Measurement of the very rare $K^+ \rightarrow \pi^+ \nu \overline{\nu}$ decay at the NA62 experiment at CERN

The NA62 experiment reports the branching ratio measurement $BR(K^+\to\pi^+\nu\bar\nu)$ 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 rar...

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Detalles Bibliográficos
Autores principales: Fiorenza, Renato, 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, Briano Olvera, A, Britton, D, Brizioli, F, Brunetti, M B, 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, 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, E B, Husek, T, Hutanu, O, Hutchcroft, D, Iacobuzio, L, Iacopini, E, Imbergamo, E, Jenninger, B, Jerhot, J, Jones, R W, Kampf, K, Kekelidze, V, Kerebay, D, Kholodenko, S, Khoriauli, G, Kleimenova, A, Korotkova, A, Khotyantsev, A, Koval, M, Kozhuharov, V, Kucerova, Z, Kudenko, Y G, 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, 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 D, 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, Yu, Protopopescu, D, Raggi, M, Reyes Santos, M, 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
Lenguaje:eng
Publicado: SISSA 2022
Materias:
Nuclear Physics - Experiment
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.22323/1.402.0176
http://cds.cern.ch/record/2824774
Descripción
Sumario:The NA62 experiment reports the branching ratio measurement $BR(K^+\to\pi^+\nu\bar\nu)$ 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 $K^+\to\pi^+\nu\bar\nu$ decay, observed with a significance of $3.4\sigma$. The experiment achieves a single event sensitivity of $(0.839\pm0.054)\times10^{-11}$, corresponding to 10.0 events assuming the Standard Model branching ratio of $(8.4\pm1.0)\times10^{-11}$. The result represents the most accurate measurement achieved so far of this ultra-rare decay. Future prospects and plans for data taking from 2021 will also be presented.

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