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 25–100 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 $$5\sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mi>σ</mml:mi> </mml:mrow> </mml:math> 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 $$5\sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mi>σ</mml:mi> </mml:mrow> </mml:math> C.L. is possible for more than 60% of the actual values of the CP-violating phase, $$\delta _{CP}.$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>δ</mml:mi> <mml:mrow> <mml:mi>CP</mml:mi> </mml:mrow> </mml:msub> <mml:mo>.</mml:mo> </mml:mrow> </mml:math> Moreover, we will measure $$\delta _{CP}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>δ</mml:mi> <mml:mrow> <mml:mi>CP</mml:mi> </mml:mrow> </mml:msub> </mml:math> with a precision ranging from 20 $$^{\circ },$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> <mml:mo>,</mml:mo> </mml:mrow> </mml:math> in the case of maximal CP violation, to 6 $$^{\circ },$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> <mml:mo>,</mml:mo> </mml:mrow> </mml:math> in the case of CP conservation. We aim to achieve a 0.5% resolution on the $$\Delta m^2_{32}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mn>32</mml:mn> <mml:mn>2</mml:mn> </mml:msubsup> </mml:mrow> </mml:math> parameter, and a resolution between 3% and 0.5% on the $$\sin ^2\theta _{23}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mo>sin</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:msub> <mml:mi>θ</mml:mi> <mml:mn>23</mml:mn> </mml:msub> </mml:mrow> </mml:math> 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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The European Physical Journal C
Published
2026-02-23
DOI
https://doi.org/10.1140/epjc/s10052-025-14938-9
Primary Topic
Neutrino Physics Research
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article
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article

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

G. Galiński, S.C. Joshi, K. Ieki, L. Koerich et al.
The European Physical Journal C
Neutrino Physics Research
article

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

G. Galiński, S.C. Joshi, K. Ieki, L. Koerich, L. Ludovici, Adrien Blanchet, A. Rychter, A. Giampaolo, Hua Hua, P. Ferrario, K. Ishidoshiro, Alberto Longhin, M. Scott, E. De la Fuente, G. Burton, C. Bozza, M. Daoud, Michael J. Scott, V. Mikola, John B. Kisiel, M. Batkiewicz, A. Di Nitto, R. Matsumoto, Davide Bianco, K. Ninomiya, Timothy C. Doyle, G. Eurin, J. Renner, A. Blondel, A. De Lorenzis, A. Tarrant, M. Suchenek, M. Pari, R. Gornea, D. Vivolo, T. Mondal, Grzegorz Zarnecki, S. Choubey, M. Mattiazzi, O. Vallmajó, Erin O’Sullivan, S. Cuen-Rochin, S. Arimoto, S. Wronka, Miroslav Cieslar, Nikolay Ivanov Kolev, C. M. Schloesser, M. Cicerchia, A. Minamino, Magdalena Dobrzyńska, A. Bubak, R. Elmansali, K. Lachner, Reetanjali Moharana, Prantik Sarmah, S. Zsoldos, S. Izumiyama, Ł. Stawarz, P. Rajda, Satoshi Kodama, Nobuhiko Onda, E. Drakopoulou, A. Marinelli, W. Saenz, K. Skwarczynski, B. Popov, T. Katori, M. Sapinski, Grzegorz Pastuszak, C. Mariani, Ernesto Amato, S. Cebrián, R. 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Mezzetto, Y. Nakajima, A. Studenikin, R. Leitner, J. Park, P. Jonsson, Y. Maekawa, R. Kralik, D. Karlen, F. J. De Cos, E. A. Chucuan Martinez, T. Nosek, K. Graham, Y. Asaoka, D. Ferlewicz, J. Feng, K. Yamauchi, J. J. Gomez-Cadenas, T. Yano, K. Martens, J. Rimmer, T. C. Dieminger, A. El Kaftaoui, Y. Suzuki, M. Gouighri, G. A. Fiorentini Aguirre, J. Marzec, P. M. M. Boistier, A. Santos, R. Vogelaar, J. Tseng, E. Roig-Tormo, K. Nakagiri, L. Cid Barrio, S. Emery, E. Harvey-Fishenden, T. Ishida, S. Urano, T. Zhu, N. C. Hastings, J. Yoo, D. Wark, M. Rescigno, G. Ricciardi, W. Idrissi Ibnsalih, M. Matusiak, F. Maroufkhani, C. S. Moon, C. Garde, L. Marti, M. Ziembicki, K. D. Nakamura, T. Lindner, Y. Alj Hakim, Y. Fukuda, M. Yokoyama, M. Mandal, P. Spradlin, S. Yousefnejad, A. Taketa, E. Kwon, L. Morescalchi, Y. Yoshioka, E. Miller, L. Kormos, N. Tran, B. Ferrazzi, M. F. Romo-Fuentes, S. Hayashida, K. Zietara, S. Levorato, J. Y. Kim, C. Pate, F. Orozco-Luna, A. Dergacheva, Y. Fujii, B. 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article en

