Search for $π^0 \to ν_μ\barν_μ$ Decay in LSND

Details Search for $π^0 \to ν_μ\barν_μ$ Decay in LSND Search for $π^0 \to ν_μ\barν_μ$ Decay in LSND

2003-10-30

arxiv.org/abs/hep-ex/0310060v1

Phys.Rev.Lett.92:091801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.091801

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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