Publication: First Direct Observation of Muon Antineutrino Disappearance
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Date
2011
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American Physical Society (APS)
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Adamson, P., C. Andreopoulos, D. J. Auty, D. S. Ayres, C. Backhouse, G. Barr, M. Bishai, et al. 2011. “First Direct Observation of Muon Antineutrino Disappearance.” Physical Review Letters 107 (2) (July). doi:10.1103/physrevlett.107.021801.
Abstract
This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν⎯⎯μ production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν⎯⎯μ events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm⎯⎯⎯2|=[3.36+0.46−0.40(stat)±0.06(syst)]×10−3 eV2, sin2(2θ⎯⎯)=0.86+0.11−0.12(stat)±0.01(syst). The MINOS νμ and ν⎯⎯μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters.
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antineutrino/mu: secondary beam, MINOS, antineutrino nucleon: interaction, charged current, neutrino: oscillation, far detector, antineutrino/mu: energy spectrum, antineutrino: mass difference, antineutrino: mixing angle, experimental results
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