Decays in Flight of Heavy Sterile Neutrinos in the MiniBooNE Detector

Heavy sterile neutrinos in the O(10) MeV mass range would be produced in neutrino superbeams, from pion and kaon decays. In short-baseline experiments and for sufficiently long lifetimes, such steriles can propagate to the detector and decay to electrons or photons, leading to signatures which may be mis-identified for oscillation driven electron quasi-elastic charged current events. Some generic features of the production and decay of such steriles are mentioned, and the particular case study of the low energy excess at the MiniBooNE detector is studied for possible signals. We show that angular data heavily constraints the amount of events that could be from such decays to at most 50% of the excess.