First direct observation of Muon antineutrino disappearance

First direct observation of Muon antineutrino disappearance

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This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν̄μ production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν̄μ events are observed. Th...

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Bibliographic Details
Main Authors: Adamson, P, Andreopoulos, C, Auty, D, Ayres, D, Backhouse, C, Barr, G, Bishai, M, Blake, A, Bock, G, Boehnlein, D, Bogert, D, Cavanaugh, S, Cherdack, D, Childress, S, Choudhary, B, Coelho, J, Coleman, S, Corwin, L, Cronin-Hennessy, D, Danko, I, De Jong, J, Devenish, N, Diwan, M, Dorman, M, Escobar, C
Format: Journal article
Language:English
Published: 2011
Description
Summary:This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν̄μ production, accumulating an exposure of 1.71×1020 protons on target. In the Far Detector, 97 charged current ν̄μ events are observed. The no-oscillation hypothesis predicts 156 events and is excluded at 6.3σ. The best fit to oscillation yields |Δm⊃̄2|=[3.36-0.40+0.46(stat)±0.06(syst)] ×10⊃-3eV2, ⊃sin⊃2(2θ̄)=0.86-0.12+0.11(stat) ±0.01(syst). The MINOS νμ and ν̄μ measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters. © 2011 American Physical Society.

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