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

Source: [Improved search for $\\nu\_\\mu \\to \\nu\_e$ oscillation in a long-baseline accelerator experiment](<https://www.sota2.com/research/paper/68fa22627a2b558e2933b8bd>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T04:38:06.175Z

Authors: K2K collaboration: S.Yamamoto, et al

Published: 2006-03-02T06:59:30.000Z

## 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.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/hep-ex/0603004>)

[PDF](<https://arxiv.org/pdf/hep-ex/0603004.pdf>)