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  • PhysRevLett.107.021801

    Rights statement: © 2011 American Physical Society

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First direct observation of muon antineutrino disappearance

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Article number021801
<mark>Journal publication date</mark>5/07/2011
<mark>Journal</mark>Physical review letters
Issue number2
Number of pages5
Publication StatusPublished
<mark>Original language</mark>English


This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν̅ μ production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν̅ μ events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm̅ 2|=[3.36-0.40+0.46(stat)±0.06(syst)]×10-3  eV2, sin⁡2(2θ̅ )=0.86-0.12+0.11(stat)±0.01(syst). The MINOS νμ and ν̅ μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.

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© 2011 American Physical Society