Improved search for $ν_μ\to ν_e$ oscillation in a long-baseline accelerator experiment

Details Improved search for $ν_μ\to ν_e$ oscillation in a long-baseline accelerator experiment Improved search for $ν_μ\to ν_e$ oscillation in a long-baseline accelerator experiment

2006-03-02

arxiv.org/abs/hep-ex/0603004v2

Phys.Rev.Lett.96:181801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.96.181801

We performed an improved search for $\nu_\mu \to \nu_e$ oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of $9.2 \times 10^{19}$\xspace protons on target. No evidence for a $\nu_e$ appearance signal was found, and we set bounds on the $\nu_\mu \to \nu_e$ oscillation parameters. At $\Delta m^2$ = $2.8 \times 10^{-3} \mathrm{eV}^2$, the best fit value of the K2K $\nu_\mu$ disappearance analysis, we set an upper limit of $\sin^2 2\theta_{\mu e}$ $<$ 0.13 at 90% confidence level.

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