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Evidence of electron neutrino appearance in a muon neutrino beam
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T2K Collaboration (Including: Barker, Gary John, Boyd, Steve B., Dennis, Stephen R., Furmanski, Andrew P., Hadley, David R., Haigh, Martin David, Lister, Callum, Litchfield, Reuban P. and Scully, D. I.). (2013) Evidence of electron neutrino appearance in a muon neutrino beam. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 88 (Number 3). Article Number 032002 . doi:10.1103/PhysRevD.88.032002 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.88.032002
Abstract
The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |Δm232|≈2.4×10−3 eV2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam’s origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3±0.4(syst) events is expected. The background-only hypothesis is rejected with a p value of 0.0009 (3.1σ), and a fit assuming νμ→νe oscillations with sin22θ23=1, δCP=0 and |Δm232|=2.4×10−3 eV2 yields sin22θ13=0.088+0.049−0.039(stat+syst).
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1550-7998 | ||||
| Official Date: | August 2013 | ||||
| Dates: |
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| Volume: | Volume 88 | ||||
| Number: | Number 3 | ||||
| Article Number: | Article Number 032002 | ||||
| DOI: | 10.1103/PhysRevD.88.032002 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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