Search for K+ decays into the π+e+e−e+e− final state
The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7....
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323005270 |
| _version_ | 1797632760125325312 |
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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 V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa 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 P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini 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 A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta 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 J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak 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 A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko |
| author_facet | E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa 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 P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini 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 A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta 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 J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak 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 A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko |
| author_sort | E. Cortina Gil |
| collection | DOAJ |
| description | The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−. |
| first_indexed | 2024-03-11T11:41:21Z |
| format | Article |
| id | doaj.art-41000ac557b74b4d9e3274df139dfe45 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-11T11:41:21Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-41000ac557b74b4d9e3274df139dfe452023-11-10T04:15:38ZengElsevierPhysics Letters B0370-26932023-11-01846138193Search for K+ decays into the π+e+e−e+e− final stateE. Cortina Gil0A. Kleimenova1E. Minucci2S. Padolski3P. Petrov4A. Shaikhiev5R. Volpe6T. Numao7Y. Petrov8B. Velghe9V.W.S. Wong10D. Bryman11J. Fu12Z. Hives13T. Husek14J. Jerhot15K. Kampf16M. Zamkovsky17B. De Martino18M. Perrin-Terrin19A.T. Akmete20R. Aliberti21G. Khoriauli22J. Kunze23D. Lomidze24L. Peruzzo25M. Vormstein26R. Wanke27P. Dalpiaz28M. Fiorini29A. Mazzolari30I. Neri31A. Norton32F. Petrucci33M. Soldani34H. Wahl35L. Bandiera36A. Cotta Ramusino37A. Gianoli38M. Romagnoni39A. Sytov40E. Iacopini41G. Latino42M. Lenti43P. Lo Chiatto44I. Panichi45A. Parenti46A. Bizzeti47F. Bucci48A. Antonelli49G. Georgiev50V. Kozhuharov51G. Lanfranchi52S. Martellotti53M. Moulson54T. Spadaro55G. Tinti56F. Ambrosino57T. Capussela58M. Corvino59M. D'Errico60D. Di Filippo61R. Fiorenza62R. Giordano63P. Massarotti64M. Mirra65M. Napolitano66I. Rosa67G. Saracino68G. Anzivino69F. Brizioli70E. Imbergamo71R. Lollini72R. Piandani73C. Santoni74M. Barbanera75P. Cenci76B. Checcucci77P. Lubrano78M. Lupi79M. Pepe80M. Piccini81F. Costantini82L. Di Lella83N. Doble84M. Giorgi85S. Giudici86G. Lamanna87E. Lari88E. Pedreschi89M. Sozzi90C. Cerri91R. Fantechi92L. Pontisso93F. Spinella94I. Mannelli95G. D'Agostini96M. Raggi97A. Biagioni98P. Cretaro99O. Frezza100E. Leonardi101A. Lonardo102M. Turisini103P. Valente104P. Vicini105R. Ammendola106V. Bonaiuto107A. Fucci108A. Salamon109F. Sargeni110R. Arcidiacono111B. Bloch-Devaux112M. Boretto113E. Menichetti114E. Migliore115D. Soldi116C. Biino117A. Filippi118F. Marchetto119A. Briano Olvera120J. Engelfried121N. Estrada-Tristan122M.A. Reyes Santos123P. Boboc124A.M. Bragadireanu125S.A. Ghinescu126O.E. Hutanu127L. Bician128T. Blazek129V. Cerny130Z. Kucerova131J. Bernhard132A. Ceccucci133M. Ceoletta134H. Danielsson135N. De Simone136F. Duval137B. Döbrich138L. Federici139E. Gamberini140L. Gatignon141R. Guida142F. Hahn143E.B. Holzer144B. Jenninger145M. Koval146P. Laycock147G. Lehmann Miotto148P. Lichard149A. Mapelli150R. Marchevski151K. Massri152M. Noy153V. Palladino154J. Pinzino155V. Ryjov156S. Schuchmann157S. Venditti158T. Bache159M.B. Brunetti160V. Duk161V. Fascianelli162J.R. Fry163F. Gonnella164E. Goudzovski165J. Henshaw166L. Iacobuzio167C. Kenworthy168C. Lazzeroni169N. Lurkin170F. Newson171C. Parkinson172A. Romano173J. Sanders174A. Sergi175A. Sturgess176J. Swallow177A. Tomczak178H. Heath179R. Page180S. Trilov181B. Angelucci182D. Britton183C. Graham184D. Protopopescu185J. Carmignani186J.B. Dainton187R.W.L. Jones188G. Ruggiero189L. Fulton190D. Hutchcroft191E. Maurice192B. Wrona193A. Conovaloff194P. Cooper195D. Coward196P. Rubin197A. Baeva198D. Baigarashev199D. Emelyanov200T. Enik201V. Falaleev202S. Fedotov203K. Gorshanov204E. Gushchin205V. Kekelidze206D. Kereibay207S. Kholodenko208A. Khotyantsev209A. Korotkova210Y. Kudenko211V. Kurochka212V. Kurshetsov213L. Litov214D. Madigozhin215M. Medvedeva216A. Mefodev217M. Misheva218N. Molokanova219S. Movchan220V. Obraztsov221A. Okhotnikov222A. Ostankov223I. Polenkevich224Yu. Potrebenikov225A. Sadovskiy226V. Semenov227S. Shkarovskiy228V. Sugonyaev229O. Yushchenko230A. Zinchenko231Université 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, 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 RepublicCharles University, Prague, Czech RepublicAix Marseille University, CNRS/IN2P3, CPPM, Marseille, FranceAix Marseille University, CNRS/IN2P3, CPPM, Marseille, FranceInstitut 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, 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, 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, ItalyINFN, 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, 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 “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 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, MexicoInstituto 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 for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaFaculty 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, SwitzerlandSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomCorresponding author.; School of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomFaculty of Science and Technology, University of Lancaster, Lancaster, United KingdomFaculty of Science and Technology, University of Lancaster, Lancaster, United KingdomFaculty of Science and Technology, University of Lancaster, Lancaster, United KingdomFaculty of Science and Technology, University of Lancaster, Lancaster, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNThe first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.http://www.sciencedirect.com/science/article/pii/S0370269323005270 |
| spellingShingle | E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa 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 P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini 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 A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta 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 J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak 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 A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko Search for K+ decays into the π+e+e−e+e− final state Physics Letters B |
| title | Search for K+ decays into the π+e+e−e+e− final state |
| title_full | Search for K+ decays into the π+e+e−e+e− final state |
| title_fullStr | Search for K+ decays into the π+e+e−e+e− final state |
| title_full_unstemmed | Search for K+ decays into the π+e+e−e+e− final state |
| title_short | Search for K+ decays into the π+e+e−e+e− final state |
| title_sort | search for k decays into the π e e e e final state |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323005270 |
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