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First direct observation of muon antineutrino disappearance |
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| Authors: | Adamson P Andreopoulos C Auty D J Ayres D S Backhouse C Barr G Bishai M Blake A Bock G J Boehnlein D J Bogert D Cavanaugh S Cherdack D Childress S Choudhary B C Coelho J A B Coleman S J Corwin L Cronin-Hennessy D Danko I Z de Jong J K Devenish N E Diwan M V Dorman M Escobar C O Evans J J Falk E Feldman G J Frohne M V Gallagher H R Gomes R A Goodman M C Gouffon P Graf N Gran R Grant N Grzelak K Habig A Harris D Hartnell J Hatcher R Himmel A Holin A Howcroft C Huang X Hylen J Ilic J Irwin G M Isvan Z Jaffe D E James C Jensen D Kafka T Kasahara S M S Koizumi G Kopp S Kordosky M Kreymer A Lang K |
| Institution: | Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA. |
| 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 × 102? 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 |Δm2| = 3.36(-0.40)(+0.46)(stat) ± 0.06(syst)] × 10?3 eV2, sin2(2θ) = 0.86(-0.12)(+0.11)(stat) ± 0.01(syst). The MINOS ν(μ) and ν(μ) measurements are consistent at the 2.0% confidence level, assuming identical underlying oscillation parameters. |
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