Evidence of electron neutrino appearance in a muon neutrino beam

Evidence of electron neutrino appearance in a muon neutrino beam

The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |Δm322|≈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 k...

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Hlavní autoři: Abe, K, Abgrall, N, Aihara, H, Akiri, T, Albert, J, Andreopoulos, C, Aoki, S, Ariga, A, Ariga, T, Assylbekov, S, Autiero, D, Barbi, M, Barker, G, Barr, G, Bass, M, Batkiewicz, M, Bay, F, Bentham, S, Berardi, V, Berger, B, Berkman, S, Bertram, I, Beznosko, D, Bhadra, S, Blaszczyk, F
Médium: Journal article
Jazyk:English
Vydáno: 2013
Popis
Shrnutí:The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |Δm322|≈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 sinâ¡22θ23=1, δCP=0 and |Δm322|=2.4×10-3 eV2 yields sinâ¡22θ13=0.088-0.039+0. 049(stat+syst). © 2013 American Physical Society.

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