@article{042b1071b45a412396be97c119aa587c,
title = "Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam",
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.",
author = "{The T2K Collaboration} and K. Abe and R. Akutsu and A. Ali and C. Alt and C. Andreopoulos and L. Anthony and M. Antonova and S. Aoki and A. Ariga and Y. Asada and Y. Ashida and Atkin, {E. T.} and Y. Awataguchi and S. Ban and M. Barbi and Barker, {G. J.} and G. Barr and D. Barrow and C. Barry and M. Batkiewicz-Kwasniak and A. Beloshapkin and F. Bench and V. Berardi and S. Berkman and L. Berns and S. Bhadra and S. Bienstock and A. Blondel and S. Bolognesi and B. Bourguille and Boyd, {S. B.} and D. Brailsford and A. Bravar and {Bravo Bergu{\~n}o}, D. and C. Bronner and A. Bubak and {Buizza Avanzini}, M. and J. Calcutt and T. Campbell and S. Cao and Cartwright, {S. L.} and Catanesi, {M. G.} and A. Cervera and A. Chappell and C. Checchia and D. Cherdack and N. Chikuma and {Di Lodovico}, F. and T. Katori and Wilson, {J. R.}",
year = "2020",
month = apr,
day = "24",
doi = "10.1103/PhysRevLett.124.161802",
language = "English",
volume = "124",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society (APS)",
number = "16",
}