New Formula for the Cabibbo Angle and Composite Quarks and Leptons

Abstract

A composite model for quarks and leptons is proposed. An SU(3)-generation symmetry, which is badly broken not only by the generator ${F}_{8}$ but also by the generator ${F}_{3}$, is introduced. The model leads to a new formula for the Cabibbo angle ${\ensuremath{\theta}}_{\mathrm{C}}$ represented in terms of lepton masses, which predicts ${tan\ensuremath{\theta}}_{\mathrm{C}}=0.225$.