7 research outputs found
Unexplained Excess of Electron-Like Events From a 1-GeV Neutrino Beam
The MiniBooNE Collaboration observes unexplained electron-like events in the
reconstructed neutrino energy range from 200 to 475 MeV. With protons on target, 544 electron-like events are observed in this
energy range, compared to an expectation of events,
corresponding to an excess of events. The shape of
the excess in several kinematic variables is consistent with being due to
either and charged-current scattering or to
neutral-current scattering with a photon in the final state. No significant
excess of events is observed in the reconstructed neutrino energy range from
475 to 1250 MeV, where 408 events are observed compared to an expectation of
events.Comment: Reduced length by 30 lines and made minor changes to reference
First Measurement of and Events in an Off-Axis Horn-Focused Neutrino Beam
We report the first observation of off-axis neutrino interactions in the
MiniBooNE detector from the NuMI beamline at Fermilab. The MiniBooNE detector
is located 745 m from the NuMI production target, at 110 mrad angle
() with respect to the NuMI beam axis. Samples of charged current
quasi-elastic and interactions are analyzed and found to be
in agreement with expectation. This provides a direct verification of the
expected pion and kaon contributions to the neutrino flux and validates the
modeling of the NuMI off-axis beam.Comment: 4 pages, 5 figures, Submitted to Phys. Rev. Let