A Search for Muon-neutrino to Electron-neutrino and Muon-antineutrino to Electron-antineutrino Oscillations at NuTeV

Abstract

Limits on ${\nu }_{\mu }\to {\nu }_e$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ oscillations are extracted using the NuTeV detector with sign-selected ${\nu }_{\mu }$ and $\nub_μ$ beams. In $\nub_μ$ mode, for the case of ${\sin }^{2}2\alpha =1$, $\Delta m^2>2.6$ $\mathrm{e}{\mathrm{V}}^2$ is excluded, and for $\Delta m^2\gg 1000$ $\mathrm{e}{\mathrm{V}}^2$, ${\sin }^{2}2\alpha >1.1\times 10^{-3}$. The NuTeV data exclude the high $\Delta m^2$ end of ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_e$ oscillations parameters favored by the LSND experiment without the need to assume that the oscillation parameters for $\nu$ and $\nub$ are the same. We present the most stringent experimental limits for ${\nu }_{\mu }({\bar{\nu }}_{\mu })\to {\nu }_e({\bar{\nu }}_e)$ oscillations in the large $\Delta m^2$ region.

arXiv comment4 pages, 3 figures. Submitted to Phys. Rev. Letters, UR-1640

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