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

Abstract The NA62 experiment reports an investigation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ mode from a sample of K + decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10 −10, corresponding to 2.2 event...

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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, B. Velghe, D. Bryman, J. Fu, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, R. Marchevski, 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, 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: SpringerOpen 2020-11-01
Series:Journal of High Energy Physics
Subjects:
Online Access:http://link.springer.com/article/10.1007/JHEP11(2020)042
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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
B. Velghe
D. Bryman
J. Fu
T. Husek
J. Jerhot
K. Kampf
M. Zamkovsky
R. Aliberti
G. Khoriauli
J. Kunze
D. Lomidze
R. Marchevski
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
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_facet The NA62 collaboration
E. Cortina Gil
A. Kleimenova
E. Minucci
S. Padolski
P. Petrov
A. Shaikhiev
R. Volpe
T. Numao
B. Velghe
D. Bryman
J. Fu
T. Husek
J. Jerhot
K. Kampf
M. Zamkovsky
R. Aliberti
G. Khoriauli
J. Kunze
D. Lomidze
R. Marchevski
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
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 The NA62 collaboration
collection DOAJ
description Abstract The NA62 experiment reports an investigation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ mode from a sample of K + decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10 −10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10 −10 for the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of ( 0.48 − 0.48 + 0.72 $$ {0.48}_{-0.48}^{+0.72} $$ ) × 10 −10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.
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spelling doaj.art-d184b02bde7547edaa6a670298325af42022-12-21T23:36:23ZengSpringerOpenJournal of High Energy Physics1029-84792020-11-0120201115710.1007/JHEP11(2020)042An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decayThe NA62 collaborationE. Cortina Gil0A. Kleimenova1E. Minucci2S. Padolski3P. Petrov4A. Shaikhiev5R. Volpe6T. Numao7B. Velghe8D. Bryman9J. Fu10T. Husek11J. Jerhot12K. Kampf13M. Zamkovsky14R. Aliberti15G. Khoriauli16J. Kunze17D. Lomidze18R. Marchevski19L. 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. Mapelli156K. Massri157M. Noy158V. Palladino159M. Perrin-Terrin160J. Pinzino161V. Ryjov162S. Schuchmann163S. Venditti164T. Bache165M. B. Brunetti166V. Duk167V. Fascianelli168J. R. Fry169F. Gonnella170E. Goudzovski171L. Iacobuzio172C. Lazzeroni173N. Lurkin174F. Newson175C. Parkinson176A. Romano177A. Sergi178A. Sturgess179J. Swallow180H. Heath181R. Page182S. Trilov183B. Angelucci184D. Britton185C. Graham186D. Protopopescu187J. Carmignani188J. B. Dainton189R. W. L. Jones190G. Ruggiero191L. Fulton192D. Hutchcroft193E. Maurice194B. Wrona195A. Conovaloff196P. Cooper197D. Coward198P. Rubin199Université Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainUniversité Catholique de LouvainTRIUMFTRIUMFTRIUMFUniversity 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 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 FerraraDipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di FerraraINFN, 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 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 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 ResearchCERN, 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 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 LancasterUniversity of LancasterUniversity of LiverpoolUniversity of LiverpoolUniversity of LiverpoolUniversity of LiverpoolGeorge Mason UniversityGeorge Mason UniversityGeorge Mason UniversityGeorge Mason UniversityAbstract The NA62 experiment reports an investigation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ mode from a sample of K + decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10 −10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10 −11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10 −10 for the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of ( 0.48 − 0.48 + 0.72 $$ {0.48}_{-0.48}^{+0.72} $$ ) × 10 −10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.http://link.springer.com/article/10.1007/JHEP11(2020)042Fixed target experimentsFlavor physicsFlavour Changing Neutral CurrentsRare decay
spellingShingle The NA62 collaboration
E. Cortina Gil
A. Kleimenova
E. Minucci
S. Padolski
P. Petrov
A. Shaikhiev
R. Volpe
T. Numao
B. Velghe
D. Bryman
J. Fu
T. Husek
J. Jerhot
K. Kampf
M. Zamkovsky
R. Aliberti
G. Khoriauli
J. Kunze
D. Lomidze
R. Marchevski
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
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
An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
Journal of High Energy Physics
Fixed target experiments
Flavor physics
Flavour Changing Neutral Currents
Rare decay
title An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
title_full An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
title_fullStr An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
title_full_unstemmed An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
title_short An investigation of the very rare K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay
title_sort investigation of the very rare k π ν ν ¯ k to pi nu overline nu decay
topic Fixed target experiments
