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

Research output: Contribution to journalJournal article

Published
Article number161802
<mark>Journal publication date</mark>21/04/2020
<mark>Journal</mark>Physical review letters
Volume124
Number of pages8
Publication statusPublished
Original languageEnglish

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 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 2.40{\sigma} 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.