Observation of Muon Neutrino Disappearance with the MINOS Detectors in the NuMI Neutrino Beam

Creators: Michael, D. G.; Barish, B.; Choudhary, B. C.; Hanson, J.; Howcroft, C.; Kim, H.; Newman, H. B.; Ochoa-Ricoux, J. P.; Peck, C. W.; Smith, C.; Trevor, J.; Zheng, H.; MINOS Collaboration

Abstract

This Letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rates and energy spectra of charged current ν_μ interactions are compared in two detectors located along the beam axis at distances of 1 and 735 km. With 1.27×10^(20) 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of 336±14 events. The data are consistent with ν_μ disappearance via oscillations with Δm_(32)^2|=2.74_(-0.26)^(+0.44)×10^(-3) eV^2 and sin^2(2θ_(23))>0.87 (68% C.L.).

Additional Information

© 2006 The American Physical Society. Received 4 August 2006; published 8 November 2006. This work was supported by the U.S. DOE; the United Kingdom PPARC; the U.S. NSF; the State and University of Minnesota; the University of Athens, Greece; and Brazil's FAPESP and CNPq. We are grateful to the Minnesota Department of Natural Resources, the crew of the Soudan Underground Laboratory, and the staff of Fermilab for their contribution to this effort.

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