A Search for Electron Antineutrino Appearance at the $\Delta m^2 \sim$ 1 $\mathrm{eV}^{2}$ Scale

Understand

The MiniBooNE Collaboration reports initial results from a search for $\bar{\nu}_{\mu}\to\bar{\nu}_e$ oscillations.

• A signal-blind analysis was performed using a data sample corresponding to $3.39 \times 10^{20}$ protons on target.
• The data are consistent with background prediction across the full range of neutrino energy reconstructed assuming quasielastic scattering, $200 < E_{\nu}^{QE} < 3000$ MeV: 144 electron-like events have been observed in this energy range, compared to an expectation of $139.2 \pm 17.6$ events.
• No significant excess of events has been observed, both at low energy, 200-475 MeV, and at high energy, 475-1250 MeV.