Testing T2K’s Bayesian constraints with priors in alternate parameterisations

T2K Collaboration

doi:10.1140/epjc/s10052-025-14836-0

Testing T2K’s Bayesian constraints with priors in alternate parameterisations

T2K Collaboration

Physics and Astronomy

University of Bern
Colorado State University
School of Physics and Astronomy
Queen Mary University of London
Department of Physics
University of Regina
University of Toronto
Department of Physics
University of Winnipeg
King's College London
Sorbonne Université
University of Colorado Boulder
Warsaw University of Technology
Imperial College London
Kobe University
Stony Brook University
Swiss Federal Institute of Technology Zurich
TRIUMF
SLAC National Accelerator Laboratory
Institute of Nuclear Physics
National Centre for Nuclear Research
York University Toronto
Kyoto University
The University of Tokyo
Institute for Nuclear Research of the Russian Academy of Sciences
University of Oxford
City University of New York
Osaka Metropolitan University
Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP)
Lawrence Berkeley National Laboratory
University of Minnesota Twin Cities
Johannes Gutenberg University Mainz
STFC Rutherford Appleton Laboratory
Boston University
Michigan State University
University of Sheffield
Tohoku University
CERN
University of Geneva
Université Paris-Saclay
Joint Institute for Nuclear Research
The Barcelona Institute of Science and Technology
University of California at Irvine
Louisiana State University

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

Abstract

Bayesian analysis results require a choice of prior distribution. In long-baseline neutrino oscillation physics, the usual parameterisation of the mixing matrix induces a prior that privileges certain neutrino mass and flavour state symmetries. Here we study the effect of privileging alternate symmetries on the results of the T2K experiment. We find that constraints on the level of CP violation (as given by the Jarlskog invariant) are robust under the choices of prior considered in the analysis. On the other hand, the degree of octant preference for the atmospheric angle depends on which symmetry has been privileged.

Original language	English
Article number	1414
Journal	European Physical Journal C
Volume	85
Issue number	12
DOIs	https://doi.org/10.1140/epjc/s10052-025-14836-0
State	Published - Dec 2025

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@article{c722ce5be7d846aaa0dcebc5192a3795,

title = "Testing T2K{\textquoteright}s Bayesian constraints with priors in alternate parameterisations",

abstract = "Bayesian analysis results require a choice of prior distribution. In long-baseline neutrino oscillation physics, the usual parameterisation of the mixing matrix induces a prior that privileges certain neutrino mass and flavour state symmetries. Here we study the effect of privileging alternate symmetries on the results of the T2K experiment. We find that constraints on the level of CP violation (as given by the Jarlskog invariant) are robust under the choices of prior considered in the analysis. On the other hand, the degree of octant preference for the atmospheric angle depends on which symmetry has been privileged.",

author = "T2K Collaboration and S. Zsoldos and M. Zito and Zimmerman, \{E. D.\} and M. Ziembicki and T. Zhu and H. Zhong and H. Zheng and Zhao, \{X. Y.\} and J. Zhang and G. Zarnecki and J. Zalipska and A. Zalewska and R. Zaki and Y. Yoshimura and Y. Yoshimoto and M. Yokoyama and U. Yevarouskaya and N. Yershov and T. Yano and Y. Yang and C. Yanagisawa and T. Yamamoto and K. Yamamoto and J. Xia and C. Wret and K. Wood and Wilson, \{J. R.\} and C. Wilkinson and Wilking, \{M. J.\} and R. Wendell and A. Weber and Wascko, \{M. O.\} and D. Wark and L. Wan and Walsh, \{J. G.\} and Wallace, \{H. T.\} and D. Wakabayashi and Wada, \{S. I.\} and T. Wachala and T. Vladisavljevic and U. Virginet and E. Villa and G. Vasseur and I. Vasilyev and M. Varghese and M. Vagins and Y. Uchida and M. Tzanov and C. Riccio and C. McGrew",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = dec,

doi = "10.1140/epjc/s10052-025-14836-0",

language = "English",

volume = "85",

journal = "European Physical Journal C",

issn = "1434-6044",

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TY - JOUR

T1 - Testing T2K’s Bayesian constraints with priors in alternate parameterisations

AU - T2K Collaboration

AU - Zsoldos, S.

AU - Zito, M.

AU - Zimmerman, E. D.

AU - Ziembicki, M.

AU - Zhu, T.

AU - Zhong, H.

AU - Zheng, H.

AU - Zhao, X. Y.

AU - Zhang, J.

AU - Zarnecki, G.

AU - Zalipska, J.

AU - Zalewska, A.

AU - Zaki, R.

AU - Yoshimura, Y.

AU - Yoshimoto, Y.

AU - Yokoyama, M.

AU - Yevarouskaya, U.

AU - Yershov, N.

AU - Yano, T.

AU - Yang, Y.

AU - Yanagisawa, C.

AU - Yamamoto, T.

AU - Yamamoto, K.

AU - Xia, J.

AU - Wret, C.

AU - Wood, K.

AU - Wilson, J. R.

AU - Wilkinson, C.

AU - Wilking, M. J.

AU - Wendell, R.

AU - Weber, A.

AU - Wascko, M. O.

AU - Wark, D.

AU - Wan, L.

AU - Walsh, J. G.

AU - Wallace, H. T.

AU - Wakabayashi, D.

AU - Wada, S. I.

AU - Wachala, T.

AU - Vladisavljevic, T.

AU - Virginet, U.

AU - Villa, E.

AU - Vasseur, G.

AU - Vasilyev, I.

AU - Varghese, M.

AU - Vagins, M.

AU - Uchida, Y.

AU - Tzanov, M.

AU - Riccio, C.

AU - McGrew, C.

PY - 2025/12

Y1 - 2025/12

N2 - Bayesian analysis results require a choice of prior distribution. In long-baseline neutrino oscillation physics, the usual parameterisation of the mixing matrix induces a prior that privileges certain neutrino mass and flavour state symmetries. Here we study the effect of privileging alternate symmetries on the results of the T2K experiment. We find that constraints on the level of CP violation (as given by the Jarlskog invariant) are robust under the choices of prior considered in the analysis. On the other hand, the degree of octant preference for the atmospheric angle depends on which symmetry has been privileged.

AB - Bayesian analysis results require a choice of prior distribution. In long-baseline neutrino oscillation physics, the usual parameterisation of the mixing matrix induces a prior that privileges certain neutrino mass and flavour state symmetries. Here we study the effect of privileging alternate symmetries on the results of the T2K experiment. We find that constraints on the level of CP violation (as given by the Jarlskog invariant) are robust under the choices of prior considered in the analysis. On the other hand, the degree of octant preference for the atmospheric angle depends on which symmetry has been privileged.

UR - https://www.scopus.com/pages/publications/105026601418

U2 - 10.1140/epjc/s10052-025-14836-0

DO - 10.1140/epjc/s10052-025-14836-0

M3 - Article

AN - SCOPUS:105026601418

SN - 1434-6044

VL - 85

JO - European Physical Journal C

JF - European Physical Journal C

IS - 12

M1 - 1414

ER -

Testing T2K’s Bayesian constraints with priors in alternate parameterisations

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