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. Perrin-Terrin M. Petit L. Döbrich B. Jerhot J. Lezki S. Schubert J. Akmete A.T. Aliberti R. Ceoletta M. Di Lella L. Doble N. Khoriauli G. Kunze J. Lomidze D. Peruzzo L. Polivka C. Schuchmann S. Vormstein M. Wahl H. Wanke R. Bandiera L. Canale N. Gianoli A. Romagnoni M. Dalpiaz P. Fiorini M. Negrello R. Neri I. Petrucci F. Bizzeti A. Bucci F. Iacopini E. Latino G. Lenti M. Lo Chiatto P. Panichi I. Parenti A. Ruggiero G. Antonelli A. Georgiev G. Kozhuharov V. Lanfranchi G. Martellotti S. Moulson M. Plini L. Soldani M. Spadaro T. Swallow J. Tinti G. Ambrosino F. Capussela T. Corvino M. DErrico M. Di Filippo D. Fiorenza R. Francesconi M. Giordano R. Massarotti P. Mirra M. Napolitano M. Rosa I. Saracino G. Barbanera M. Cenci P. Checcucci B. Duk V. Falaleev V. Lubrano P. Lupi M. Pepe M. Piccini M. Anzivino G. Imbergamo E. Lollini R. Santoni C. Cerri C. Fantechi R. Kholodenko S. Spinella F. Costantini F. Giorgi M. Giudici S. Lamanna G. Lari E. Pedreschi E. Pinzino J. Sozzi M. Mannelli I. Biagioni A. Cretaro P. Frezza O. Leonardi E. Lonardo A. Pontisso L. Turisini M. Valente P. Vicini P. DAgostini G. Raggi M. Ammendola R. Bonaiuto V. Fucci A. Salamon A. Sargeni F. Biino C. Filippi A. Marchetto F. Arcidiacono R. Menichetti E. Migliore E. Soldi D. Mukhamejanov Y. Mukhamejanova A. Saduyev N. Sakhiyev S. Briano Olvera A. Engelfried J. Estrada-Tristan N. Piandani R. Reyes Santos M.A. Rodriguez Rivera K.A. Boboc P. Bragadireanu A.M. Ghinescu S.A. Hutanu O.E. Blazek T. Cerny V. Velas T. Volpe R. Bernhard J. Boretto M. Brizioli F. Ceccucci A. Danielsson H. De Simone N. Duval F. Federici L. Gamberini E. Guida R. Hahn F. Holzer E.B. Jenninger B. Kucerova Z. Laycock P. Lehmann Miotto G. Lichard P. Mapelli A. Noy M. Palladino V. Ryjov V. Venditti S. Zamkovsky M. Chang X. Kleimenova A. Marchevski R. Bache T. Brunetti M.B. Fascianelli V. Fry J.R. Gonnella F. Goudzovski E. Henshaw J. Iacobuzio L. Kenworthy C. Lazzeroni C. Newson F. Parkinson C. Romano A. Sam C. Sanders J. Sergi A. Sturgess A. Tomczak A. Heath H. Page R. Trilov S. Angelucci B. Britton D. Graham C. Norton A. Protopopescu D. Carmignani J. Dainton J.B. Gatignon L. Jones R.W.L. Massri K. Shaikhiev A. Fulton L. Hutchcroft D. Maurice E. Wrona B. Conovaloff A. Cooper P. Coward D. Rubin P. Baeva A. Baigarashev D. Bautin V. Emelyanov D. Enik T. Gorshanov K. Kekelidze V. Kereibay D. Korotkova A. Litov L. Madigozhin D. Misheva M. Molokanova N. Movchan S. Okhotnikov A. Polenkevich I. Potrebenikov Y. Sadovskiy A. Salamatin K. Shkarovskiy S. Zinchenko A. Fedotov S. Gushchin E. Khotyantsev A. Kudenko Y. Kurochka V. Kurshetsov V. Medvedeva M. Mefodev A. Obraztsov V. Ostankov A. Semenov V. Sugonyaev V. Yushchenko O.
January 2026Elsevier B.V.

