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Scientific article
Open access
English

Search for heavy neutrinos with the T2K near detector ND280

ContributorsT2K Collaboration
Published inPhysical review. D, vol. 100, no. 5, 052006
Publication date2019-09-10
First online date2019-09-10
Abstract

This paper reports on the search for heavy neutrinos with masses in the range 140<493  MeV/c2 using the off-axis near detector ND280 of the T2K experiment. These particles can be produced from kaon decays in the standard neutrino beam and then subsequently decay in ND280. The decay modes under consideration are N→ℓα±π∓ and N→ℓα+ℓβ-ν(−)(α,β=e,μ). A search for such events has been made using the Time Projection Chambers of ND280, where the background has been reduced to less than two events in the current dataset in all channels. No excess has been observed in the signal region. A combined Bayesian statistical approach has been applied to extract upper limits on the mixing elements of heavy neutrinos to electron-, muon- and tau- flavored currents (Ue2, Uμ2, Uτ2) as a function of the heavy neutrino mass, e.g., Ue2<10-9 at 90% C.L. for a mass of 390  MeV/c2. These constraints are competitive with previous experiments.

eng
Keywords
  • Particle Physics Experiments
  • Neutrino: heavy: search for
  • Neutrino: mass
  • Neutrino/mu: secondary beam
  • K: decay
  • Near detector
  • J-PARC Lab
  • KAMIOKANDE
  • Time projection chamber
  • Neutrino: decay modes
  • Statistical
  • Background
  • Statistical analysis: Bayesian
  • Neutrino: mixing
  • Mass dependence
  • Data analysis method
  • 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 heavy neutrinos with the T2K near detector ND280. In: Physical review. D, 2019, vol. 100, n° 5, p. 052006. doi: 10.1103/physrevd.100.052006
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Article (Published version)
Identifiers
ISSN of the journal2470-0010
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