Flavor physics
Flavour Changing Neutral Currents
Rare decay
url http://link.springer.com/article/10.1007/JHEP11(2020)042
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AT mlenti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aparenti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT abizzeti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fbucci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aantonelli investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ggeorgiev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vkozhuharov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT glanfranchi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT smartellotti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mmoulson investigationoftheveryrarekpnnktopinuoverlinenudecay
AT tspadaro investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fambrosino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT tcapussela investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mcorvino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ddifilippo investigationoftheveryrarekpnnktopinuoverlinenudecay
AT pmassarotti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mmirra investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mnapolitano investigationoftheveryrarekpnnktopinuoverlinenudecay
AT gsaracino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ganzivino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fbrizioli investigationoftheveryrarekpnnktopinuoverlinenudecay
AT eimbergamo investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rlollini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rpiandani investigationoftheveryrarekpnnktopinuoverlinenudecay
AT csantoni investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mbarbanera investigationoftheveryrarekpnnktopinuoverlinenudecay
AT pcenci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bcheccucci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT plubrano investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mlupi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mpepe investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mpiccini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fcostantini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ldilella investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ndoble investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mgiorgi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT sgiudici investigationoftheveryrarekpnnktopinuoverlinenudecay
AT glamanna investigationoftheveryrarekpnnktopinuoverlinenudecay
AT elari investigationoftheveryrarekpnnktopinuoverlinenudecay
AT epedreschi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT msozzi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ccerri investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rfantechi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT lpontisso investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fspinella investigationoftheveryrarekpnnktopinuoverlinenudecay
AT imannelli investigationoftheveryrarekpnnktopinuoverlinenudecay
AT gdagostini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mraggi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT abiagioni investigationoftheveryrarekpnnktopinuoverlinenudecay
AT eleonardi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT alonardo investigationoftheveryrarekpnnktopinuoverlinenudecay
AT pvalente investigationoftheveryrarekpnnktopinuoverlinenudecay
AT pvicini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rammendola investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vbonaiuto investigationoftheveryrarekpnnktopinuoverlinenudecay
AT afucci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT asalamon investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fsargeni investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rarcidiacono investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bblochdevaux investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mboretto investigationoftheveryrarekpnnktopinuoverlinenudecay
AT emenichetti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT emigliore investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dsoldi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT cbiino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT afilippi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fmarchetto investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jengelfried investigationoftheveryrarekpnnktopinuoverlinenudecay
AT nestradatristan investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ambragadireanu investigationoftheveryrarekpnnktopinuoverlinenudecay
AT saghinescu investigationoftheveryrarekpnnktopinuoverlinenudecay
AT oehutanu investigationoftheveryrarekpnnktopinuoverlinenudecay
AT abaeva investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dbaigarashev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT demelyanov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT tenik investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vfalaleev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vkekelidze investigationoftheveryrarekpnnktopinuoverlinenudecay
AT akorotkova investigationoftheveryrarekpnnktopinuoverlinenudecay
AT llitov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dmadigozhin investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mmisheva investigationoftheveryrarekpnnktopinuoverlinenudecay
AT nmolokanova investigationoftheveryrarekpnnktopinuoverlinenudecay
