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We consider a U(1)$_X$ gauge symmetry extension of the Standard Model (SM)with a $Z^\prime$-portal Majorana fermion dark matter that allows for arelatively light gauge boson $Z^\prime$ with mass of 10 MeV$-$ a few GeV and amuch heavier dark matter through the freeze-in mechanism. In a second scenariothe roles are reversed, and the dark matter mass, in the keV range or so, lieswell below the $Z^\prime$ mass, say, $\sim 1$ GeV. We outline the parameterspace that can be explored for these two scenarios at the future LifetimeFrontier experiments including Belle-II, FASER, LDMX and SHiP.

Light $Z^\prime$ and Dark Matter from U(1)$_X$ Gauge Symmetry