First search for K+→π+νν¯ using the decay-in-flight technique
The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011 K+ decays collected in 2016. The single event sensitivity is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while...
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| Format: | Article |
| Language: | English |
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Elsevier
2019-04-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269319301121 |
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E. Cortina Gil E. Minucci S. Padolski P. Petrov B. Velghe G. Georgiev V. Kozhuharov L. Litov T. Numao D. Bryman J. Fu T. Husek K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze R. Marchevski L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini E. Gamberini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Bizzeti F. Bucci R. Volpe A. Antonelli G. Lamanna G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson M. Raggi 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 C. Santoni M. Barbanera P. Cenci B. Checcucci V. Duk P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici E. Pedreschi M. Sozzi C. Cerri R. Fantechi R. Piandani J. Pinzino L. Pontisso F. Spinella I. Mannelli G. D'Agostini A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto L. Federici 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 D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev A. Kleimenova Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev A. Shaikhiev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny M. Koval Z. Kucerova A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Gatignon R. Guida F. Hahn B. Jenninger P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli K. Massri M. Noy V. Palladino M. Perrin-Terrin V. Ryjov S. Venditti M.B. Brunetti V. Fascianelli 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.B. Dainton J.R. Fry L. Fulton D. Hutchcroft E. Maurice G. Ruggiero B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin |
| spellingShingle |
E. Cortina Gil E. Minucci S. Padolski P. Petrov B. Velghe G. Georgiev V. Kozhuharov L. Litov T. Numao D. Bryman J. Fu T. Husek K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze R. Marchevski L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini E. Gamberini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Bizzeti F. Bucci R. Volpe A. Antonelli G. Lamanna G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson M. Raggi 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 C. Santoni M. Barbanera P. Cenci B. Checcucci V. Duk P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici E. Pedreschi M. Sozzi C. Cerri R. Fantechi R. Piandani J. Pinzino L. Pontisso F. Spinella I. Mannelli G. D'Agostini A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto L. Federici 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 D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev A. Kleimenova Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev A. Shaikhiev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny M. Koval Z. Kucerova A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Gatignon R. Guida F. Hahn B. Jenninger P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli K. Massri M. Noy V. Palladino M. Perrin-Terrin V. Ryjov S. Venditti M.B. Brunetti V. Fascianelli 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.B. Dainton J.R. Fry L. Fulton D. Hutchcroft E. Maurice G. Ruggiero B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin First search for K+→π+νν¯ using the decay-in-flight technique Physics Letters B |
| author_facet |
E. Cortina Gil E. Minucci S. Padolski P. Petrov B. Velghe G. Georgiev V. Kozhuharov L. Litov T. Numao D. Bryman J. Fu T. Husek K. Kampf M. Zamkovsky R. Aliberti G. Khoriauli J. Kunze D. Lomidze R. Marchevski L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini E. Gamberini I. Neri A. Norton F. Petrucci H. Wahl A. Cotta Ramusino A. Gianoli E. Iacopini G. Latino M. Lenti A. Bizzeti F. Bucci R. Volpe A. Antonelli G. Lamanna G. Lanfranchi G. Mannocchi S. Martellotti M. Moulson M. Raggi 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 C. Santoni M. Barbanera P. Cenci B. Checcucci V. Duk P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici E. Pedreschi M. Sozzi C. Cerri R. Fantechi R. Piandani J. Pinzino L. Pontisso F. Spinella I. Mannelli G. D'Agostini A. Biagioni E. Leonardi A. Lonardo P. Valente P. Vicini R. Ammendola V. Bonaiuto L. Federici 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 D. Madigozhin M. Misheva N. Molokanova S. Movchan I. Polenkevich Yu. Potrebenikov S. Shkarovskiy A. Zinchenko S. Fedotov E. Gushchin A. Khotyantsev A. Kleimenova Y. Kudenko V. Kurochka M. Medvedeva A. Mefodev A. Shaikhiev S. Kholodenko V. Kurshetsov V. Obraztsov A. Ostankov V. Semenov V. Sugonyaev O. Yushchenko L. Bician T. Blazek V. Cerny M. Koval Z. Kucerova A. Ceccucci H. Danielsson N. De Simone F. Duval B. Döbrich L. Gatignon R. Guida F. Hahn B. Jenninger P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli K. Massri M. Noy V. Palladino M. Perrin-Terrin V. Ryjov S. Venditti M.B. Brunetti V. Fascianelli 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.B. Dainton J.R. Fry L. Fulton D. Hutchcroft E. Maurice G. Ruggiero B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin |
