CERN Accelerating science

Article
Title Measurement of the very rare $K^+ \rightarrow \pi^+ \nu \overline{\nu}$ decay at the NA62 experiment at CERN
Author(s)

Fiorenza, Renato (Naples U. ; INFN, Naples) ; 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

Publication Trieste : SISSA, 2022
Number of pages 5
In: PoS NuFact2021 (2022) 176
In: 22nd International Workshop on Neutrinos from Accelerators (NuFact 2021), Cagliari, Italy, 6 - 11 Sep 2021, pp.176
DOI 10.22323/1.402.0176 (publication)
Subject category Nuclear Physics - Experiment ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; NA62
Abstract 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.
Copyright/License publication: © Copyright owned by the author(s) (License: CC-BY-NC-ND-4.0)

Corresponding record in: Inspire


 Record created 2022-08-17, last modified 2022-08-17


Fulltext:
Download fulltext
PDF