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We study $Z'$ phenomenology at hadron colliders in an $U(1)'$ extended MSSM.We choose a $U(1)'$ model with a secluded sector, where the tension between theelectroweak scale and developing a large enough mass for $Z'$ is resolved byincorporating three additional singlet superfields into the model. We perform adetailed analysis of the production, followed by decays, including intosupersymmetric particles, of a $Z'$ boson with mass between 4 and 5.2 TeV, withparticular emphasis on its possible discovery. We select three differentscenarios consistent with the latest available experimental data and relicdensity constraints, and concentrate on final signals with two leptons, fourleptons and six leptons. Including the SM background from processes with two,three or four vector bosons, we show the likelihood of observing a $Z^\prime$boson is not promising for the HL-LHC at 14 TeV. While at 27 and 100 TeV, thesituation is more optimistic, and we devise specific benchmark scenarios whichcould be observed.

Heavy $Z^\prime$ Bosons in the Secluded $U(1)^\prime$ Model at Hadron Colliders