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

D. G. Michael et al. (MINOS Collaboration)
Phys. Rev. Lett. 97, 191801 – Published 8 November 2006

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 νμ interactions are compared in two detectors located along the beam axis at distances of 1 and 735 km. With 1.27×1020 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 νμ disappearance via oscillations with |Δm322|=2.740.26+0.44×103eV2 and sin2(2θ23)>0.87 (68% C.L.).

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  • Received 4 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.191801

©2006 American Physical Society

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Vol. 97, Iss. 19 — 10 November 2006

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