Search for π⁰ to ν_{μ}barν_{μ} Decay in LSND

L.B. Auerbach , R.L. Burman , D.O. Caldwell , E.D. Church , A.K. Cochran , J.B. Donahue , A.R. Fazely , G.T. Garvey

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R.M. Gunasingha R.L. Imlay G. Kahrimanis W.C. Louis R. Majkic A. Malik K.L. McIlhany W.J. Metcalf G.B. Mills D. Rupnik V.D. Sandberg D. Smith R.F. Somodi I. Stancu W.D. Strossman M. Sung R. Tayloe G.J. VanDalen W. Vernon N. Wadia D.H. White S. Yellin H. Yi

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classification ✦ hep-ex

keywords gammalsndaboveanalysisbackgroundbeambeam-excessbranching

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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.

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Search for π⁰ to ν_{μ}barν_{μ} Decay in LSND

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