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We examine the observability of heavy neutrino (nu_h) signatures of a U(1)'enlarged Standard Model (SM) encompassing three heavy Majorana neutrinosalongside the known light neutrino states at the the Large Hadron Collider(LHC). We show that heavy neutrinos can be rather long-lived particlesproducing distinctive displaced vertices that can be accessed in the CERN LHCdetectors. We concentrate here on the gluon fusion production mechanism gg ->H_{1,2} -> nu_h nu_h, where H_1 is the discovered SM-like Higgs and H_2 is aheavier state, yielding displaced leptons following nu_h decays into weak gaugebosons. Using data collected by the end of the LHC Run 2, these signatureswould prove to be accessible with negligibly small background.

Novel SM-like Higgs decay into displaced heavy neutrino pairs in U(1)' models