Searches for lepton number violating K+ decays

The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confid...

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Main Authors:	E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, I. Neri, A. Norton, F. Petrucci, H. Wahl, A. Cotta Ramusino, A. Gianoli, E. Iacopini, G. Latino, M. Lenti, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, G. Mannocchi, S. Martellotti, M. Moulson, T. Spadaro, F. Ambrosino, T. Capussela, M. Corvino, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, E. Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, J. Engelfried, N. Estrada-Tristan, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, T. Enik, V. Falaleev, V. Kekelidze, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, S. Movchan, I. Polenkevich, Yu. Potrebenikov, S. Shkarovskiy, A. Zinchenko, S. Fedotov, E. Gushchin, A. Khotyantsev, Y. Kudenko, V. Kurochka, M. Medvedeva, A. Mefodev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, O. Yushchenko, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, H. Danielsson, N. De Simone, F. Duval, B. Döbrich, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, M. Perrin-Terrin, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, L. Iacobuzio, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin
Format:	Article
Language:	English
Published:	Elsevier 2019-10-01
Series:	Physics Letters B
Online Access:	http://www.sciencedirect.com/science/article/pii/S0370269319304988

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author	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe D. Bryman J. Fu T. Husek J. Jerhot K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson T. Spadaro F. Ambrosino T. Capussela M. Corvino D. Di Filippo P. Massarotti M. Mirra M. Napolitano G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto J. Engelfried N. Estrada-Tristan A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu T. Enik V. Falaleev V. Kekelidze A. Korotkova L. Litov D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino M. Perrin-Terrin J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski L. Iacobuzio C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano A. Sergi A. Sturgess J. Swallow H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin
spellingShingle	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe D. Bryman J. Fu T. Husek J. Jerhot K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson T. Spadaro F. Ambrosino T. Capussela M. Corvino D. Di Filippo P. Massarotti M. Mirra M. Napolitano G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto J. Engelfried N. Estrada-Tristan A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu T. Enik V. Falaleev V. Kekelidze A. Korotkova L. Litov D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino M. Perrin-Terrin J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski L. Iacobuzio C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano A. Sergi A. Sturgess J. Swallow H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin Searches for lepton number violating K+ decays Physics Letters B
author_facet	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe D. Bryman J. Fu T. Husek J. Jerhot K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson T. Spadaro F. Ambrosino T. Capussela M. Corvino D. Di Filippo P. Massarotti M. Mirra M. Napolitano G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto J. Engelfried N. Estrada-Tristan A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu T. Enik V. Falaleev V. Kekelidze A. Korotkova L. Litov D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino M. Perrin-Terrin J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski L. Iacobuzio C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano A. Sergi A. Sturgess J. Swallow H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin
author_sort	E. Cortina Gil
title	Searches for lepton number violating K+ decays
title_short	Searches for lepton number violating K+ decays
title_full	Searches for lepton number violating K+ decays
title_fullStr	Searches for lepton number violating K+ decays
title_full_unstemmed	Searches for lepton number violating K+ decays
title_sort	searches for lepton number violating k+ decays
publisher	Elsevier
series	Physics Letters B
issn	0370-2693
publishDate	2019-10-01
description	The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.
url	http://www.sciencedirect.com/science/article/pii/S0370269319304988
