Sterile neutrino searches at tagged kaon beams

Tagged kaon beams are attractive neutrino sources, which would provide flavor pure nu(e) beams with exactly measured normalization. We point out that this also leads to an antitagged flavor pure nu(mu) beam, with equally well-known normalization. Exposing a 1 kt liquid argon detector at a baseline of 1 km to this combination of unique beams allows us to decisively test recent indications by IceCube and Neutrino-4 of sterile neutrino oscillations in the multi-eV range.