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

Abe, K. and Akutsu, R. and Alt, C. and Andreopoulos, C. and Antonova, M. and Aoki, S. and Ariga, A. and Asada, Y. and Ashida, Y. and Atkin, E. T. and Awataguchi, Y. and Ban, S. and Barbi, M. and Barker, G. J. and Barr, G. and Barry, C. and Batkiewicz-Kwasniak, M. and Beloshapkin, A. and Bench, F. and Berardi, V. and Berkman, S. and Berns, L. and Bhadra, S. and Bienstock, S. and Blondel, A. and Bolognesi, S. and Bourguille, B. and Brailsford, D. and Bravar, A. and Berguno, D. Bravo and Bronner, C. and Bubak, A. and Avanzini, M. Buizza and Calcutt, J. and Campbell, T. and Cao, S. and Catanesi, M. G. and Cervera, A. and Chappell, A. and Checchia, C. and Dealtry, T. and Doyle, T. A. and Finch, A. J. and Knox, A. and Kormos, L. L. and Lawe, M. and Nowak, J. and O'Keeffe, H. M. and Ratoff, P. N. and Walsh, J. G. (2020) Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam. Physical review letters, 124. ISSN 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 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
142699
Deposited By:
Deposited On:
30 Mar 2020 15:20
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2020 06:19