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

ContributorsT2K Collaboration
Published inPhysical review letters, vol. 124, no. 16, 161802
Publication date2020-04-21
First online date2020-04-21
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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Keywords
  • Elementary Particles and Fields
  • Antineutrino/mu: secondary beam
  • Antineutrino: oscillation
  • Antineutrino/e: particle identification
  • Neutrino/e: particle identification
  • Neutrino/mu: secondary beam
  • J-PARC Lab
  • KAMIOKANDE
  • Kinematics
  • Background
  • Mixing
  • Experimental results
Funding
  • European Commission - Innovative doctoral programme for talented early-stage researchers in Spanish host organisations excellent in the areas of Science, Technology, Engineering and Mathematics (STEM). [713673]
Citation (ISO format)
T2K Collaboration. Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam. In: Physical review letters, 2020, vol. 124, n° 16, p. 161802. doi: 10.1103/physrevlett.124.161802
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Article (Published version)
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ISSN of the journal0031-9007
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