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.
Search for heavy neutral leptons in π + decays to positrons / Bloch-Devaux, B., Cortina Gil, E., Lurkin, N., Minucci, E., Padolski, S., Petrov, P., Numao, T., Petrov, Y., Shang, V., Velghe, B., Wong, V.W.S., Bryman, D., Fu, J., Bician, L., Hives, Z., Husek, T., Kampf, K., Kolesar, M., Koval, M., De Martino, B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 872:(2026), pp. 140119.0-140119.0. [10.1016/j.physletb.2025.140119]
Search for heavy neutral leptons in π + decays to positrons
Minucci, E.;De Martino, B.;Di Lella, L.;Canale, N.;Bucci, F.
;Iacopini, E.
;Latino, G.
;Lenti, M.
;Panichi, I.
;Ruggiero, G.
;Corvino, M.;Fiorenza, R.;Cerri, C.;Fantechi, R.;Lari, E.;Mannelli, I.;Leonardi, E.;Turisini, M.;Vicini, P.;D'Agostini, G.;Migliore, E.;De Simone, N.;Guida, R.;Marchevski, R.;Sergi, A.;Graham, C.;
2026
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.
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