Quark and lepton masses from a U(1) x Z(2) flavor symmetry

초록

We show that solutions fur the masses and mixings of the quarks and leptons based on a U(1) x Z(2) horizontal symmetry are possible. The seesaw mechanism is shown to work consistently in the presence of the discrete symmetry. The discrete symmetry results in the phenomenologically useful suppressions of elements of the Yukawa matrices. The quark and lepton masses, the CKM mixing angles, and the neutrino mixing angles are accommodated at the order of magnitude level.

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