An investigation of the very rare K⁺ π⁺νν̅ decay
- Cortina Gil, E.
- Kleimenova, A.
- Minucci, E.
- Padolski, S.
- Petrov, P.
- Shaikhiev, A.
- Volpe, R.
- Numao, T.
- Velghe, B.
- Bryman, D.
- Fu, J.
- Husek, T.
- Jerhot, J.
- Kampf, K.
- Zamkovsky, M.
- Aliberti, R.
- Khoriauli, G.
- Kunze, J.
- Lomidze, D.
- Marchevski, R.
- Peruzzo, L.
- Vormstein, M.
- Wanke, R.
- Dalpiaz, P.
- Fiorini, M.
- Neri, I.
- Norton, A.
- Petrucci, F.
- Wahl, H.
- Cotta Ramusino, A.
- Gianoli, A.
- Iacopini, E.
- Latino, G.
- Lenti, M.
- Parenti, A.
- Bizzeti, A.
- Bucci, F.
- Antonelli, A.
- Georgiev, G.
- Kozhuharov, V.
- Lanfranchi, G.
- Martellotti, S.
- Moulson, M.
- Spadaro, T.
- Ambrosino, F.
- Capussela, T.
- Corvino, M.
- Di Filippo, D.
- Massarotti, P.
- Mirra, M.
- Napolitano, M.
- Saracino, G.
- Anzivino, G.
- Brizioli, F.
- Imbergamo, E.
- Lollini, R.
- Piandani, R.
- Santoni, C.
- Barbanera, M.
- Cenci, P.
- Checcucci, B.
- Lubrano, P.
- Lupi, M.
- Pepe, M.
- Piccini, M.
- Costantini, F.
- Di Lella, L.
- Doble, N.
- Giorgi, M.
- Giudici, S.
- Lamanna, G.
- Lari, E.
- Pedreschi, E.
- Sozzi, M.
- Cerri, C.
- Fantechi, R.
- Pontisso, L.
- Spinella, F.
- Mannelli, I.
- D’Agostini, G.
- Raggi, M.
- Biagioni, A.
- Leonardi, E.
- Lonardo, A.
- Valente, P.
- Vicini, P.
- Ammendola, R.
- Bonaiuto, V.
- Fucci, A.
- Salamon, A.
- Sargeni, F.
- Arcidiacono, R.
- Bloch-Devaux, B.
- Boretto, M.
- Menichetti, E.
- Migliore, E.
- Soldi, D.
- Biino, C.
- Filippi, A.
- Marchetto, F.
- Engelfried, J.
- Estrada-Tristan, N.
- Bragadireanu, A. M.
- Ghinescu, S. A.
- Hutanu, O. E.
- Baeva, A.
- Baigarashev, D.
- Emelyanov, D.
- Enik, T.
- Falaleev, V.
- Kekelidze, V.
- Korotkova, A.
- Litov, L.
- Madigozhin, D.
- Misheva, M.
- Molokanova, N.
- Movchan, S.
- Polenkevich, I.
- Potrebenikov, Yu.
- Shkarovskiy, S.
- Zinchenko, A.
- Fedotov, S.
- Gushchin, E.
- Khotyantsev, A.
- Kudenko, Y.
- Kurochka, V.
- Medvedeva, M.
- Mefodev, A.
- Kholodenko, S.
- Kurshetsov, V.
- Obraztsov, V.
- Ostankov, A.
- Semenov, V.
- Sugonyaev, V.
- Yushchenko, O.
- Bician, L.
- Blazek, T.
- Cerny, V.
- Kucerova, Z.
- Bernhard, J.
- Ceccucci, A.
- Danielsson, H.
- De Simone, N.
- Duval, F.
- Döbrich, B.
- Federici, L.
- Gamberini, E.
- Gatignon, L.
- Guida, R.
- Hahn, F.
- Holzer, E. B.
- Jenninger, B.
- Koval, M.
- Laycock, P.
- Lehmann Miotto, G.
- Lichard, P.
- Mapelli, A.
- Massri, K.
- Noy, M.
- Palladino, V.
- Perrin-Terrin, M.
- Pinzino, J.
- Ryjov, V.
- Schuchmann, S.
- Venditti, S.
- Bache, T.
- Brunetti, M. B.
- Duk, V.
- Fascianelli, V.
- Fry, J. R.
- Gonnella, F.
- Goudzovski, E.
- Iacobuzio, L.
- Lazzeroni, C.
- Lurkin, N.
- Newson, F.
- Parkinson, C.
- Romano, A.
- Sergi, A.
- Sturgess, A.
- Swallow, J.
- Heath, H.
- Page, R.
- Trilov, S.
- Angelucci, B.
- Britton, D.
- Graham, C.
- Protopopescu, D.
- Carmignani, J.
- Dainton, J. B.
- