Radiative neutrino model with semiannihilating dark matter

We propose a two-loop induced radiative neutrino model with hidden gauged $U(1)$ symmetry, in which dark matter of Dirac fermions arises. The relic density gets a contribution from annihilation and semiannihilation due to a residual ${\mathbb{Z}}_{3}$ parity. After imposing the requirement of neutrino oscillation data and lepton flavor violation bounds, we find that semiannihilation plays a crucial role in order to satisfy the relic density constraint $0.117l\mathrm{\ensuremath{\Omega}}{h}^{2}l0.123$, by proceeding near either one of two deconstructive scalar resonances. Our numerical analysis demonstrates the allowed region for the DM-scalar coupling with the DM mass in (80, 400) GeV.