AT smovchan investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ipolenkevich investigationoftheveryrarekpnnktopinuoverlinenudecay
AT yupotrebenikov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT sshkarovskiy investigationoftheveryrarekpnnktopinuoverlinenudecay
AT azinchenko investigationoftheveryrarekpnnktopinuoverlinenudecay
AT sfedotov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT egushchin investigationoftheveryrarekpnnktopinuoverlinenudecay
AT akhotyantsev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ykudenko investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vkurochka investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mmedvedeva investigationoftheveryrarekpnnktopinuoverlinenudecay
AT amefodev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT skholodenko investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vkurshetsov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vobraztsov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aostankov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vsemenov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vsugonyaev investigationoftheveryrarekpnnktopinuoverlinenudecay
AT oyushchenko investigationoftheveryrarekpnnktopinuoverlinenudecay
AT lbician investigationoftheveryrarekpnnktopinuoverlinenudecay
AT tblazek investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vcerny investigationoftheveryrarekpnnktopinuoverlinenudecay
AT zkucerova investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jbernhard investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aceccucci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT hdanielsson investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ndesimone investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fduval investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bdobrich investigationoftheveryrarekpnnktopinuoverlinenudecay
AT lfederici investigationoftheveryrarekpnnktopinuoverlinenudecay
AT egamberini investigationoftheveryrarekpnnktopinuoverlinenudecay
AT lgatignon investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rguida investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fhahn investigationoftheveryrarekpnnktopinuoverlinenudecay
AT ebholzer investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bjenninger investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mkoval investigationoftheveryrarekpnnktopinuoverlinenudecay
AT playcock investigationoftheveryrarekpnnktopinuoverlinenudecay
AT glehmannmiotto investigationoftheveryrarekpnnktopinuoverlinenudecay
AT plichard investigationoftheveryrarekpnnktopinuoverlinenudecay
AT amapelli investigationoftheveryrarekpnnktopinuoverlinenudecay
AT kmassri investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mnoy investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vpalladino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mperrinterrin investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jpinzino investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vryjov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT sschuchmann investigationoftheveryrarekpnnktopinuoverlinenudecay
AT svenditti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT tbache investigationoftheveryrarekpnnktopinuoverlinenudecay
AT mbbrunetti investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vduk investigationoftheveryrarekpnnktopinuoverlinenudecay
AT vfascianelli investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jrfry investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fgonnella investigationoftheveryrarekpnnktopinuoverlinenudecay
AT egoudzovski investigationoftheveryrarekpnnktopinuoverlinenudecay
AT liacobuzio investigationoftheveryrarekpnnktopinuoverlinenudecay
AT clazzeroni investigationoftheveryrarekpnnktopinuoverlinenudecay
AT nlurkin investigationoftheveryrarekpnnktopinuoverlinenudecay
AT fnewson investigationoftheveryrarekpnnktopinuoverlinenudecay
AT cparkinson investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aromano investigationoftheveryrarekpnnktopinuoverlinenudecay
AT asergi investigationoftheveryrarekpnnktopinuoverlinenudecay
AT asturgess investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jswallow investigationoftheveryrarekpnnktopinuoverlinenudecay
AT hheath investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rpage investigationoftheveryrarekpnnktopinuoverlinenudecay
AT strilov investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bangelucci investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dbritton investigationoftheveryrarekpnnktopinuoverlinenudecay
AT cgraham investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dprotopopescu investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jcarmignani investigationoftheveryrarekpnnktopinuoverlinenudecay
AT jbdainton investigationoftheveryrarekpnnktopinuoverlinenudecay
AT rwljones investigationoftheveryrarekpnnktopinuoverlinenudecay
AT gruggiero investigationoftheveryrarekpnnktopinuoverlinenudecay
AT lfulton investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dhutchcroft investigationoftheveryrarekpnnktopinuoverlinenudecay
AT emaurice investigationoftheveryrarekpnnktopinuoverlinenudecay
AT bwrona investigationoftheveryrarekpnnktopinuoverlinenudecay
AT aconovaloff investigationoftheveryrarekpnnktopinuoverlinenudecay
AT pcooper investigationoftheveryrarekpnnktopinuoverlinenudecay
AT dcoward investigationoftheveryrarekpnnktopinuoverlinenudecay
AT prubin investigationoftheveryrarekpnnktopinuoverlinenudecay