Search for ${\pi }^0\to {\nu }_{\mu }{\bar{\nu }}_{\mu }$ Decay in LSND

Abstract

We observe a net beam-excess of $8.7\pm 6.3$ (stat) $\pm 2.4$ (syst) events, above 160 MeV, resulting from the charged-current reaction of ${\nu }_{\mu }$ and/or ${\bar{\nu }}_{\mu }$ on C and H in the LSND detector. No beam related muon background is expected in this energy regime. Within an analysis framework of ${\pi }^0\to {\nu }_{\mu }{\bar{\nu }}_{\mu }$, we set a direct upper limit for this branching ratio of $\Gamma ({\pi }^0\to {\nu }_{\mu }{\bar{\nu }}_{\mu })/\Gamma ({\pi }^0\to all)<1.6\times 10^{-6}$ at 90% confidence level.

arXiv comment4 pages, 4 figures

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• The Liquid Scintillator Neutrino Detector and LAMPF Neutrino Source
• Measurements of Charged Current Reactions of muon neutrinos on C12

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