Measurement of the Very Rare K+→π+νν¯ Decay

Aliberti, R; Ambrosino, F; Ammendola, R; Angelucci, B; Antonelli, A; Anzivino, G; Arcidiacono, R; Bache, T; Baeva, A; Baigarashev, D; Barbanera, M; Bernhard, J; Biagioni, A; Bician, L; Biino, C; Bizzeti, A; Blazek, T; Blochdevaux, B; Bonaiuto, V; Boretto, M; Bragadireanu, M; 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; Cortina Gil, E; Corvino, M; Costantini, F; Cotta Ramusino, A; Coward, D; D’Gostini, G; Dainton, J; Dalpiaz, P; Danielsson, H; 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; Fiorini, M; Fry, J; Fu, J; Fucci, A; Fulton, L; Gamberini, E; Gatignon, L; Georgiev, G; Ghinescu, S; Gianoli, A; Giorgi, M; Giudici, S; Gonnella, F; Goudzovski, E; Graham, C; Guida, R; Gushchin, E; Hahn, F; Heath, H; Henshaw, J; Holzer, Eb; Husek, T; Hutanu, O; Hutchcroft, D; Iacobuzio, L; Iacopini, E; Imbergamo, E; Jenninger, B; Jerhot, J; Jones, Rw; Kampf, K; Kekelidze, V; 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; Lehmann Miotto, G; Leonardi, E; Lichard, P; Litov, L; 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; Napolitano, M; Neri, I; Newson, F; Norton, A; Noy, M; Numao, T; Obraztsov, V; Ostankov, A; Padolski, S; Page, R; Palladino, V; 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; Romano, A; Rubin, P; Ruggiero, G; Ryjov, V; Salamon, A; Santoni, C; Saracino, G; Sargeni, F; Schuchmann, S; Semenov, V; Sergi, A; Shaikhiev, A; Shkarovskiy, S; Soldi, D; Sugonyaev, V; Sozzi, M; Spadaro, T; Spinella, F; Sturgess, A; Swallow, J; Trilov, S; Valente, P; Velghe, B; Venditti, S; Vicini, P; Volpe, R; Vormstein, M; Wahl, H; Wanke, R; Wrona, B; Yushchenko, O; Zamkovsky, M; Zinchenko, A

doi:10.3103/S0027134922021090

The decay K+ -> pi(+)nu(nu) over bar, 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 at CERN SPS is designed to study the K+ -> pi(+)nu(nu) over bar decay and to measure its branching ratio using a decay-in-flight technique. NA62 took data in 2016, 2017, and 2018, reaching the sensitivity of the Standard Model for the K+ -> pi(+)nu(nu) over bar decay by the analysis of the 2016 and 2017 data, and providing the most precise measurement of the branching ratio to date by the analysis of the 2018 data. The final result of the BR(K+ -> pi(+)nu(nu) over bar) measurement from the analysis of the full 2016-2017-2018 data set is presented, and future plans and prospects reviewed.

Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., Anzivino, G., et al. (2022). Measurement of the Very Rare K+→π+νν¯ Decay. MOSCOW UNIVERSITY PHYSICS BULLETIN, 77(2), 276-279 [10.3103/S0027134922021090].