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In our recent paper [1], we explored a prospect of discovering the heavyMajorana right-handed neutrinos (RHNs) at the future LHC in the context of theminimal non-exotic U(1) extended Standard Model (SM), where a pair of RHNs arecreated via decay of resonantly produced massive U(1) gauge boson($Z^{\prime}$). We pointed out that this model can yield a significantenhancement of the branching ratio of the $Z^\prime$ boson to a pair of RHNs,which is crucial for discovering the RHNs under the very severe LHC Run-2constraint from the search for the $Z^\prime$ boson with dilepton final states.In this paper, we perform a general parameter scan to evaluate the maximumproduction rate of the same-sign dilepton final states (smoking gun signatureof Majorana RHNs production) at the LHC, while reproducing the neutrinooscillation data. We also consider the minimal non-exotic U(1) model with analternative charge assignment. In this case, we find a further enhancement ofthe branching ratio of the $Z^\prime$ boson to a pair of RHNs compared to theconventional case, which opens up a possibility of discovering the RHNs evenbefore the $Z^\prime$ boson at the future LHC experiment.

Heavy Majorana neutrino pair productions at the LHC in minimal U(1) extended Standard Model