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Improved search for Muon-neutrino to electron-neutrino oscillations in MINOS |
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| Authors: | Adamson P Auty D J Ayres D S Backhouse C Barr G Betancourt M Bishai M Blake A Bock G J Boehnlein D J Bogert D Cao S V Cavanaugh S Cherdack D Childress S Coelho J A B 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 Grzelak K Habig A Hartnell J Hatcher R Himmel A Holin A Huang X Hylen 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 Lefeuvre G Ling J Litchfield P J Loiacono L Lucas P |
| Institution: | Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA. |
| Abstract: | We report the results of a search for ν(e) appearance in a ν(μ) beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 × 10(20) protons on the NuMI target at Fermilab, we find that 2 sin(2) (θ(23))sin(2)(2θ(13))<0.12(0.20) at 90% confidence level for δ = 0 and the normal (inverted) neutrino mass hierarchy, with a best-fit of 2sin(2) (θ(23))sin(2)(2θ(13)) = 0.041(-0.031)(+0.047) (0.079(-0.053) (+0.071)). The θ(13) = 0 hypothesis is disfavored by the MINOS data at the 89% confidence level. |
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