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Aliberti, R, Ambrosino, F, Ammendola, R, Angelucci, B, Antonelli, A, Anzivino, G, Arcidiacono, R, Bache, T, Baeva, A, Baigarashev, D et al (show 192 more authors) , Barbanera, M, Bernhard, J, Biagioni, A, Bician, L, Biino, C, Bizzeti, A, Blazek, T, Bloch-Devaux, B, Bonaiuto, V, Boretto, M, Bragadireanu, AM, 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, Gil, E Cortina, Corvino, M, Costantini, F, Ramusino, A Cotta, Coward, D, D'Agostini, G, Dainton, JB, Dalpiaz, P, Danielsson, H, De Simone, N, Di Filippo, D, Di Lella, L, Doble, N, Duk, V, Duval, F, Dobrich, B, Emelyanov, D, Engelfried, J, Enik, T, Estrada-Tristan, N, Falaleev, V, Fantechi, R, Fascianelli, V, Federici, L, Fedotov, S, Filippi, A, Fiorini, M, Fry, JR, Fu, J, Fucci, A, Fulton, L, Gamberini, E, Gatignon, L, Georgiev, G, Ghinescu, SA, 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, OE, Hutchcroft, D 
ORCID: 0000-0002-4174-6509, Iacobuzio, L, Iacopini, E, Imbergamo, E, Jenninger, B, Jerhot, J, Jones, RWL, 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, Lamanna, G, Lanfranchi, G, Lari, E, Latino, G, Laycock, P, Lazzeroni, C, Miotto, G Lehmann, Lenti, M, 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, Yu, 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, Sozzi, M, Spadaro, T, Spinella, F, Sturgess, A, Sugonyaev, V, 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 and Zinchenko, A
(2021)
Search for Lepton Number and Flavor Violation in K+ and pi(0) Decays.
PHYSICAL REVIEW LETTERS, 127 (13).
131802-.
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Abstract
Searches for the lepton number violating K^{+}→π^{-}μ^{+}e^{+} decay and the lepton flavor violating K^{+}→π^{+}μ^{-}e^{+} and π^{0}→μ^{-}e^{+} decays are reported using data collected by the NA62 experiment at CERN in 2017-2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: B(K^{+}→π^{-}μ^{+}e^{+})<4.2×10^{-11}, B(K^{+}→π^{+}μ^{-}e^{+})<6.6×10^{-11} and B(π^{0}→μ^{-}e^{+})<3.2×10^{-10}. These results improve by 1 order of magnitude over previous results for these decay modes.
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