Neutrino oscillations: status and prospects for the determination of neutrino mass ordering and the leptonic <i>CP</i>-violation phase

L.D. Kolupaeva^†, M.O. Gonchar^‡, A.G. Ol’shevskii^§, O.B. Samoylov^*
Joint Institute for Nuclear Research, 6 Joliot-Curie Str., Dubna, Moscow Region, 141980, Russian Federation

This review is devoted to the 110th anniversary of the birth of Bruno Pontecorvo, an outstanding physicist who made an invaluable contribution to the development of modern neutrino physics, having predicted, inter alia, nonzero neutrino masses, mixing, and oscillations that were experimentally discovered in the early 2000s. Significant progress has been made over 20 years of experiments in determining the parameters of three-flavor neutrino oscillations. The status of and prospects for establishing neutrino mass ordering and the leptonic CP-violation phase δ_CP, unknown parameters of this theory, are discussed. It is expected that they will be measured in long-baseline experiments in the next decade. The ongoing accelerator experiments NOvA and T2K, which are currently the most sensitive to neutrino mass ordering and δ_CP, are described in detail. For ease of comparison, NOvA and T2K techniques and results, including all aspects of data collection and analysis, are presented on a stage-by-stage basis. Possible reasons for the disagreement between the δ_CP values measured by NOvA and T2K are discussed. Future accelerator (DUNE and Hyper-Kamiokande) and reactor (JUNO) megaprojects are considered, along with experiments designed to use atmospheric neutrinos: IceCube Upgrade, KM3NeT (ORCA), and ICAL at INO, which can measure unknown oscillation parameters and refine the ones already determined.

Keywords: neutrinos, neutrino oscillations, mass hierarchy, leptonic CP violation, accelerator neutrinos, reactor neutrinos, atmospheric neutrinos, solar neutrinos
PACS: 14.60.Lm, 14.60.Pq (all)
DOI: 10.3367/UFNe.2022.05.039191
URL: https://ufn.ru/en/articles/2023/8/a/
Web of Science

001112646900001
Scopus

2-s2.0-85180122709
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2023PhyU...66..753K
Citation: Kolupaeva L D, Gonchar M O, Ol’shevskii A G, Samoylov O B "Neutrino oscillations: status and prospects for the determination of neutrino mass ordering and the leptonic CP-violation phase" Phys. Usp. 66 753–774 (2023)

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Received: 17th, January 2022, revised: 5th, May 2022, accepted: 16th, May 2022

Оригинал: Колупаева Л Д, Гончар М О, Ольшевский А Г, Самойлов О Б «Осцилляции нейтрино: статус и перспективы определения порядка нейтринных масс и фазы нарушения лептонной CP-инвариантности» УФН 193 801–824 (2023); DOI: 10.3367/UFNr.2022.05.039191

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