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We propose the first experimental test of the inelastic boosted dark matterhypothesis, capitalizing on the new physics potential with the imminent datataking of the ProtoDUNE detectors. More specifically, we explore variousexperimental signatures at the cosmic frontier, arising in boosted dark matterscenarios, i.e., relativistic, inelastic scattering of boosted dark matteroften created by the annihilation of its heavier component which usuallycomprises of the dominant relic abundance. Although features are unique enoughto isolate signal events from potential backgrounds, vetoing a vast amount ofcosmic background is rather challenging as the detectors are located on theground. We argue, with a careful estimate, that such backgrounds neverthelesscan be well under control by performing dedicated analyses after dataacquisition. We then discuss some phenomenological studies which can beachieved with ProtoDUNE, employing a dark photon scenario as our benchmarkdark-sector model.

Search for Boosted Dark Matter at ProtoDUNE