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We discuss a model with a dark sector, in which smallness of mass for chargedleptons and neutrinos can naturally be explained by one-loop effects mediatedby particles in the dark sector. These new particles, including dark mattercandidates, also contribute to the anomalous magnetic dipole moment, denoted by$(g-2)$, for charged leptons. We show that our model can explain the muon$(g-2)$ anomaly and observed neutrino oscillations under the constraints fromlepton flavor violating decays of charged leptons. We illustrate that thescenario with scalar dark matter is highly constrained by direct searches atthe LHC, while that with fermionic dark matter allows for considering darkscalars with masses of order 100 GeV. Our scenario can be tested by a precisemeasurement of the muon Yukawa coupling as well as the direct production ofdark scalar bosons at future electron-positron colliders.

Dark Sector as Origin of Light Lepton Mass and Its Phenomenology