Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam



Abe, K, Akutsu, R, Ali, A, Alt, C, Andreopoulos, C ORCID: 0000-0003-2020-8215, Anthony, L, Antonova, M, Aoki, S, Ariga, A, Asada, Y
et al (show 334 more authors) (2020) Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam PHYSICAL REVIEW LETTERS, 124 (16). 161802-. ISSN 0031-9007, 1079-7114

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Abstract

Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.

Item Type: Article
Additional Information: arXiv admin note: text overlap with arXiv:1910.09439
Uncontrolled Keywords: T2K Collaboration
Depositing User: Symplectic Admin
Date Deposited: 15 Jan 2020 09:33
Last Modified: 16 Jun 2026 07:45
DOI: 10.1103/PhysRevLett.124.161802
Open Access URL: https://journals.aps.org/prl/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3070626
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