Observation of electron neutrino appearance in a muon neutrino beam

T2K Collaboration

doi:10.1103/PhysRevLett.112.061802

Observation of electron neutrino appearance in a muon neutrino beam

T2K Collaboration

Physics and Astronomy

Joint Institute for Nuclear Research
The University of Tokyo
Stony Brook University
Duke University
STFC Rutherford Appleton Laboratory
Kobe University
University of Bern
Colorado State University
Universite Claude Bernard Lyon 1
University of Regina
University of Warwick
University of Oxford
Institute of Nuclear Physics
Swiss Federal Institute of Technology Zurich
Lancaster University
Polytechnic University of Bari
University of British Columbia
York University Toronto
Louisiana State University
University of Geneva
University of Victoria BC
Institute for High Energy Physics
Imperial College London
Kyoto University
University of Liverpool
University of Sheffield
CSIC
University of Colorado Boulder
University of Padua
University of Washington
Queen Mary University of London
University of Pittsburgh

Research output: Contribution to journal › Article › peer-review

470 Scopus citations

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 Δm² ₃₂and a CP violating phase δ_CP. In this neutrino oscillation scenario, assuming |Δm² ₃₂| = 2.4 × 10^-3eV², sin²θ₂₃= 0.5, and Δm² ₃₂> 0 (Δm² ₃₂< 0), a best-fit value of sin²2θ₁₃= 0.140^+0.038 _-0.032(0.170^+0.045 _-0.037) is obtained at δ_CP= 0. When combining the result with the current best knowledge of oscillation parameters including the world average value of θ₁₃from reactor experiments, some values of δ_CPare disfavored at the 90% C.L.

Original language	English
Article number	061802
Journal	Physical Review Letters
Volume	112
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.112.061802
State	Published - Feb 10 2014

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10.1103/PhysRevLett.112.061802

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@article{565f94fb229e46a785495971328e1b2e,

title = "Observation of electron neutrino appearance in a muon neutrino beam",

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 Δm2 32and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm2 32| = 2.4 × 10-3eV2, sin2θ23= 0.5, and Δm2 32> 0 (Δm2 32< 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 θ13from reactor experiments, some values of δCPare disfavored at the 90\% C.L.",

author = "\{T2K Collaboration\} and K. Abe and J. Adam and H. Aihara and T. Akiri and C. Andreopoulos and S. Aoki and A. Ariga and T. Ariga and S. Assylbekov and D. Autiero and M. Barbi and Barker, \{G. J.\} and G. Barr and M. Bass and M. Batkiewicz and F. Bay and Bentham, \{S. W.\} and V. Berardi and Berger, \{B. E.\} and S. Berkman and I. Bertram and S. Bhadra and Blaszczyk, \{F. D.M.\} and A. Blondel and C. Bojechko and S. Bordoni and Boyd, \{S. B.\} and D. Brailsford and A. Bravar and C. Bronner and N. Buchanan and Calland, \{R. G.\} and \{Caravaca Rodriguez\}, J. and Cartwright, \{S. L.\} and R. Castillo and Catanesi, \{M. G.\} and A. Cervera and D. Cherdack and G. Christodoulou and A. Clifton and J. Coleman and Coleman, \{S. J.\} and G. Collazuol and K. Connolly and L. Cremonesi and A. Dabrowska and I. Danko and R. Das and Jung, \{C. K.\} and C. McGrew",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

month = feb,

day = "10",

doi = "10.1103/PhysRevLett.112.061802",

language = "English",

volume = "112",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "6",

}

TY - JOUR

T1 - Observation of electron neutrino appearance in a muon neutrino beam

AU - T2K Collaboration

AU - Abe, K.

AU - Adam, J.

AU - Aihara, H.

AU - Akiri, T.

AU - Andreopoulos, C.

AU - Aoki, S.

AU - Ariga, A.

AU - Ariga, T.

AU - Assylbekov, S.

AU - Autiero, D.

AU - Barbi, M.

AU - Barker, G. J.

AU - Barr, G.

AU - Bass, M.

AU - Batkiewicz, M.

AU - Bay, F.

AU - Bentham, S. W.

AU - Berardi, V.

AU - Berger, B. E.

AU - Berkman, S.

AU - Bertram, I.

AU - Bhadra, S.

AU - Blaszczyk, F. D.M.

AU - Blondel, A.

AU - Bojechko, C.

AU - Bordoni, S.

AU - Boyd, S. B.

AU - Brailsford, D.

AU - Bravar, A.

AU - Bronner, C.

AU - Buchanan, N.

AU - Calland, R. G.

AU - Caravaca Rodriguez, J.

AU - Cartwright, S. L.

AU - Castillo, R.

AU - Catanesi, M. G.

AU - Cervera, A.

AU - Cherdack, D.

AU - Christodoulou, G.

AU - Clifton, A.

AU - Coleman, J.

AU - Coleman, S. J.

AU - Collazuol, G.

AU - Connolly, K.

AU - Cremonesi, L.

AU - Dabrowska, A.

AU - Danko, I.

AU - Das, R.

AU - Jung, C. K.

AU - McGrew, C.

PY - 2014/2/10

Y1 - 2014/2/10

N2 - 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 Δm2 32and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm2 32| = 2.4 × 10-3eV2, sin2θ23= 0.5, and Δm2 32> 0 (Δm2 32< 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 θ13from reactor experiments, some values of δCPare disfavored at the 90% C.L.

AB - 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 Δm2 32and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm2 32| = 2.4 × 10-3eV2, sin2θ23= 0.5, and Δm2 32> 0 (Δm2 32< 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 θ13from reactor experiments, some values of δCPare disfavored at the 90% C.L.

UR - https://www.scopus.com/pages/publications/84894446275

U2 - 10.1103/PhysRevLett.112.061802

DO - 10.1103/PhysRevLett.112.061802

M3 - Article

AN - SCOPUS:84894446275

SN - 0031-9007

VL - 112

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 061802

ER -

Observation of electron neutrino appearance in a muon neutrino beam

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