Abstract
The inert Zee model is an extension of the Zee model for neutrino masses to allow for a solution to the dark matter problem that involves two vector-like fields, a doublet and a singlet of SU(2)L, and two scalars, also a doublet and a singlet of SU(2)L, all of them being odd under an exact Z2 symmetry. The introduction of the Z2 guarantees one-loop neutrino masses, forbids tree-level Higgs-mediated flavor changing neutral currents and ensures the stability of the dark matter candidate. Due to the natural breaking of lepton numbers in the inert Zee model and encouraged by the ambitious experimental program designed to look for charged lepton flavor violation signals and the electron electric dipole moment, we study the phenomenology of the processes leading to these kind of signals, and establish which are the most promising experimental perspectives on that matter.
Highlights
JHEP10(2018)188 phenomena may have a common origin with a New Physics laying at the electroweak scale, as happens in the radiative neutrino mass models1 involving a dark matter candidate at or below the TeV scale [23,24,25,26,27,28,29]
Due to the natural breaking of lepton numbers in the inert Zee model and encouraged by the ambitious experimental program designed to look for charged lepton flavor violation signals and the electron electric dipole moment, we study the phenomenology of the processes leading to these kind of signals, and establish which are the most promising experimental perspectives on that matter
Since the Yukawa couplings that reproduce the neutrino oscillation data are complex, which in turn constitute new sources of CP violation, we will look into the regions in the parameter space where the prospects for the eEDM are within the future experimental sensitivity [17,18,19]
Summary
All of them are odd under the Z2 symmetry, which in turn allows us to avoid Higgs-mediated flavor changing neutral currents at treelevel, forbid tree-level contributions to the neutrino masses and render the lightest Z2-odd particle stable [54] It follows that the most general Z2-invariant Lagrangian of the model can be written as LIZM = LSM + LF + LS + L1 + L2,. Since in the latter regime the CLFV processes are quite suppressed (the corresponding rates scale as m−χω or m−κβ4), in our numerical analysis we will only consider the low mass regime In this model the neutrino masses are generated at one-loop thanks to the scalar and fermion mixings and to the Yukawa interactions mediated by ηi and fi. It is always possible to correctly reproduce the neutrino oscillation parameters in the present model.
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