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spelling	doaj-a2c6362fd6fd4e008b8c1f0ba87f43a82020-11-25T00:57:17ZengElsevierPhysics Letters B0370-26932019-10-01797Searches for lepton number violating K+ decaysE. Cortina Gil0A. Kleimenova1E. Minucci2S. Padolski3P. Petrov4A. Shaikhiev5R. Volpe6T. Numao7Y. Petrov8B. Velghe9D. Bryman10J. Fu11T. Husek12J. Jerhot13K. Kampf14M. Zamkovsky15R. Aliberti16G. Khoriauli17J. Kunze18D. Lomidze19L. Peruzzo20M. Vormstein21R. Wanke22P. Dalpiaz23M. Fiorini24I. Neri25A. Norton26F. Petrucci27H. Wahl28A. Cotta Ramusino29A. Gianoli30E. Iacopini31G. Latino32M. Lenti33A. Parenti34A. Bizzeti35F. Bucci36A. Antonelli37G. Georgiev38V. Kozhuharov39G. Lanfranchi40G. Mannocchi41S. Martellotti42M. Moulson43T. Spadaro44F. Ambrosino45T. Capussela46M. Corvino47D. Di Filippo48P. Massarotti49M. Mirra50M. Napolitano51G. Saracino52G. Anzivino53F. Brizioli54E. Imbergamo55R. Lollini56R. Piandani57C. Santoni58M. Barbanera59P. Cenci60B. Checcucci61P. Lubrano62M. Lupi63M. Pepe64M. Piccini65F. Costantini66L. Di Lella67N. Doble68M. Giorgi69S. Giudici70G. Lamanna71E. Lari72E. Pedreschi73M. Sozzi74C. Cerri75R. Fantechi76L. Pontisso77F. Spinella78I. Mannelli79G. D'Agostini80M. Raggi81A. Biagioni82E. Leonardi83A. Lonardo84P. Valente85P. Vicini86R. Ammendola87V. Bonaiuto88A. Fucci89A. Salamon90F. Sargeni91R. Arcidiacono92B. Bloch-Devaux93M. Boretto94E. Menichetti95E. Migliore96D. Soldi97C. Biino98A. Filippi99F. Marchetto100J. Engelfried101N. Estrada-Tristan102A.M. Bragadireanu103S.A. Ghinescu104O.E. Hutanu105T. Enik106V. Falaleev107V. Kekelidze108A. Korotkova109L. Litov110D. Madigozhin111M. Misheva112N. Molokanova113S. Movchan114I. Polenkevich115Yu. Potrebenikov116S. Shkarovskiy117A. Zinchenko118S. Fedotov119E. Gushchin120A. Khotyantsev121Y. Kudenko122V. Kurochka123M. Medvedeva124A. Mefodev125S. Kholodenko126V. Kurshetsov127V. Obraztsov128A. Ostankov129V. Semenov130V. Sugonyaev131O. Yushchenko132L. Bician133T. Blazek134V. Cerny135Z. Kucerova136J. Bernhard137A. Ceccucci138H. Danielsson139N. De Simone140F. Duval141B. Döbrich142L. Federici143E. Gamberini144L. Gatignon145R. Guida146F. Hahn147E.B. Holzer148B. Jenninger149M. Koval150P. Laycock151G. Lehmann Miotto152P. Lichard153A. Mapelli154R. Marchevski155K. Massri156M. Noy157V. Palladino158M. Perrin-Terrin159J. Pinzino160V. Ryjov161S. Schuchmann162S. Venditti163T. Bache164M.B. Brunetti165V. Duk166V. Fascianelli167J.R. Fry168F. Gonnella169E. Goudzovski170L. Iacobuzio171C. Lazzeroni172N. Lurkin173F. Newson174C. Parkinson175A. Romano176A. Sergi177A. Sturgess178J. Swallow179H. Heath180R. Page181S. Trilov182B. Angelucci183D. Britton184C. Graham185D. Protopopescu186J. Carmignani187J.B. Dainton188R.W.L. Jones189G. Ruggiero190L. Fulton191D. Hutchcroft192E. Maurice193B. Wrona194A. Conovaloff195P. Cooper196D. Coward197P. Rubin198Université Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumTRIUMF, Vancouver, British Columbia, CanadaTRIUMF, Vancouver, British Columbia, CanadaTRIUMF, Vancouver, British Columbia, CanadaUniversity of British Columbia, Vancouver, British Columbia, CanadaUniversity of British Columbia, Vancouver, British Columbia, CanadaCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of excellence, Universität Mainz, Mainz, GermanyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Astronomia dell'Università e INFN, Sezione di Firenze, Sesto Fiorentino, ItalyDipartimento di Fisica e Astronomia dell'Università e INFN, Sezione di Firenze, Sesto Fiorentino, ItalyDipartimento di Fisica e Astronomia dell'Università e INFN, Sezione di Firenze, Sesto Fiorentino, ItalyDipartimento di Fisica e Astronomia dell'Università e INFN, Sezione di Firenze, Sesto Fiorentino, ItalyINFN, Sezione di Firenze, Sesto Fiorentino, ItalyINFN, Sezione di Firenze, Sesto Fiorentino, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica e Geologia dell'Università e INFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyINFN, Sezione di Perugia, Perugia, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyScuola Normale Superiore e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma I, Roma, ItalyDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoHoria Hulubei national Institute of Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei national Institute of Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei national Institute of Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaJoint Institute for Nuclear Research, Dubna, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaInstitute for High Energy Physics – State Research Center of Russian Federation, Protvino, RussiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomCorresponding author.; University of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Birmingham, Birmingham, United KingdomUniversity of Bristol, Bristol, United KingdomUniversity of Bristol, Bristol, United KingdomUniversity of Bristol, Bristol, United KingdomUniversity of Glasgow, Glasgow, United KingdomUniversity of Glasgow, Glasgow, United KingdomUniversity of Glasgow, Glasgow, United KingdomUniversity of Glasgow, Glasgow, United KingdomUniversity of Lancaster, Lancaster, United KingdomUniversity of Lancaster, Lancaster, United KingdomUniversity of Lancaster, Lancaster, United KingdomUniversity of Lancaster, Lancaster, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomGeorge Mason University, Fairfax, VA, USAGeorge Mason University, Fairfax, VA, USAGeorge Mason University, Fairfax, VA, USAGeorge Mason University, Fairfax, VA, USAThe NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.http://www.sciencedirect.com/science/article/pii/S0370269319304988

Searches for lepton number violating K+ decays

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