The authors compute the previously arbitrary Z-Z' kinetic and mass mixing at one loop in two L_mu-L_tau models, finding a suppressed mixing in a seesaw version and a non-decoupling mixing in a vectorlike-lepton version.
Discrete symmetries and models of flavor mixing
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abstract
Evidences of a discrete symmetry behind the pattern of lepton mixing are analyzed. The program of "symmetry building" is outlined. Generic features and problems of realization of this program in consistent gauge models are formulated. The key issues include the flavor symmetry breaking, connection of mixing and masses, {\it ad hoc} prescription of flavor charges, "missing" representations, existence of new particles, possible accidental character of the TBM mixing. Various ways are considered to extend the leptonic symmetries to the quark sector and to reconcile them with Grand Unification. In this connection the quark-lepton complementarity could be a viable alternative to TBM. Observational consequences of the symmetries and future experimental tests of their existence are discussed.
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Generalised $\mu$-$\tau$ symmetries and calculable gauge kinetic and mass mixing in $U(1)_{L_\mu-L_\tau}$ models
The authors compute the previously arbitrary Z-Z' kinetic and mass mixing at one loop in two L_mu-L_tau models, finding a suppressed mixing in a seesaw version and a non-decoupling mixing in a vectorlike-lepton version.