The E815 (NuTeV) neutrino experiment has performed a search for a 33. 9 MeV/c(2) weakly interacting neutral particle produced in pion decay. Such a particle may be responsible for an anomaly in the timing distribution of neutrino interactions in the KARMEN experiment. E815 has searched for this particle's decays in an instrumented decay region; no evidence for this particle was found. The search is sensitive to pion branching ratios as low as 10(-13).
We present sensitivities for the MiniBooNE experiment to a rare exotic pion decay producing a massive particle Q 0 . This type of decay represents one possible explanation for the timing anomaly reported by the KARMEN Collaboration. MiniBooNE will be able to explore a region of the KARMEN signal that has not yet been investigated.
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