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

Abe, K. ; Afif, M. T. ; Anthony, L. ; Araya, A. ; Arguello Quiroga, A. ; Arimoto, S. ; Batkiewicz-Kwasniak, M. ; Beauchêne, A. ; Casado, M. P. ; Catanesi, M. G. ; Cavanagh, C. ; Cebrián, S. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

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

Año: 2026

Publicado en: The European Physical Journal C 86, 2 (2026), [18 pp.]
ISSN: 1434-6044

Financiación: info:eu-repo/grantAgreement/ES/MCIU/PID2022-139198NB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-124050NB-C31
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2022-136297NB-I00
Financiación: info:eu-repo/grantAgreement/ES/NextGenerationEU/PRTR

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)