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Observation of muon neutrino disappearance with the MINOS detectors in the NuMI neutrino beam.

Journal article published in 2006 by D. G. Michael, D. G. Michael, P. Adamson, T. Alexopoulos, W. W. M. Allison, G. J. Alner, G. J. Alner, K. Anderson, C. Andreopoulos, M. Andrews, R. Andrews, K. E. Arms, K. E. Arms, R. Armstrong, C. Arroyo and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

This letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rate and energy spectra of charged current muon neutrino interactions are compared in two detectors located along the beam axis at distances of 1 km and 735 km. With 1.27 x 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 ± 14.4 events. The data are consistent with muon neutrino disappearance via oscillation with |Δ m^2_{23}| = 2.74^{+0.44}_{-0.26} x 10^{-3} eV^2/c^4 and sin^2(2\theta_{23}) > 0.87 (at 60% C.L.). ; Comment: To be submitted to PRL. 6 pages, 4 figures