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.

Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam / Abe, K., Akutsu, R., Ali, A., Alt, C., Andreopoulos, C., Anthony, L., Antonova, M., Aoki, S., Ariga, A., Asada, Y., Ashida, Y., Atkin, E.T., Awataguchi, Y., Ban, S., Barbi, M., Barker, G.J., Barr, G., Barrow, D., Barry, C., Batkiewicz-Kwasniak, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 124:16(2020). [10.1103/PhysRevLett.124.161802]

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

Berardi V.;Magaletti L.;
2020

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.
2020
Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam / Abe, K., Akutsu, R., Ali, A., Alt, C., Andreopoulos, C., Anthony, L., Antonova, M., Aoki, S., Ariga, A., Asada, Y., Ashida, Y., Atkin, E.T., Awataguchi, Y., Ban, S., Barbi, M., Barker, G.J., Barr, G., Barrow, D., Barry, C., Batkiewicz-Kwasniak, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 124:16(2020). [10.1103/PhysRevLett.124.161802]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/207927
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