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Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam |
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| Authors: | Abe K Abgrall N Ajima Y Aihara H Albert J B Andreopoulos C Andrieu B Aoki S Araoka O Argyriades J Ariga A Ariga T Assylbekov S Autiero D Badertscher A Barbi M Barker G J Barr G Bass M Bay F Bentham S Berardi V Berger B E Bertram I Besnier M Beucher J Beznosko D Bhadra S Blaszczyk F d M M Blondel A Bojechko C Bouchez J Boyd S B Bravar A Bronner C Brook-Roberge D G Buchanan N Budd H Calvet D Cartwright S L Carver A Castillo R Catanesi M G Cazes A Cervera A Chavez C Choi S Christodoulou G Coleman J Coleman W Collazuol G Connolly K Curioni A Dabrowska A Danko I Das R Davies G S Davis S Day M |
| Institution: | University of Tokyo, Institute for Cosmic Ray Research, Kamioka Observatory, Kamioka, Japan. |
| Abstract: | The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy. |
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