A New Approach to the Family Structure

Original · EN

In this letter, we introduce a new approach to formulate the family structure of the standard model. Trying to mimic the highly contrained representation structure of the standard model while extending the symmetry, we propose a SU(4)⊗ SU(3)⊗ SU(2)⊗ U(1) symmetry with a SM-like chiral spectra basically "derived" from the gauge anomaly constraints. Embedding the SM leads to SU(4)ₐ⊗ SU(3)C⊗ SU(2)ₗ⊗ U(1)ₓ models, which upon the SU(4)ₐ⊗ U(1)ₓ U(1)Y symmetry breaking, gives the three families naturally as a result. A specific model obtained from the approach is illustrated. The model, or others from our approach, holds promise of a very interesting phenomenology. We sketch some of the results here. An interesting possiblity of supersymmetrizing the model with the EW-Higgses already in the spectrum is noted. A comparison with other approaches is also discussed.