@article{20df075a2a8f42208013cde120c6eb18,
title = "Search for heavy neutral leptons in π+ decays to positrons",
abstract = "A search for heavy neutral lepton (N) production in π+ → e+N 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|2 are established at the level of 10−8 for heavy neutral leptons with mass in the range 95–126 MeV/c2 and lifetime exceeding 50 ns.",
author = "\{NA62 Collaboration\} and B. Bloch-Devaux and \{Cortina Gil\}, E. and N. Lurkin and E. Minucci and S. Padolski and P. Petrov and T. Numao and Y. Petrov and V. Shang and B. Velghe and V.W.S. Wong and D. Bryman and J. Fu and L. Bician and Z. Hives and T. Husek and K. Kampf and M. Kolesar and M. Koval and \{De Martino\}, B. and M. Perrin-Terrin and L. Petit and B. D{\"o}brich and J. Jerhot and S. Lezki and J. Schubert and A.T. Akmete and H. Heath and R. Page and S. Trilov",
note = "Publisher Copyright: {\textcopyright} 2026",
year = "2025",
month = dec,
day = "26",
doi = "10.1016/j.physletb.2025.140119",
language = "English",
volume = "872",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier B.V.",
}