First Measurement of ${\nu }_{\mu }$ and ${\nu }_e$ Events in an Off-Axis Horn-Focused Neutrino Beam

Abstract

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 ($6.3^{\circ }$) with respect to the NuMI beam axis. Samples of charged current quasi-elastic ${\nu }_{\mu }$ and ${\nu }_e$ 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.

4 pages, 5 figures, Submitted to Phys. Rev. Lett

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