Search for heavy neutral leptons in <math altimg="si1.svg"><msup><mi>π</mi><mo>+</mo></msup></math> decays to positrons
(2026) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 872 (2026)
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- et. al.
- Abstract
- A search for heavy neutral lepton (N) production in <math altimg="si8.svg"><mrow><msup><mi>π</mi><mo>+</mo></msup><mo>→</mo><msup><mi>e</mi><mo>+</mo></msup><mi>N</mi></mrow></math> in-flight decays using data collected by the NA62 experiment at CERN in 2017–2024 is reported. Upper limits for the extended neutrino mixing matrix element |Ue4|<sup loc="post">2</sup> are established at the level of <math altimg="si19.svg"><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup></math> for heavy neutral leptons with mass in the range 95–126 MeV/c<sup loc="post">2</sup> and lifetime exceeding 50 ns.
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Citations
Cortina Gil, E., Minucci, E., Padolski, S., Rumenov Petrov, P., Lurkin, N., NA62, & et al. (2026). Search for heavy neutral leptons in <math altimg=“si1.svg”><msup><mi>π</mi><mo>+</mo></msup></math> decays to positrons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 872. https://doi.org/10.1016/j.physletb.2025.140119 (Original work published 2026)