abstract

• The NA62 experiment at CERN reports searches for K%2b→μ%2bN and K%2b→μ%2bνX decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10−8) of the neutrino mixing parameter |Uμ4|2 for N masses in the range 200–384 MeV/c2 and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c2 are reported for the first time, ranging from O(10−5) to O(10−7). An improved upper limit of 1.0×10−6 is established at 90%25 CL on the K%2b→μ%2bννν¯ branching fraction. © 2021 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.
• The NA62 Collaboration
• 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

• 2021-01-01

funding provided via

• UNCE/SCI/013; National Science Foundation, NSF: 1506088, 1806430; Biomedical Engineering Society, BMES; National Research Centre, NRC; CERN; Ministère de l’Enseignement Supérieur et de la Recherche Scientifique, MESRS; National Research Council, NRC; Natural Sciences and Engineering Research Council of Canada, NSERC: SAPPJ-2018-0017; Science and Technology Facilities Council, STFC: ST/J00412X/1, ST/M005798/1; Royal Society: UF0758946, UF100308; European Research Council, ERC: 268062, 336581, 802836; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT; Russian Foundation for Basic Research, РФФИ: 18-32-00072, 18-32-00245; Bundesministerium für Bildung und Forschung, BMBF: 05H12UM5, 05H15UMCNA, 05H18UMCNA; Fonds De La Recherche Scientifique - FNRS, FNRS; Russian Academy of Sciences, РАН; Consejo Nacional de Ciencia y Tecnología, CONACYT; Ministry of Education, Youth and Science, MEYS; Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR: RBFR12JF2Z; Ministry of Education and Science of the Russian Federation, Minobrnauka; Joint Institute for Nuclear Research, JINR; Instituto Nazionale di Fisica Nucleare, INFN; Russian Science Foundation, RSF: RSF 19-72-10096; Horizon 2020: 701386, 842407, 893101; Institutul de Fizică Atomică, IFA: 1/16.03.2016, PN 19 06 01 04  Grant

published in

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

keywords

Digital Object Identifier (DOI)

• 10.1016/j.physletb.2021.136259

PubMed ID

start page

end page

volume

• 816

issue