A Study of Muon Neutrino Disappearance Using the Fermilab Main Injector Neutrino Beam

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We report the results of a search for muon-neutrino disappearance by the Main Injector Neutrino Oscillation Search.

• The experiment uses two detectors separated by 734 km to observe a beam of neutrinos created by the Neutrinos at the Main Injector facility at Fermi National Accelerator Laboratory.
• The data were collected in the first 282 days of beam operations and correspond to an exposure of 1.27e20 protons on target.
• Based on measurements in the Near Detector, in the absence of neutrino oscillations we expected 336 +/- 14 muon-neutrino charged-current interactions at the Far Detector but observed 215.