Recent results from the NA62 experiment at CERN

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, Mb; Bryman, D; Bucci, F; Capussela, T; Carmignani, J; Ceccucci, A; Cenci, P; Ceoletta, M; 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, Jb; Dalpiaz, P; Danielsson, H; De Martino, B; D’Errico, M; De Simone, N; Di Filippo, D; Di Lella, L; Doble, N; Döbrich, 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; 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; 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; 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; Reyes Santos, M; Rodriguez Rivera, K; Romagnoni, M; Romano, A; Rosa, I; Rubin, P; Ruggiero, G; Ryjov, V; Sadovsky, A; Salamon, A; Sanders, J; 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; Wahl, H; Wanke, R; Wong, V; Wrona, B; Yushchenko, O; Zamkovsky, M; A. Zinchenko.,

doi:10.1016/j.nuclphysbps.2023.11.015

The NA62 experiment at CERN collected the world's largest data set of charged kaon decays in 2016-2018, leading to the most precise measurement of the branching fraction of the ultra-rare K+→π+νν‾ decay, based on 20 candidates. This provides evidence for the observation of the K+→π+νν‾ decay with a significance of 3.4σ. This measurement is also used to set limits on B(K+→π+X), where X is a scalar or pseudo-scalar particle. The analysis of the full 2016-2018 data sample is reviewed. More recent results from NA62 analyses of K+→π0e+νγ, K+→π+μ+μ− and K+→π+γγ decays, using data samples recorded in 2017–2018, are also reported. The radiative kaon decay K+→π0e+νγ (Ke3γ) is studied with a data sample of O(100k) Ke3γ candidates with sub-percent background contamination. Final results of the most precise measurements of the Ke3γ branching ratios and T-asymmetry are presented. The K+→π+μ+μ− sample comprises about 27k signal events with negligible background contamination, and the results presented include the most precise determination of the branching fraction and the decay form factor. The K+→π+γγ sample contains about 4k signal events with 10% background contamination, and the preliminary analysis results improve the precision of the branching fraction measurement by a factor of 3 with respect to previous measurements. An overview of the latest NA62 results and future prospects for the experiment is presented.

Akmete, A., Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., et al. (2023). Recent results from the NA62 experiment at CERN. NUCLEAR AND PARTICLE PHYSICS PROCEEDINGS [10.1016/j.nuclphysbps.2023.11.015].