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In this work we analyse the ultimate sensitivity of dark matter directdetection experiments, the "neutrino-floor", in the presence of anomaloussources of dark radiation in form of SM or semi-sterile neutrinos. Thisflux-component is assumed to be produced from dark matter decay. Since darkradiation may mimic dark matter signals, we perform our analysis based onlikelihood statistics that allows to test the distinguishability betweensignals and backgrounds. We show that the neutrino floor for xenon-basedexperiments may be lifted in the presence of extra dark radiation. In addition,we explore the testability of neutrino dark radiation from dark matter decay indirect detection experiments. Given the previous bounds from neutrinoexperiments, we find that xenon-based dark matter searches will not be able toprobe new regions of the dark matter progenitor mass and lifetime parameterspace when the decay products are SM neutrinos. In turn, if the decay insteadhappens to a fourth neutrino species with enhanced interactions to baryons, DRcan either constitute the dominant background or a discoverable signal indirect detection experiments.

The neutrino-floor in the presence of dark radation