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

Research output: Contribution to journalArticle

The T2K Collaboration

Original languageEnglish
Article number161802
JournalPhysical Review Letters
Volume124
Issue number16
DOIs
Publication statusPublished - 24 Apr 2020

King's Authors

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.

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