Predictions for the neutrino parameters in the minimal model extended by linear combination of U(1)Le-Lμ, U(1)Lμ-Lτ gauge symmetries

We study the minimal extensions of the Standard Model by a linear combination of U(1)Le-L mu, U(1)L mu-L tau and U(1)B-L gauge symmetries, where three right-handed neutrinos and one U(1)-breaking SU(2)L singlet or doublet scalar are introduced. Because of the dependence on the lepton flavor, the structures of both Dirac and Majorana mass matrices of neutrinos are restricted. In particular, the two-zero minor and texture structures in the mass matrix for the active neutrinos are interesting. Analyzing these structures, we obtain uniquely all the neutrino parameters, namely the Dirac CP phase delta, the Majorana CP phases alpha 2,3and the mass eigenvalues of the light neutrinos mi as functions of the neutrino mixing angles theta 12, theta 23, and theta 13, and the squared mass differences Delta m212 and Delta m312. In 7 minimal models which are consistent with the recent neutrino oscillation data, we also obtain the predictions for the sum of the neutrino masses sigma imiand the effective Majorana neutrino mass and compare them with the current experimental limits. In addition, we also discuss the implication of our results for leptogenesis.