R. Imlay

A Search for Electron Antineutrino Appearance at the

The MiniBooNE Collaboration reports initial results from a search for

\Delta m^2 \sim

bar{nu}_{mu}tobar{nu}_e

1

oscillations. A signal-blind analysis was performed using a data sample corresponding to

\mathrm{eV}^{2}

3.39 times 10^{20}

Scale

protons on target. The data are consistent with background prediction across the full range of neutrino energy reconstructed assuming quasielastic scattering,

Observation of a New Process with Trimuon Production by High-Energy Neutrinos

200<E_{nu}^{QE}<3000

Characteristics of Neutrino Produced Dimuon and Trimuon Events as Evidence for New Physics at the Lepton Vertex

MeV: 144 electron-like events have been observed in this energy range, compared to an expectation of

Rates and properties of opposite-sign dimuons from neutrinos and antineutrinos

139.2 pm 17.6

Evidence for the production of prompt like-sign dimuon events by high-energy neutrinos

events. No significant excess of events has been observed, both at low energy, 200-475 MeV, and at high energy, 475-1250 MeV. The data are inconclusive with respect to antineutrino oscillations suggested by data from the Liquid Scintillator Neutrino Detector at Los Alamos National Laboratory.