Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay

Abstract The NA62 experiment reports the branching ratio measurement BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^...

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Main Authors: The NA62 collaboration, 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, 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, A. Baeva, D. Baigarashev, D. Emelyanov, 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, J. Henshaw, 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: SpringerOpen 2021-06-01
Series:Journal of High Energy Physics
Subjects:
Online Access:https://doi.org/10.1007/JHEP06(2021)093
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author The NA62 collaboration
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
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
A. Baeva
D. Baigarashev
D. Emelyanov
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
J. Henshaw
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_facet The NA62 collaboration
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
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
A. Baeva
D. Baigarashev
D. Emelyanov
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
J. Henshaw
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 The NA62 collaboration
collection DOAJ
description Abstract The NA62 experiment reports the branching ratio measurement BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} $$ at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10 −11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. This measurement is also used to set limits on BR(K + → π + X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.
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spelling doaj.art-cb1bb5ef1dde485e8c1b778cc32a6ecd2022-12-21T22:51:19ZengSpringerOpenJournal of High Energy Physics1029-84792021-06-012021612710.1007/JHEP06(2021)093Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decayThe NA62 collaborationE. 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. Lanfranchi40S. Martellotti41M. Moulson42T. Spadaro43F. Ambrosino44T. Capussela45M. Corvino46D. Di Filippo47P. Massarotti48M. Mirra49M. Napolitano50G. Saracino51G. Anzivino52F. Brizioli53E. Imbergamo54R. Lollini55R. Piandani56C. Santoni57M. Barbanera58P. Cenci59B. Checcucci60P. Lubrano61M. Lupi62M. Pepe63M. Piccini64F. Costantini65L. Di Lella66N. Doble67M. Giorgi68S. Giudici69G. Lamanna70E. Lari71E. Pedreschi72M. Sozzi73C. Cerri74R. Fantechi75L. Pontisso76F. Spinella77I. Mannelli78G. D’Agostini79M. Raggi80A. Biagioni81E. Leonardi82A. Lonardo83P. Valente84P. Vicini85R. Ammendola86V. Bonaiuto87A. Fucci88A. Salamon89F. Sargeni90R. Arcidiacono91B. Bloch-Devaux92M. Boretto93E. Menichetti94E. Migliore95D. Soldi96C. Biino97A. Filippi98F. Marchetto99J. Engelfried100N. Estrada-Tristan101A. M. Bragadireanu102S. A. Ghinescu103O. E. Hutanu104A. Baeva105D. Baigarashev106D. Emelyanov107T. Enik108V. Falaleev109V. Kekelidze110A. Korotkova111L. Litov112D. Madigozhin113M. Misheva114N. Molokanova115S. Movchan116I. Polenkevich117Yu. Potrebenikov118S. Shkarovskiy119A. Zinchenko120S. Fedotov121E. Gushchin122A. Khotyantsev123Y. Kudenko124V. Kurochka125M. Medvedeva126A. Mefodev127S. Kholodenko128V. Kurshetsov129V. Obraztsov130A. Ostankov131V. Semenov132V. Sugonyaev133O. Yushchenko134L. Bician135T. Blazek136V. Cerny137Z. Kucerova138J. Bernhard139A. Ceccucci140H. Danielsson141N. De Simone142F. Duval143B. Döbrich144L. Federici145E. Gamberini146L. Gatignon147R. Guida148F. Hahn149E. B. Holzer150B. Jenninger151M. Koval152P. Laycock153G. Lehmann Miotto154P. Lichard155A. Mapelli156R. Marchevski157K. Massri158M. Noy159V. Palladino160M. Perrin-Terrin161J. Pinzino162V. Ryjov163S. Schuchmann164S. Venditti165T. Bache166M. B. Brunetti167V. Duk168V. Fascianelli169J. R. Fry170F. Gonnella171E. Goudzovski172J. Henshaw173L. Iacobuzio174C. Lazzeroni175N. Lurkin176F. Newson177C. Parkinson178A. Romano179A. Sergi180A. Sturgess181J. Swallow182H. Heath183R. Page184S. Trilov185B. Angelucci186D. Britton187C. Graham188D. Protopopescu189J. Carmignani190J. B. Dainton191R. W. L. Jones192G. Ruggiero193L. Fulton194D. Hutchcroft195E. Maurice196B. Wrona197A. Conovaloff198P. Cooper199D. Coward200P. Rubin201Université Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainTRIUMFTRIUMFTRIUMFTRIUMFUniversity of British ColumbiaCharles UniversityUniversité Catholique de LouvainCharles UniversityCharles UniversityInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzINFN, Sezione di FerraraINFN, Sezione di FerraraDipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di FirenzeDipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di FirenzeDipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di FirenzeDipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di FirenzeINFN, Sezione di FirenzeINFN, Sezione di FirenzeLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiLaboratori Nazionali di FrascatiDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di NapoliDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaDipartimento di Fisica e Geologia dell’Università e INFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaINFN, Sezione di PerugiaDipartimento di Fisica dell’Università e INFN, Sezione di PisaInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzDipartimento di Fisica dell’Università e INFN, Sezione di PisaDipartimento di Fisica dell’Università e INFN, Sezione di PisaDipartimento di Fisica dell’Università e INFN, Sezione di PisaDipartimento di Fisica dell’Università e INFN, Sezione di PisaDipartimento di Fisica dell’Università e INFN, Sezione di PisaDipartimento di Fisica dell’Università e INFN, Sezione di PisaINFN, Sezione di PisaINFN, Sezione di PisaINFN, Sezione di PisaINFN, Sezione di PisaScuola Normale Superiore e INFN, Sezione di PisaDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma IDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma IINFN, Sezione di Roma IINFN, Sezione di Roma IINFN, Sezione di Roma IINFN, Sezione di Roma IINFN, Sezione di Roma IINFN, Sezione di Roma Tor VergataINFN, Sezione di Roma Tor VergataINFN, Sezione di Roma Tor VergataINFN, Sezione di Roma Tor VergataINFN, Sezione di Roma Tor VergataDipartimento di Fisica dell’Università e INFN, Sezione di TorinoDipartimento di Fisica dell’Università e INFN, Sezione di TorinoDipartimento di Fisica dell’Università e INFN, Sezione di TorinoDipartimento di Fisica dell’Università e INFN, Sezione di TorinoDipartimento di Fisica dell’Università e INFN, Sezione di TorinoDipartimento di Fisica dell’Università e INFN, Sezione di TorinoINFN, Sezione di TorinoINFN, Sezione di TorinoINFN, Sezione di TorinoInstituto de Física, Universidad Autónoma de San Luis PotosíInstituto de Física, Universidad Autónoma de San Luis PotosíHoria Hulubei National Institute of Physics for R&D in Physics and Nuclear EngineeringHoria Hulubei National Institute of Physics for R&D in Physics and Nuclear EngineeringHoria Hulubei National Institute of Physics for R&D in Physics and Nuclear EngineeringJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchJoint Institute for Nuclear ResearchInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for Nuclear Research of the Russian Academy of SciencesInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationInstitute for High Energy Physics - State Research Center of Russian FederationFaculty of Mathematics, Physics and Informatics, Comenius UniversityFaculty of Mathematics, Physics and Informatics, Comenius UniversityFaculty of Mathematics, Physics and Informatics, Comenius UniversityFaculty of Mathematics, Physics and Informatics, Comenius UniversityCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCharles UniversityCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchCERN, European Organization for Nuclear ResearchUniversité Catholique de LouvainINFN, Sezione di PisaCERN, European Organization for Nuclear ResearchInstitut für Physik and PRISMA Cluster of Excellence, Universität MainzCERN, European Organization for Nuclear ResearchUniversity of BirminghamUniversity of BirminghamINFN, Sezione di PerugiaUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversité Catholique de LouvainUniversity of BirminghamUniversité Catholique de LouvainUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BirminghamUniversity of BristolUniversity of BristolUniversity of BristolUniversity of GlasgowUniversity of GlasgowUniversity of GlasgowUniversity of GlasgowUniversity of LancasterUniversity of LancasterUniversity of LancasterDipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di FirenzeUniversity of LiverpoolUniversity of LiverpoolUniversity of LiverpoolUniversity of LiverpoolGeorge Mason UniversityGeorge Mason UniversityGeorge Mason UniversityGeorge Mason UniversityAbstract The NA62 experiment reports the branching ratio measurement BR K + → π + ν ν ¯ = 10.6 − 3.4 + 4.0 stat ± 0.9 syst × 10 − 11 $$ \mathrm{BR}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({10.6}_{-3.4}^{+4.0}\left|{}_{\mathrm{stat}}\right.\pm {0.9}_{\mathrm{syst}}\right)\times {10}^{-11} $$ at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10 −11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. This measurement is also used to set limits on BR(K + → π + X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.https://doi.org/10.1007/JHEP06(2021)093FCNC InteractionFlavour Changing Neutral CurrentsRare decayFixed target experimentsFlavor physics
spellingShingle The NA62 collaboration
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
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
A. Baeva
D. Baigarashev
D. Emelyanov
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
J. Henshaw
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
Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
Journal of High Energy Physics
FCNC Interaction
Flavour Changing Neutral Currents
Rare decay
Fixed target experiments
Flavor physics
title Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
title_full Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
title_fullStr Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
title_full_unstemmed Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
title_short Measurement of the very rare K + → π + ν ν ¯ $$ {\pi}^{+}\nu \overline{\nu} $$ decay
title_sort measurement of the very rare k π ν ν ¯ pi nu overline nu decay
topic FCNC Interaction
Flavour Changing Neutral Currents
Rare decay
Fixed target experiments
Flavor physics
url https://doi.org/10.1007/JHEP06(2021)093
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