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Although weakly interacting massive particles (WIMPs) have long been amongthe most studied and theoretically attractive classes of candidates for thedark matter of our universe, the lack of their detection in direct detectionand collider experiments has begun to dampen enthusiasm for this paradigm. Inthis study, we set out to appraise the status of the WIMP paradigm, focusing onthe case of dark matter candidates that interact with the Standard Modelthrough a new gauge boson. After considering a wide range of $Z'$ mediated darkmatter models, we quantitatively evaluate the fraction of the parameter spacethat has been excluded by existing experiments, and that is projected to fallwithin the reach of future direct detection experiments. Despite the existenceof stringent constraints, we find that a sizable fraction of this parameterspace remains viable. More specifically, if the dark matter is a Majoranafermion, we find that an order one fraction of the parameter space is in manycases untested by current experiments. Future direct detection experiments withsensitivity near the irreducible neutrino floor will be able to test asignificant fraction of the currently viable parameter space, providingconsiderable motivation for the next generation of direct detectionexperiments.

$Z'$ Mediated WIMPs: Dead, Dying, or Soon to be Detected?