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We propose a new mechanism which simultaneously explains tiny neutrinomasses, stability of dark matter and baryon asymmetry of the Universe vialeptogenesis due to the common origin: a spontaneous breaking of a $U(1)_X$gauge symmetry at TeV scale. The $U(1)_X$ breaking provides small Majoranamasses of vector-like leptons which generate small mass differences among them,and enhance their CP-violating decays via the resonant effect. SuchCP-violation and lepton number violation turns out to be a sufficient amount ofthe observed baryon asymmetry through leptogenesis. The Majorana masses fromthe $U(1)_X$ breaking also induce radiative generation of masses for activeneutrinos at one-loop level. Furthermore, a $Z_2$ symmetry appears as a remnantof the $U(1)_X$ breaking, which guarantees the stability of dark matter. Weconstruct a simple renormalizable model to realize the above mechanism, andshow a benchmark point which can explain observed neutrino oscillations, darkmatter data and the baryon asymmetry at the same time.

Gauged $U(1)_X$ breaking as origin of neutrino masses, dark matter and leptogenesis at TeV scale