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arxiv: 1202.2772 · v1 · submitted 2012-02-13 · ✦ hep-ex

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An improved measurement of muon antineutrino disappearance in MINOS

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classification ✦ hep-ex
keywords anti-neutrinomuonmeasurementatmosphericdisappearanceimprovedminospreviously
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We report an improved measurement of muon anti-neutrino disappearance over a distance of 735km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a muon anti-neutrino enhanced configuration. From a total exposure of 2.95e20 protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of the anti-neutrino "atmospheric" delta-m squared = 2.62 +0.31/-0.28 (stat.) +/- 0.09 (syst.) and constrain the anti-neutrino atmospheric mixing angle >0.75 (90%CL). These values are in agreement with those measured for muon neutrinos, removing the tension reported previously.

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