Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos

Hyper-Kamiokande Collaboration

doi:10.1140/epjc/s10052-025-14938-9

Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos

Hyper-Kamiokande Collaboration

Institute for Cosmic Ray Research
University of Tokyo
King's College London
Sorbonne Université
Université Paris-Saclay
Jagiellonian University
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Imperial College London
Department of Physics
Kobe University
ETH Zurich
Institute for Nuclear Physics
Warsaw University of Technology
National Centre for Nuclear Research
Department of Theoretical Physics and CIAFF
Universidad Autónoma de Madrid
National University of Kyiv
TRIUMF
Department of Physics
Sungkyunkwan University
Department of Physics
University of Regina
Institute for Space-Earth Environmental Research
Nagoya University
Department of Physics
Physics and Astronomy
Tokyo University of Science
Department of Physics and Astronomy
Seoul National University
Chonnam National University
Department of Physics
Osaka City University
Tokyo Institute of Technology
School of Mathematical and Physical Sciences
The University of Sheffield
Department of Physics
Kyoto University
University of Oxford
Virginia Polytechnic Institute and State University
CCLRC Rutherford Appleton Laboratory
INFN Sezione di Napoli
Università della Campania L. Vanvitelli
University of Warwick

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

7 Citations (Scopus)

Abstract

This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δm322 parameter, and a resolution between 3% and 0.5% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.

Original language	English
Article number	170
Journal	European Physical Journal C
Volume	86
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s10052-025-14938-9
Publication status	Published - 1 Feb 2026

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@article{07270f60ca64489496839a0e30b53d3f,

title = "Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos",

abstract = "This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25{\textendash}100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60\% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5\% resolution on the Δm322 parameter, and a resolution between 3\% and 0.5\% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.",

author = "Hyper-Kamiokande Collaboration and S. Zsoldos and M. Zito and K. Zietara and M. Ziembicki and T. Zhu and H. Zhong and X. Zhao and G. Zarnecki and K. Zaremba and J. Zalipska and B. Zaldivar and O. Yuriy and T. Yu and I. Yu and S. Yousefnejad and Y. Yoshioka and Y. Yoshimoto and T. Yoshida and J. Yoo and M. Yokoyama and U. Yevarouskaya and N. Yershov and T. Yano and Yang, \{B. S.\} and K. Yamauchi and M. Yamashita and K. Yamamoto and Y. Yamaguchi and Z. Xie and J. Xia and J. Wuethrich and S. Wronka and M. Wojciechowski and S. Wilson and Wilson, \{J. R.\} and R. Wendell and D. Wark and T. Wachala and M. Vyalkov and R. Vogelaar and T. Vladisavljevic and D. Vivolo and U. Virginet and B. Vinning and R. Rogly and B. Quilain and P. Paganini and M. Gonin and O. Drapier and \{Buizza Avanzini\}, M.",

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T1 - Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos

AU - Hyper-Kamiokande Collaboration

AU - Zsoldos, S.

AU - Zito, M.

AU - Zietara, K.

AU - Ziembicki, M.

AU - Zhu, T.

AU - Zhong, H.

AU - Zhao, X.

AU - Zarnecki, G.

AU - Zaremba, K.

AU - Zalipska, J.

AU - Zaldivar, B.

AU - Yuriy, O.

AU - Yu, T.

AU - Yu, I.

AU - Yousefnejad, S.

AU - Yoshioka, Y.

AU - Yoshimoto, Y.

AU - Yoshida, T.

AU - Yoo, J.

AU - Yokoyama, M.

AU - Yevarouskaya, U.

AU - Yershov, N.

AU - Yano, T.

AU - Yang, B. S.

AU - Yamauchi, K.

AU - Yamashita, M.

AU - Yamamoto, K.

AU - Yamaguchi, Y.

AU - Xie, Z.

AU - Xia, J.

AU - Wuethrich, J.

AU - Wronka, S.

AU - Wojciechowski, M.

AU - Wilson, S.

AU - Wilson, J. R.

AU - Wendell, R.

AU - Wark, D.

AU - Wachala, T.

AU - Vyalkov, M.

AU - Vogelaar, R.

AU - Vladisavljevic, T.

AU - Vivolo, D.

AU - Virginet, U.

AU - Vinning, B.

AU - Rogly, R.

AU - Quilain, B.

AU - Paganini, P.

AU - Gonin, M.

AU - Drapier, O.

AU - Buizza Avanzini, M.

PY - 2026/2/1

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N2 - This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δm322 parameter, and a resolution between 3% and 0.5% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.

AB - This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δm322 parameter, and a resolution between 3% and 0.5% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.

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DO - 10.1140/epjc/s10052-025-14938-9

M3 - Article

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SN - 1434-6044

VL - 86

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 170

ER -

Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos

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