Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ -like Sample

(T2K Collaboration)

doi:10.1103/gh5j-5cwv

Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ -like Sample

(T2K Collaboration)

The University of Tokyo
KEK
Lancaster University
University of Sheffield
Eidgenossische Technische Hochschule Zurich
Imperial College London
Kobe University
Tokyo Metropolitan University
Kyoto University
Cyclotron and Radioisotope Center
Louisiana State University
Joint Institute for Nuclear Research, Dubna
University of Warwick
University of Oxford
University of Liverpool
Polish Academy of Sciences
Politecnico di Bari
European Organization for Nuclear Research
Global Health Institute
University of Paris VI - Pierre and Marie Curie University
Université Paris-Saclay
Yokohama National University
University of Silesia in Katowice
Laboratoire Leprince-Ringuet
Universidad de Sevilla
ICISE
King's College London

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

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Abstract

We have made improved measurements of three-flavor neutrino mixing with 19.7(16.3)×1020 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, as well as new proton and photon-tagged samples at the near detector. Significant improvements have been made to the flux and neutrino interaction modeling. T2K data continue to prefer the normal mass ordering and upper octant of sin2θ23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δCP=-2.18-0.47+1.22, sin2θ23=0.559-0.078+0.018 and Δm322=(+2.506-0.052+0.039)×10-3 eV2.

Original language	English
Article number	261801
Journal	Physical Review Letters
Volume	135
Issue number	26
Early online date	29 Dec 2025
DOIs	https://doi.org/10.1103/gh5j-5cwv
Publication status	Published - Dec 2025

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@article{40326ec4c14b4042ad8f9a4bcadf74a7,

title = "Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ -like Sample",

abstract = "We have made improved measurements of three-flavor neutrino mixing with 19.7(16.3)×1020 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, as well as new proton and photon-tagged samples at the near detector. Significant improvements have been made to the flux and neutrino interaction modeling. T2K data continue to prefer the normal mass ordering and upper octant of sin2θ23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δCP=-2.18-0.47+1.22, sin2θ23=0.559-0.078+0.018 and Δm322=(+2.506-0.052+0.039)×10-3 eV2.",

author = "K. Abe and S. Abe and R. Akutsu and H. Alarakia-Charles and \{Alj Hakim\}, \{Y. I.\} and \{Alonso Monsalve\}, S. and L. Anthony and S. Aoki and Apte, \{K. A.\} and T. Arai and T. Arihara and S. Arimoto and Y. Ashida and Atkin, \{E. T.\} and N. Babu and V. Baranov and Barker, \{G. J.\} and G. Barr and D. Barrow and P. Bates and L. Bathe-Peters and M. Batkiewicz-Kwasniak and N. Baudis and V. Berardi and L. Berns and S. Bhattacharjee and A. Blanchet and A. Blondel and Boistier, \{P. M.M.\} and S. Bolognesi and S. Bordoni and Boyd, \{S. B.\} and C. Bronner and A. Bubak and \{Buizza Avanzini\}, M. and Caballero, \{J. A.\} and F. Cadoux and Calabria, \{N. F.\} and S. Cao and S. Cap and D. Carabadjac and \{Di Lodovico\}, F. and T. Katori and S. King and N. Latham and Lewis, \{S. V.\} and \{Lopez Moreno\}, A. and R. Ramsden and Wilson, \{J. R.\} and S. Zsoldos and \{(T2K Collaboration)\}",

note = "Publisher Copyright: {\textcopyright} 2025 authors.",

year = "2025",

month = dec,

doi = "10.1103/gh5j-5cwv",

language = "English",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "26",

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TY - JOUR

T1 - Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ -like Sample

AU - Abe, K.

AU - Abe, S.

AU - Akutsu, R.

AU - Alarakia-Charles, H.

AU - Alj Hakim, Y. I.

AU - Alonso Monsalve, S.

AU - Anthony, L.

AU - Aoki, S.

AU - Apte, K. A.

AU - Arai, T.

AU - Arihara, T.

AU - Arimoto, S.

AU - Ashida, Y.

AU - Atkin, E. T.

AU - Babu, N.

AU - Baranov, V.

AU - Barker, G. J.

AU - Barr, G.

AU - Barrow, D.

AU - Bates, P.

AU - Bathe-Peters, L.

AU - Batkiewicz-Kwasniak, M.

AU - Baudis, N.

AU - Berardi, V.

AU - Berns, L.

AU - Bhattacharjee, S.

AU - Blanchet, A.

AU - Blondel, A.

AU - Boistier, P. M.M.

AU - Bolognesi, S.

AU - Bordoni, S.

AU - Boyd, S. B.

AU - Bronner, C.

AU - Bubak, A.

AU - Buizza Avanzini, M.

AU - Caballero, J. A.

AU - Cadoux, F.

AU - Calabria, N. F.

AU - Cao, S.

AU - Cap, S.

AU - Carabadjac, D.

AU - Di Lodovico, F.

AU - Katori, T.

AU - King, S.

AU - Latham, N.

AU - Lewis, S. V.

AU - Lopez Moreno, A.

AU - Ramsden, R.

AU - Wilson, J. R.

AU - Zsoldos, S.

AU - (T2K Collaboration)

PY - 2025/12

Y1 - 2025/12

N2 - We have made improved measurements of three-flavor neutrino mixing with 19.7(16.3)×1020 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, as well as new proton and photon-tagged samples at the near detector. Significant improvements have been made to the flux and neutrino interaction modeling. T2K data continue to prefer the normal mass ordering and upper octant of sin2θ23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δCP=-2.18-0.47+1.22, sin2θ23=0.559-0.078+0.018 and Δm322=(+2.506-0.052+0.039)×10-3 eV2.

AB - We have made improved measurements of three-flavor neutrino mixing with 19.7(16.3)×1020 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, as well as new proton and photon-tagged samples at the near detector. Significant improvements have been made to the flux and neutrino interaction modeling. T2K data continue to prefer the normal mass ordering and upper octant of sin2θ23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δCP=-2.18-0.47+1.22, sin2θ23=0.559-0.078+0.018 and Δm322=(+2.506-0.052+0.039)×10-3 eV2.

UR - https://www.scopus.com/pages/publications/105026319392

U2 - 10.1103/gh5j-5cwv

DO - 10.1103/gh5j-5cwv

M3 - Article

C2 - 41557381

AN - SCOPUS:105026319392

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26

M1 - 261801

ER -

Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ -like Sample

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