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Evidence of electron neutrino appearance in a muon neutrino beam

Contributors

T2K Collaboration

Collaborators

Abgrall, Nicolas; Blondel, Alain; Bravar, Alessandro; Dufour, Fanny; Haesler, Alexis; Korzenev, Alexander; Murphy, Sébastien; Ravonel Salzgeber, Melody; Rayner, Mark; Scantamburlo, Enrico

Published in

Physical review. D. Particles, fields, gravitation, and cosmology, vol. 88, no. 13, 132002

Publication date

2013

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).

UNIGE affiliation entities

Citation (ISO format)

T2K Collaboration. Evidence of electron neutrino appearance in a muon neutrino beam. In: Physical review. D. Particles, fields, gravitation, and cosmology, 2013, vol. 88, n° 13, p. 132002. doi: 10.1103/PhysRevD.88.032002

Main files (1)

Article (Published version)

Identifiers

Additional URL for this publication

http://journals.aps.org/prd/abstract/10.1103/PhysRevD.88.032002

Journal ISSN

1550-2368
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434downloads

Technical informations

Creation

12/09/2014 10:22:00

First validation

12/09/2014 10:22:00

Update

13/10/2025 22:24:17

Status update

14/03/2023 21:45:40

Last indexation

10/11/2026 17:08:25
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