Improved Search for $ν_{μ} \to ν_{e}$ Oscillation in a Long-Baseline Accelerator Experiment

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12 May 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 96 (18) , 181801
https://doi.org/10.1103/physrevlett.96.181801

Abstract

We performed an improved search for

ν_{μ} \to ν_{e}

oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of

9.2 \times 10^{19}

protons on target. No evidence for a

ν_{e}

appearance signal was found, and we set bounds on the

ν_{μ} \to ν_{e}

oscillation parameters. At

Δ m^{2} = 2.8 \times 10^{- 3} {eV}^{2}

, the best-fit value of the K2K

ν_{μ}

disappearance analysis, we set an upper limit of

{sin ﻿}^{2} 2 θ_{μ e} < 0.13

at a 90% confidence level.

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