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arxiv: 1104.3922 · v4 · submitted 2011-04-20 · ✦ hep-ex

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Active to sterile neutrino mixing limits from neutral-current interactions in MINOS

MINOS Collaboration: P. Adamson , D. J. Auty , D. S. Ayres , C. Backhouse , G. Barr , M. Bishai , A. Blake , G. J. Bock
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classification ✦ hep-ex
keywords neutrinoactiveneutral-currentinteractionsminososcillationssterilebeam
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Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on the observation of neutral-current neutrino interactions, from an exposure to the NuMI neutrino beam of $7.07\times10^{20}$ protons on target. A total of 802 neutral-current event candidates is observed in the Far Detector, compared to an expected number of $754\pm28\rm{(stat.)}\pm{37}\rm{(syst.)}$ for oscillations among three active flavors. The fraction $f_s$ of disappearing \numu that may transition to $\nu_s$ is found to be less than 22% at the 90% C.L.

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