An SU(3) scheme for leptons. Pt. II. Nonet case and extension to quarks

A systematic analysis of the lepton mass spectrum is presented in the framework of a spontaneous symmetry breaking, with leptons and Higgs particles associated with nonets of SU(3). We find solution with all known leptons in the same representation, whose most remarkable feature is the presence of a neutral lepton at about the tau lepton mass (1.8 GeV). Other leptons are also predicted, one charged and two additional neutrals, which can have a mass large enough to prevent their observation at present available accelerator energies. If #betta#sub(e) and #betta#sub(u) are both massive then #betta#sub(tau) should be an admixture of them. #betta#-oscillations can be accounted for in this model even in the case of massless #betta#sub(e) and #betta#sub(u). A direct extension to quarks is proposed. (author)