Abstract
We study a simple extension of the Zee model, in which a discrete Z2 symmetry imposed in the original model is replaced by a global U(1) symmetry retaining the same particle content. Due to the U(1) symmetry with flavor dependent charge assignments, the lepton sector has an additional source of flavor violating Yukawa interactions with a controllable structure, while the quark sector does not at tree level. We show that current neutrino oscillation data can be explained under constraints from lepton flavor violating decays of charged leptons in a successful charge assignment of the U(1) symmetry. In such scenario, we find a characteristic pattern of lepton flavor violating decays of additional Higgs bosons, which can be a smoking gun signature at collider experiments.
Highlights
As an alternative scenario, so-called radiative neutrino mass models can naturally explain tiny neutrino masses without introducing super heavy particles thanks to loop suppression factors
We study a simple extension of the Zee model, in which a discrete Z2 symmetry imposed in the original model is replaced by a global U(1) symmetry retaining the same particle content
We have discussed the simple extension of the Zee model, in which only the change is the replacement of a discrete Z2 symmetry by a flavor dependent global U(1) symmetry
Summary
Majorana masses for left-handed neutrinos are generated from the one-loop diagram as depicted in figure 1. (3.1)–(3.3) we obtain the predictions of three neutrino mixing angles θ12, θ23 and θ13 and three mass eigenvalues mi. In Class I of the U(1) charge assignment defined in appendix A, we take the following 11 independent parameters as inputs θL12,R, θL23,R, θL13,R, F12, F23, F13, tan β, Cν. We verify that even if we take full 3 × 3 matrix elements in F, i.e, three independent nonzero elements, we cannot obtain the solution This could be understood by the following way. In Class I, the tan β or cot β factor appears in a mixed way, while in Class II either the tan β or cot β factor appears in each column This characteristic distribution of the tan β dependence might be disfavored to explain the neutrino data in Class II. We take Class I of the U(1) charge assignment in what follows
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