Abstract

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 $$5\sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mi>σ</mml:mi> </mml:mrow> </mml:math> 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 $$5\sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>5</mml:mn> <mml:mi>σ</mml:mi> </mml:mrow> </mml:math> C.L. is possible for more than 60% of the actual values of the CP-violating phase, $$\delta _{CP}.$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>δ</mml:mi> <mml:mrow> <mml:mi>CP</mml:mi> </mml:mrow> </mml:msub> <mml:mo>.</mml:mo> </mml:mrow> </mml:math> Moreover, we will measure $$\delta _{CP}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>δ</mml:mi> <mml:mrow> <mml:mi>CP</mml:mi> </mml:mrow> </mml:msub> </mml:math> with a precision ranging from 20 $$^{\circ },$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> <mml:mo>,</mml:mo> </mml:mrow> </mml:math> in the case of maximal CP violation, to 6 $$^{\circ },$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mo>∘</mml:mo> </mml:mmultiscripts> <mml:mo>,</mml:mo> </mml:mrow> </mml:math> in the case of CP conservation. We aim to achieve a 0.5% resolution on the $$\Delta m^2_{32}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mn>32</mml:mn> <mml:mn>2</mml:mn> </mml:msubsup> </mml:mrow> </mml:math> parameter, and a resolution between 3% and 0.5% on the $$\sin ^2\theta _{23}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mo>sin</mml:mo> <mml:mn>2</mml:mn> </mml:msup> <mml:msub> <mml:mi>θ</mml:mi> <mml:mn>23</mml:mn> </mml:msub> </mml:mrow> </mml:math> 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.

The European Physical Journal CVol. 86(2)
University of Pisa (IT), Warsaw University of Technology (PL), University of Geneva (CH), Louisiana State University (US), Universitat Autònoma de Barcelona (ES), Uppsala University (SE), Mohammed V University (MA), Jagiellonian University (PL), Tezpur University (IN), Rutherford Appleton Laboratory (GB), University of Salerno (IT), Indian Institute of Technology Guwahati (IN), Institute of International Education (US), University of Wisconsin–Madison (US), University of Padua (IT), High Energy Accelerator Research Organization (JP), Seoul National University (KR), École Polytechnique (FR), Indian Institute of Technology Kharagpur (IN), University of Liverpool (GB), Miyagi University of Education (JP), Indian Institute of Technology Jodhpur (IN), Dongshin University (KR), Stockholm University (SE), Okayama University (JP), Universidad de Oviedo (ES), The University of Melbourne (AU), British Columbia Institute of Technology (CA), Yokohama National University (JP), King's College London (GB), University of Toronto (CA), Institute for High Energy Physics (ES), York University (CA), Universidad de Guadalajara (MX), University of Regina (CA), Universidade de Santiago de Compostela (ES), The Graduate University for Advanced Studies, SOKENDAI (JP), Tohoku University (JP), National Centre of Scientific Research "Demokritos" (GR), Keio University (JP), University of Victoria (CA), Kyoto University (JP), University of Utah (US), Universitat de Girona (ES), Universidad de Zaragoza (ES), Pontifícia Universidade Católica do Rio de Janeiro (BR), Université Paris-Saclay (FR), Australian Regenerative Medicine Institute (AU), Japan Proton Accelerator Research Complex (JP), Italian Aerospace Research Centre (IT), University of California System (US), Université Ibn-Tofail (MA), Kyiv National University of Technologies and Design (UA), Kyungpook National University (KR), ETH Zurich (CH), Gwangju Institute of Science and Technology (KR), University of Warwick (GB), Sorbonne Université (FR), University of Oxford (GB), Shanghai Institute for Science of Science (CN), Institute for Theoretical Physics and Modeling (AM), Chonnam National University Hospital (KR), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), International Planned Parenthood Federation (IN), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Nippon Soken (Japan) (JP), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), The Polytechnic University of Japan (JP), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Canfranc Underground Laboratory (ES), Université Mohammed VI Polytechnique (MA), Nicolaus Copernicus Astronomical Center (PL), ORCID (US), Astronomy and Space (AU), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Quantum Technologies (Sweden) (SE), University of Toyama (JP), Osaka Metropolitan University (JP), Laboratoire Médiations (FR), Institute of Science Tokyo (JP), University of Warsaw (PL), Imperial College London (GB), Donostia International Physics Center (ES), Ulsan National Institute of Science and Technology (KR), Monash University (AU), Universitat Politècnica de València (ES), Nagoya University (JP), Universidad Autónoma de Madrid (ES), Kobe University (JP), Carleton University (CA), Lancaster University (GB), AGH University of Krakow (PL), Polytechnic University of Bari (IT), Tokyo Metropolitan University (JP), Palacký University Olomouc (CZ), University of Naples Federico II (IT), The University of Tokyo (JP), S.N. Bose National Centre for Basic Sciences (IN), University of Glasgow (GB), Tokyo International University (JP), Sungkyunkwan University (KR), Virginia Tech (US), University of Silesia in Katowice (PL), KTH Royal Institute of Technology (SE), The University of Winnipeg (CA), RWTH Aachen University (DE), University of Sheffield (GB), Tecnológico de Monterrey (MX), University of Hassan II Casablanca (MA)
National Science Foundation, Univerzita Karlova v Praze, CERN, UK Research and Innovation, Centres de Recerca de Catalunya, Leverhulme Trust, European Commission, National Research Foundation, Ministry of Education, Culture, Sports, Science and Technology, Branco Weiss Fellowship – Society in Science, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Generalitat de Catalunya, Conselho Nacional de Desenvolvimento Científico e Tecnológico, National Research Foundation of Korea, Ministerstwo Edukacji i Nauki, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Horizon 2020 Framework Programme, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules
Openalex Percentile: Top 45%
Neutrino Physics Research
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