Abstract
The minimal extension of the Weinberg-Salam theory satisfying left-right symmetry and quark-lepton unification is given by SU, (4) Q9 {SU L (2)Q9SU R (2)}. Its spontaneous breakdowns to SU, (3) Q9 {SU L(2)Q9U(1)} and then to SU,(3)Q9U,m (1) are ascribed to two Higgs multiplets. A relation between two mixing angles associated with these breakdowns is obtained. The mass scale of the first breakdown is estimated by the renormalization group method to be 10- GeV.
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