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
2026#872

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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Also at School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
Present address: INFN, Laboratori Nazionali di Frascati, Frascati, I-00044, Italy
Also at TRIUMF, Vancouver, V6T 2A3, BC, Canada
Also at Université de Toulon, Aix Marseille University, NRS, IM2NP, La Garde, F-83957, France
Also at Department of Physics, Technical University of Munich, München, D-80333, Germany
Present address: Institut für Kernphysik and Helmholtz Institute Mainz, Universität Mainz, Mainz, D-55099, Germany
Also at CERN, European Organization for Nuclear Research, Geneva 23, CH-1211, Switzerland
Present address: Universität Würzburg, Würzburg, D-97070, Germany
Present address: European XFEL GmbH, Schenefeld, D-22869, Germany
Also at Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, Modena, I-41125, Italy
Present address: Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Garching, D-85748, Germany
Also at Faculty of Physics, University of Sofia, Sofia, BG-1164, Bulgaria
Also at INFN, Sezione di Roma I e Dipartimento di Fisica, Sapienza Università di Roma, Roma, I-00185, Italy
Present address: INFN, Sezione di Napoli e Scuola Superiore Meridionale, Napoli, I-80138, Italy
Present address: CERN, European Organization for Nuclear Research, Geneva 23, CH-1211, Switzerland
Also at Department of Industrial Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
Also at Department of Electronic Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
Also at Gran Sasso Science Institute, LAquila, I-67100, Italy
Also at Università degli Studi del Piemonte Orientale, Vercelli, I-13100, Italy
Also at al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Also at Universidad de Guanajuato, Guanajuato, 36000, Mexico
Present address: INFN, Sezione di Perugia, Perugia, I-06100, Italy
Present address: DESY, Zeuthen, D-15738, Germany
Present address: IPHC, CNRS/IN2P3, Strasbourg University, Strasbourg, F-67037, France
Present address: Brookhaven National Laboratory, Upton, NY 11973, United States
Present address: Kansas University, Lawrence, KS 66045-7582, United States
Present address: Center for theoretical neuroscience, Columbia University, New York, NY 10027, United States
Present address: INFN, Sezione di Genova e Dipartimento di Fisica dell Università, Genova, I-16146, Italy
Present address: School of Physical Sciences, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
Present address: Laboratoire Leprince Ringuet, Palaiseau, F-91120, France
Also at SLAC National Accelerator Laboratory, Stanford University, Menlo Park, CA 94025, United States
Also at L. N. Gumilyov Eurasian National University, Nur-Sultan, 010000, Kazakhstan
Present address: Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS), Sofia, BG-1784, Bulgaria
Department of Industrial Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
Department of Electronic Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
INFN, Sezione di Torino, Torino, Italy
Gran Sasso Science Institute, LAquila, I-67100, Italy
INFN, Sezione di Torino e Dipartimento di Fisica dellUniversità, Torino, Italy
Università degli Studi del Piemonte Orientale, Vercelli, I-13100, Italy
Institute of Nuclear Physics, Almaty, Kazakhstan
al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
Universidad de Guanajuato, Guanajuato, 36000, Mexico
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, Romania
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
CERN, European Organization for Nuclear Research, Geneva, Switzerland
DESY, Zeuthen, D-15738, Germany
IPHC, CNRS/IN2P3, Strasbourg University, Strasbourg, F-67037, France
Brookhaven National Laboratory, Upton, 11973, NY, United States
Ecole Polytechnique Fédérale Lausanne, Lausanne, Switzerland
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
Kansas University, Lawrence, 66045-7582, KS, United States
Center for Theoretical Neuroscience, Columbia University, New York, 10027, NY, United States
INFN, Sezione di Genova e Dipartimento di Fisica dellUniversità, Genova, I-16146, Italy
School of Physics, University of Bristol, Bristol, United Kingdom
School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
Physics Department, University of Lancaster, Lancaster, United Kingdom
School of Physical Sciences, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
School of Physical Sciences, University of Liverpool, Liverpool, United Kingdom
Laboratoire Leprince Ringuet, Palaiseau, F-91120, France
Physics and Astronomy Department, George Mason University, Fairfax, VA, United States
SLAC National Accelerator Laboratory, Stanford University, Menlo Park, 94025, CA, United States
International Laboratory covered by a cooperation agreement with CERN
L. N. Gumilyov Eurasian National University, Nur-Sultan, 010000, Kazakhstan
Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS), Sofia, BG-1784, Bulgaria
Institute formerly covered by a cooperation agreement with CERN

Also at School of Physics and Astronomy
Present address: INFN
Also at TRIUMF
Also at Université de Toulon
Also at Department of Physics
Present address: Institut für Kernphysik and Helmholtz Institute Mainz
Also at CERN
Present address: Universität Würzburg
Present address: European XFEL GmbH
Also at Dipartimento di Scienze Fisiche
Present address: Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)
Also at Faculty of Physics
Also at INFN
Present address: INFN
Present address: CERN
Also at Department of Industrial Engineering
Also at Department of Electronic Engineering
Also at Gran Sasso Science Institute
Also at Università degli Studi del Piemonte Orientale
Also at al-Farabi Kazakh National University
Also at Universidad de Guanajuato
Present address: INFN
Present address: DESY
Present address: IPHC
Present address: Brookhaven National Laboratory
Present address: Kansas University
Present address: Center for theoretical neuroscience
Present address: INFN
Present address: School of Physical Sciences
Present address: Laboratoire Leprince Ringuet
Also at SLAC National Accelerator Laboratory
Also at L. N. Gumilyov Eurasian National University
Present address: Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS)
Department of Industrial Engineering
Department of Electronic Engineering
INFN
Gran Sasso Science Institute
INFN
Università degli Studi del Piemonte Orientale
Institute of Nuclear Physics
al-Farabi Kazakh National University
Instituto de Física
Universidad de Guanajuato
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Faculty of Mathematics
CERN
DESY
IPHC
Brookhaven National Laboratory
Ecole Polytechnique Fédérale Lausanne
School of Physics and Astronomy
Kansas University
Center for Theoretical Neuroscience
INFN
School of Physics
School of Physics and Astronomy
Physics Department
School of Physical Sciences
School of Physical Sciences
Laboratoire Leprince Ringuet
Physics and Astronomy Department
SLAC National Accelerator Laboratory
International Laboratory covered by a cooperation agreement with CERN
L. N. Gumilyov Eurasian National University
Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS)
Institute formerly covered by a cooperation agreement with CERN

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