Scotoseesaw model implied by dark right-handed neutrinos

We find a dark gauge symmetry U(1)(D) that transforms nontrivially only for three right-handed neutrinos, nu(1,2,3R). The anomaly cancellation demands that they have a dark charge D = 0, -1, 1 assigned to nu(1,2,3R), respectively. The dark charge is broken by two units down to a dark parity, i.e., U(1)(D) -> P-D = (-1)(D), which stabilizes a dark matter candidate. Interestingly, the model manifestly supplies neutrino masses via joint seesaw and scotogenic mechanisms, called scotoseesaw.