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Observation 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 and Litchfield, Reuban P.). (2014) Observation of electron neutrino appearance in a muon neutrino beam. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 112 (Number 6). Article Number 061802 . doi:10.1103/PhysRevLett.112.061802 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.112.061802
Abstract
The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3σ when compared to 4.92±0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles θ12, θ23, θ13, a mass difference Δm232 and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm232|=2.4×10−3 eV2, sin2θ23=0.5, and Δm232>0 (Δm232<0), a best-fit value of sin22θ13=0.140+0.038−0.032 (0.170+0.045−0.037) is obtained at δCP=0. When combining the result with the current best knowledge of oscillation parameters including the world average value of θ13 from reactor experiments, some values of δCP are disfavored at the 90% C.L.
Item Type: | Journal Article | ||||
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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: | February 2014 | ||||
Dates: |
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Volume: | Volume 112 | ||||
Number: | Number 6 | ||||
Article Number: | Article Number 061802 | ||||
DOI: | 10.1103/PhysRevLett.112.061802 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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