First Measurement of $\nu_\mu$ and $\nu_e$ Events in an Off-Axis Horn-Focused Neutrino Beam

We report the first observation of off-axis neutrino interactions in the MiniBooNEdetector from the NuMI beamlineat Fermilab. The MiniBooNEdetector is located 745 m from the NuMIproduction target, at 110 mrad angle 6.3 degrees with respect to the NuMIbeam axis. Samples of charged currentquasi-elastic {nu}{sub {mu}} and {nu}{sub 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 NuMIoff-axis beam.