Observation of electron neutrino appearance in a muon neutrino beam.
- Abe, K
- Adam, J
- Aihara, H
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- Andreopoulos, C
- Aoki, S
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- Ariga, T
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- Yamamoto, K
- Yanagisawa, C
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- Yokoyama, M
- Yuan, T
- Zalewska, A
- Zalipska, J
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Publication date
February 2014
DOI Publisher
American Physical Society (APS) Journal
Physical Review LettersAbstract
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 Δm(32)(2) and a CP violating phase δ(CP). In this neutrino oscillation scenario, assuming |Δm(32)(2)|=2.4×10(-3) eV(2), sin(2)θ(23)=0.5, and Δm322>0 (Δm(32)(2)<0), a best-fit value o...
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