First direct observation of muon antineutrino disappearance

Adamson, P, Andreopoulos, C, Auty, D., Ayres, D.S, Backhouse, C, Barr, G, Bishai, M, Blake, A, Block, G.J, Boehnlein, D.J, Devenish, N.E, Falk, E, Hartnell, J, Lefeuvre G, G and et al, (2011) First direct observation of muon antineutrino disappearance. Physical Review Letters, 107 (2). 021801. ISSN 0031-9007

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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 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: David Auty
Date Deposited: 06 Feb 2012 19:27
Last Modified: 09 Mar 2017 06:23

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