First observation of the K+ → π+νν̄ decay with the NA62 experiment

Akmete, A; Aliberti, R; Ambrosino, F; Ammendola, R; Angelucci, B; Antonelli, A; Anzivino, G; Arcidiacono, R; Ashraf, Mu; Bache, T; Baeva, A; Baigarashev, D; Bandiera, L; Barbanera, M; Bautin, V; Bernhard, J; Biagioni, A; Bician, L; Biino, C; Bizzeti, A; Blazek, T; Bloch-Devaux, B; Boboc, P; Bonaiuto, V; Boretto, M; Bragadireanu, M; Briano Olvera, A; Britton, D; Brizioli, F; Brunetti, Mb; Bryman, D; Bucci, F; Canale, N; Capussela, T; Carmignani, J; Ceccucci, A; Cenci, P; Ceoletta, M; Cerny, V; Cerri, C; Chang, X; Checcucci, B; Conovaloﬀ, A; Cooper, P; Cortina Gil, E; Corvino, M; Costantini, F; Cotta Ramusino, A; Coward, D; Cretaro, P; D’Agostini, G; Dainton, Jb; Dalpiaz, P; Danielsson, H; De Martino, B; 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; Francesconi, M; Frezza, O; Fry, J; Fu, J; Fucci, A; Fulton, L; Gamberini, E; Gatignon, L; Georgiev, G; Ghinescu, S; Gianoli, A; Giordano, R; 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; Kenworthy, C; Kereibay, D; Kholodenko, S; Khoriauli, G; Khotyantsev, A; Kleimenova, A; Kolesar, M; 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; Lehmann Miotto, G; Lenti, M; Leonardi, E; Lezki, S; 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; Medvedeva, M; Mefodev, A; Menichetti, E; Migliore, E; Minucci, E; Mirra, M; Misheva, M; Molokanova, N; Moulson, M; Movchan, S; Mukhamejanov, Y; Mukhamejanova, A; Napolitano, M; Negrello, R; 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; Petit, L; Petrov, P; Petrov, Y; Petrucci, F; Piandani, R; Piccini, M; Pinzino, J; Polenkevich, I; Polivka, C; Pontisso, L; Potrebenikov, Y; Protopopescu, D; Raggi, M; Reyes Santos, M; Rodriguez Rivera, K; Romagnoni, M; Romano, A; Rosa, I; Rubin, P; Ruggiero, G; Ryjov, V; Sadovsky, A; Saduyev, N; Sakhiyev, S; Salamatin, K; Salamon, A; Sam, C; Sanders, J; Santoni, C; Saracino, G; Sargeni, F; Schubert, J; 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; Velas, T; Velghe, B; Venditti, S; Vicini, P; Volpe, R; Vormstein, M; Wahl, H; Wanke, R; Wong, V; Wrona, B; Yushchenko, O; Zamkovsky, M; A. Zinchenko.,

doi:10.1393/ncc/i2026-26059-6

The NA62 experiment at CERN is designed to study the K+ -> pi+nu nu decay. After collecting data in 2016, 2017, and 2018, the experiment resumed data taking in 2021 and has received approval for operations until the start of Long Shutdown 3 in 2026. The first observation of the K+->pi+nu nudecay achieved combining the data collected in 2016-2022 is reported.

Akmete, A., Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., et al. (2026). First observation of the K+ → π+νν̄ decay with the NA62 experiment. IL NUOVO CIMENTO C, 49(1-2) [10.1393/ncc/i2026-26059-6].