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We propose a neutrinophilic two-Higgs-doublet model, where the vacuumexpectation value (VEV) of the second Higgs doublet is only induced at one-looplevel via several neutral fermions. Thus, the masses of active neutrinosarising from the Higgs doublets are naturally small via such a tiny VEV. Wediscuss various phenomenology of the model, including the neutrino masses andoscillations, bounds on non-unitarity, lepton-flavor violations, the obliqueparameters, the muon anomalous magnetic moment, the GeV-scale sterile neutrinocandidate arising from the tiny VEV, and collider signatures. We finallydiscuss the possibility of detecting the sterile neutrino suggested in theexperiment of Future Circular Collider (FCC).

Neutrinophilic two Higgs doublet model with $U(1)$ global symmetry