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The MiniBooNE collaboration has reported an excess of $460.5\pm 95.8$electron-like events ($4.8\sigma$). We propose an explanation of these eventsin terms of a sterile neutrino decaying into a photon and a light neutrino. Thesterile neutrino has a mass around 250 MeV and it is produced from kaon decaysin the proton beam target via mixing with the muon or the electron in the range$10^{-11} \lesssim |U_{\ell 4}|^2 \lesssim 10^{-7}$ ($\ell = e,\mu$). The modelcan be tested by considering the time distribution of the events in MiniBooNEand by looking for single-photon events in running or upcoming neutrinoexperiments, in particular by the suite of liquid argon detectors in theshort-baseline neutrino program at Fermilab.

Explaining the MiniBooNE excess by a decaying sterile neutrino with mass in the 250 MeV range