Improved search for ${\nu }_{\mu }\to {\nu }_e$ oscillation in a long-baseline accelerator experiment

Abstract

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.

5 pages, 2 figures

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