Electron-muon mass ratio,neutrino masses and Weinberg angle in an approximate SU(4)+ ⊗ SU(4)− symmetry for leptons

Assuming an SU(4) group for leptons together with the dynamical equation $\text{P}{}_{\mathrm{z}}\text{{z ? z} = 0}$ ($\text{P}{}_{\mathrm{z}}$ is the projection of the representation z from the direct product z ? z) for the symmetry breaking, we predict: and a Weinberg angle $\text{sin}{}^2\text{θ}{}_{\mathrm{<mtext>w</mtext>}}\text{=}\text{1}\text{4}$.