Measurement of the very rare K+ → π+ν ¯ν decay at the NA62 experiment
- Brizioli, F
- Akmete, A
- Aliberti, R
- Ambrosino, F
- Ammendola, R
- Angelucci, B
- Antonelli, A
- Anzivino, G
- Arcidiacono, R
- Bache, T
- Baeva, A
- Baigarashev, D
- Bandiera, L
- Barbanera, M
- Bernhard, J
- Biagioni, A
- Bician, L
- Biino, C
- Bizzeti, A
- Blazek, T
- Bloch-Devaux, B
- Boboc, P
- Bonaiuto, V
- Boretto, M
- Bragadireanu, M
- Olvera, AB
- Britton, D
- Brizioli, F
- Brunetti, MB
- Bryman, D
- Bucci, F
- Capussela, T
- Carmignani, J
- Ceccucci, A
- Cenci, P
- Cerny, V
- Cerri, C
- Checcucci, B
- Conovaloff, A
- Cooper, P
- Gil, EC
- Corvino, M
- Costantini, F
- Ramusino, AC
- Coward, D
- Cretaro, P
- D'Agostini, G
- Dainton, J
- Dalpiaz, P
- Danielsson, H
- D'Errico, M
- De Simone, N
- Di Filippo, D
- Di Lella, L
- Doble, N
- Dobrich, B
- Duval, F
- Duk, V
- Emelyanov, D
- Engelfried, J
- Enik, T
- Estrada-Tristan, N
- Falaleev, V
- Fantechi, R
- Fascianelli, V
- Federici, L
- Fedotov, S
- Filippi, A
- Fiorenza, R
- Fiorini, M
- Frezza, O
- Fry, J
- Fu, J
- Fucci, A
- Fulton, L
- Gamberini, E
- Gatignon, L
- Georgiev, G
- Ghinescu, S
- Gianoli, A
- Giorgi, M
- Giudici, S
- Gonnella, F
- Gorshanov, K
- Goudzovski, E
- Graham, C
- Guida, R
- Gushchin, E
- Hahn, F
- Heath, H
- Henshaw, J
- Hives, Z
- Holzer, EB
- Husek, T
- Hutanu, O
- Hutchcroft, D
- Iacobuzio, L
- Iacopini, E
- Imbergamo, E
- Jenninger, B
- Jerhot, J
- Jones, RW
- Kampf, K
- Kekelidze, V
- Kereibay, D
- Kholodenko, S
- Khoriauli, G
- Khotyantsev, A
- Kleimenova, A
- Korotkova, A
- Koval, M
- Kozhuharov, V
- Kucerova, Z
- Kudenko, Y
- Kunze, J
- Kurochka, V
- Kurshetsov, V
- Lanfranchi, G
- Lamanna, G
- Lari, E
- Latino, G
- Laycock, P
- Lazzeroni, C
- Lenti, M
- Miotto, GL
- Leonardi, E
- Lichard, P
- Litov, L
- Lo Chiatto, P
- Lollini, R
- Lomidze, D
- Lonardo, A
- Lubrano, P
- Lupi, M
- Lurkin, N
- Madigozhin, D
- Mannelli, I
- Mapelli, A
- Marchetto, F
- Marchevski, R
- Martellotti, S
- Massarotti, P
- Massri, K
- Maurice, E
- Mazzolari, A
- Medvedeva, M
- Mefodev, A
- Menichetti, E
- Migliore, E
- Minucci, E
- Mirra, M
- Misheva, M
- Molokanova, N
- Moulson, M
- Movchan, S
- Napolitano, M
- Neri, I
- Newson, F
- Norton, A
- Noy, M
- Numao, T
- Obraztsov, V
- Okhotnikov, A
- Ostankov, A
- Padolski, S
- Page, R
- Palladino, V
- Panichi, I
- Parenti, A
- Parkinson, C
- Pedreschi, E
- Pepe, M
- Perrin-Terrin, M
- Peruzzo, L
- Petrov, P
- Petrov, Y
- Petrucci, F
- Piandani, R
- Piccini, M
- Pinzino, J
- Polenkevich, I
- Pontisso, L
- Potrebenikov, Y
- Protopopescu, D
- Raggi, M
- Santos, MR
- Romagnoni, M
- Romano, A
- Rubin, P
- Ruggiero, G
- Ryjov, V
- Sadovsky, A
- Salamon, A
- Santoni, C
- Saracino, G
- Sargeni, F
- Schuchmann, S
- Semenov, V
- Sergi, A
- Shaikhiev, A
- Shkarovskiy, S
- Soldani, M
- Soldi, D
- Sozzi, M
- Spadaro, T
- Spinella, F
- Sturgess, A
- Sugonyaev, V
- Swallow, J
- Sytov, A
- Tinti, G
- Tomczak, A
- Trilov, S
- Turisini, M
- Valente, P
- Velghe, B
- Venditti, S
- Vicini, P
- Volpe, R
- Vormstein, M
- Wahl, H
- Wanke, R
- Wong, V
- Wrona, B
- Yushchenko, O
- Zamkovsky, M
- Zinchenko, A
DOIAbstract
The K+ -> pi(+) nu(nu) over bar decay, with a very precisely predicted branching ratio of less than 10(-10), is among the best processes to reveal indirect effects of new physics. The NA62 experiment reports the branching ratio measurement BR(K+ -> pi(+) nu(nu) over bar) = (1.06(-0.34)(+0.40)vertical bar(stat) +/- 0.09 vertical bar syst) . 10(-10) 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+ -> pi(+)nu(nu) over bar decay, observed with a significance of 3.4 sigma. This measurement is also used to set limits on BR(K+ -> pi(+) X), where X is a new feebly interac...
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