| author_sort |
E. Cortina Gil |
| title |
First search for K+→π+νν¯ using the decay-in-flight technique |
| title_short |
First search for K+→π+νν¯ using the decay-in-flight technique |
| title_full |
First search for K+→π+νν¯ using the decay-in-flight technique |
| title_fullStr |
First search for K+→π+νν¯ using the decay-in-flight technique |
| title_full_unstemmed |
First search for K+→π+νν¯ using the decay-in-flight technique |
| title_sort |
first search for k+→π+νν¯ using the decay-in-flight technique |
| publisher |
Elsevier |
| series |
Physics Letters B |
| issn |
0370-2693 |
| publishDate |
2019-04-01 |
| description |
The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011 K+ decays collected in 2016. The single event sensitivity is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10−10 on the K+→π+νν¯ branching ratio at 95% CL. |
| url |
http://www.sciencedirect.com/science/article/pii/S0370269319301121 |
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1725306927221571584 |
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doaj-a7c319f568e74d9d98b70e1de6528a462020-11-25T00:35:57ZengElsevierPhysics Letters B0370-26932019-04-01791156166First search for K+→π+νν¯ using the decay-in-flight techniqueE. Cortina Gil0E. Minucci1S. Padolski2P. Petrov3B. Velghe4G. Georgiev5V. Kozhuharov6L. Litov7T. Numao8D. Bryman9J. Fu10T. Husek11K. Kampf12M. Zamkovsky13R. Aliberti14G. Khoriauli15J. Kunze16D. Lomidze17R. Marchevski18L. Peruzzo19M. Vormstein20R. Wanke21P. Dalpiaz22M. Fiorini23E. Gamberini24I. Neri25A. Norton26F. Petrucci27H. Wahl28A. Cotta Ramusino29A. Gianoli30E. Iacopini31G. Latino32M. Lenti33A. Bizzeti34F. Bucci35R. Volpe36A. Antonelli37G. Lamanna38G. Lanfranchi39G. Mannocchi40S. Martellotti41M. Moulson42M. Raggi43T. Spadaro44F. Ambrosino45T. Capussela46M. Corvino47D. Di Filippo48P. Massarotti49M. Mirra50M. Napolitano51G. Saracino52G. Anzivino53F. Brizioli54E. Imbergamo55R. Lollini56C. Santoni57M. Barbanera58P. Cenci59B. Checcucci60V. Duk61P. Lubrano62M. Lupi63M. Pepe64M. Piccini65F. Costantini66L. Di Lella67N. Doble68M. Giorgi69S. Giudici70E. Pedreschi71M. Sozzi72C. Cerri73R. Fantechi74R. Piandani75J. Pinzino76L. Pontisso77F. Spinella78I. Mannelli79G. D'Agostini80A. Biagioni81E. Leonardi82A. Lonardo83P. Valente84P. Vicini85R. Ammendola86V. Bonaiuto87L. Federici88A. 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. Korotkova109D. Madigozhin110M. Misheva111N. Molokanova112S. Movchan113I. Polenkevich114Yu. Potrebenikov115S. Shkarovskiy116A. Zinchenko117S. Fedotov118E. Gushchin119A. Khotyantsev120A. Kleimenova121Y. Kudenko122V. Kurochka123M. Medvedeva124A. Mefodev125A. Shaikhiev126S. Kholodenko127V. Kurshetsov128V. Obraztsov129A. Ostankov130V. Semenov131V. Sugonyaev132O. Yushchenko133L. Bician134T. Blazek135V. Cerny136M. Koval137Z. Kucerova138A. Ceccucci139H. Danielsson140N. De Simone141F. Duval142B. Döbrich143L. Gatignon144R. Guida145F. Hahn146B. Jenninger147P. Laycock148G. Lehmann Miotto149P. Lichard150A. Mapelli151K. Massri152M. Noy153V. Palladino154M. Perrin-Terrin155V. Ryjov156S. Venditti157M.B. Brunetti158V. Fascianelli159F. Gonnella160E. Goudzovski161L. Iacobuzio162C. Lazzeroni163N. Lurkin164F. Newson165C. Parkinson166A. Romano167A. Sergi168A. Sturgess169J. Swallow170H. Heath171R. Page172S. Trilov173B. Angelucci174D. Britton175C. Graham176D. Protopopescu177J.B. Dainton178J.R. Fry179L. Fulton180D. Hutchcroft181E. Maurice182G. Ruggiero183B. Wrona184A. Conovaloff185P. Cooper186D. Coward187P. Rubin188Université 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, BelgiumFaculty of Physics, University of Sofia, Sofia, BulgariaFaculty of Physics, University of Sofia, Sofia, BulgariaFaculty of Physics, University of Sofia, Sofia, BulgariaTRIUMF, 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 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, GermanyCorresponding author.; Institut 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, 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, ItalyINFN, 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, 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, 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, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, 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, 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, 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, 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 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, 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, 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 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 Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomUniversity of Liverpool, Liverpool, United KingdomCorresponding author.; University 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 the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011 K+ decays collected in 2016. The single event sensitivity is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10−10 on the K+→π+νν¯ branching ratio at 95% CL.http://www.sciencedirect.com/science/article/pii/S0370269319301121 |