abstract

• A search for heavy neutral lepton (N) production in K →e N decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element |Ue4|2 are established at the level of 10−9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/c2, with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The |Ue4|2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c2. © 2020 The Author(s)
• A search for heavy neutral lepton (N) production in K%2b→e%2bN decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element |Ue4|2 are established at the level of 10−9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/c2, with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The |Ue4|2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c2. © 2020 The Author(s)

authors

• Aliberti R.
• Ambrosino F.
• Ammendola R.
• Angelucci B.
• Antonelli A.
• Anzivino G.
• Arcidiacono R.
• Bache T.
• Baeva A.
• Baigarashev D.
• Barbanera M.
• Bernhard J.
• Biagioni A.
• Bician L.
• Biino C.
• Bizzeti A.
• Blazek T.
• Bloch-Devaux B.
• Bonaiuto V.
• Boretto M.
• Bragadireanu A.M.
• Britton D.
• Brizioli F.
• Brunetti M.B.
• Bryman D.
• Bucci F.
• Capussela T.
• Carmignani J.
• Ceccucci A.
• Cenci P.
• Cerny V.
• Cerri C.
• Checcucci B.
• Conovaloff A.
• Cooper P.
• Cortina Gil E.
• Corvino M.
• Costantini F.
• Cotta Ramusino A.
• Coward D.
• D'Agostini G.
• Dainton J.
• Dalpiaz P.
• Danielsson H.
• De Simone N.
• Di Filippo D.
• Di Lella L.
• Doble N.
• Duk V.
• Duval F.
• Döbrich B.
• Emelyanov D.
• Engelfried Jatzkowski Jurgen
• Enik T.
• Estrada-Tristan N.
• Falaleev V.
• Fantechi R.
• Fascianelli V.
• Federici L.
• Fedotov S.
• Filippi A.
• Fiorini M.
• Fry J.
• Fu J.
• Fucci A.
• Fulton L.
• Gamberini E.
• Gatignon L.
• Georgiev G.
• Ghinescu S.
• Gianoli A.
• Giorgi M.
• Giudici S.
• Gonnella F.
• Goudzovski E.
• Graham C.
• Guida R.
• Gushchin E.
• Hahn F.
• Heath H.
• Henshaw J.
• Holzer E.B.
• Husek T.
• Hutanu O.E.
• Hutchcroft D.
• Iacobuzio L.
• Iacopini E.
• Imbergamo E.
• Jenninger B.
• Jerhot J.
• Jones R.W.L.
• Kampf K.
• Kekelidze V.
• Kholodenko S.
• Khoriauli G.
• Khotyantsev A.
• Kleimenova A.
• Korotkova A.
• Koval M.
• Kozhuharov V.
• Kucerova Z.
• Kudenko Y.
• Kunze J.
• Kurochka V.
• Kurshetsov V.F.
• Lamanna G.
• Lanfranchi G.
• Lari E.
• Latino G.
• Laycock P.
• Lazzeroni C.
• Lehmann-Miotto G.
• Lenti M.
• Leonardi E.
• Lichard P.
• Litov L.
• Lollini R.
• Lomidze D.
• Lonardo A.
• Lubrano P.
• Lupi M.
• Lurkin N.
• Madigozhin D.
• Mannelli I.
• Mapelli A.
• Marchetto F.
• Marchevski R.
• Martellotti S.
• Massarotti P.
• Massri K.
• Maurice E.
• Medvedeva M.
• Mefodev A.
• Menichetti E.
• Migliore E.
• Minucci E.
• Mirra M.
• Misheva M.
• Molokanova N.
• Moulson M.
• Movchan S.
• Napolitano M.
• Neri I.
• Newson F.
• Norton A.
• Noy M.
• Numao T.
• Obraztsov V.
• Ostankov A.
• Padolski S.
• Page R.
• Palladino V.
• Parenti A.
• Parkinson C.
• Pedreschi E.
• Pepe M.
• Perrin-Terrin M.
• Peruzzo L.
• Petrov P.
• Petrov Y.
• Petrucci F.
• Piandani R.
• Piccini M.
• Pinzino J.
• Polenkevich I.
• Pontisso L.
• Potrebenikov Y.
• Protopopescu D.
• Raggi M.
• Romano A.
• Rubin P.
• Ruggiero G.
• Ryjov V.
• Salamon A.
• Santoni C.
• Saracino G.
• Sargeni F.
• Schuchmann S.
• Semenov V.
• Sergi A.
• Shaikhiev A.
• Shkarovskiy S.
• Soldi D.
• Sozzi M.
• Spadaro T.
• Spinella F.
• Sturgess A.
• Sugonyaev V.
• Swallow J.
• Trilov S.
• Valente P.
• Velghe B.
• Venditti S.
• Vicini P.
• Volpe R.
• Vormstein M.
• Wahl H.
• Wanke R.
• Wrona B.
• Yushchenko O.
• Zamkovsky M.
• Zinchenko A.

publication date

• 2020-01-01

funding provided via

• Biomedical Engineering Society, BMES  Grant
• Bundesministerium für Bildung und Forschung, BMBF: 05H12UM5, 05H15UMCNA, 05H18UMCNA  Grant
• Bundesministerium für Bildung und Frauen, BMBF  Grant
• CERN  Grant
• Consejo Nacional de Ciencia y Tecnología, CONACYT  Grant
• European Research Council, ERC: 268062, 336581, 802836  Grant
• Fonds De La Recherche Scientifique - FNRS, FNRS  Grant
• H2020 Marie Skłodowska-Curie Actions, MSCA: 701386, 842407, 893101  Grant
• Horizon 2020  Grant
• Institut national de la recherche scientifique, INRS  Grant
• Institutul de Fizică Atomică, IFA: 1/16.03.2016, PN 19 06 01 04  Grant
• Istituto Nazionale di Fisica Nucleare, INFN  Grant
• Joint Institute for Nuclear Research, JINR  Grant
• Luonnontieteiden ja Tekniikan Tutkimuksen Toimikunta: SAPPJ-2018-0017  Grant
• Ministerio de Educación, Cultura y Deporte, MECD  Grant
• Ministero dell'Istruzione, dell'Università e della Ricerca, MIUR: RBFR12JF2Z  Grant
• Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT  Grant
• Ministry of Education and Science of the Russian Federation, Minobrnauka  Grant
• Ministry of Education, Youth and Science, MEYS  Grant
• Ministère de l’Enseignement Supérieur et de la Recherche Scientifique  Grant
• National Research Council Canada, NRC  Grant
• National Science Foundation, NSF: 1506088, 1806430  Grant
• Royal Society: UF0758946, UF100308  Grant
• Russian Academy of Sciences, RAS  Grant
• Russian Foundation for Basic Research, RFBR: 18-32-00072, 18-32-00245  Grant
• Russian Science Foundation, RSF: RSF 19-72-10096  Grant
• Science and Technology Facilities Council, STFC: ST/J00412X/1, ST/M005798/1  Grant
• UNCE/SCI/013  Grant

published in

• Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics  Journal

Digital Object Identifier (DOI)

• 10.1016/j.physletb.2020.135599

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volume

• 807