standard Model Higgs field. There is only one basic family of SU(2)W doublet left-handed fermions, nuL, eL, uL, dL, whose bound states with Sn manifest themselves as the generations of left-handed quarks and leptons. Likewise, there is only one basic family of the right-handed fermions, nuR, eR, uR, dR, which combine with the gauge invariant scalar fields Gn to produce the right-handed quarks and leptons of the second and higher generations. There are only four Yukawa coupling constants, Gnu, Ge, Gu, and Gd, and all quark and lepton masses are proportional to them. Suppression of flavor changing neutral currents (GIM mechanism) is automatic. numu and nutau are expected to be massive.
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