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Current data implies three simple forms of the neutrino mass matrix, eachcorresponding to the conservation of a non-standard lepton charge. While modelsbased on L_e and L_e - L_mu - L_tau are well-known, little attention has beenpaid to L_mu - L_tau. A low energy mass matrix conserving L_mu - L_tau impliesquasi-degenerate light neutrinos. Moreover, it is mu-tau symmetric andtherefore (in contrast to L_e and L_e - L_mu - L_tau) automatically predictsmaximal atmospheric neutrino mixing and zero U_{e3}. A see-saw model based onL_mu - L_tau is investigated and testable predictions for the neutrino mixingobservables are given. Renormalization group running below and in between thesee-saw scales is taken into account in our analysis, both numerically andanalytically.Comment: 15 pages, 2 figures. Prepared for 5th International Conference on  Nonaccelerator New Physics (NANP 05), Dubna, Russia, 20-25 Jun 200

Flavor symmetry L μ-L τ and quasidegenerate neutrinos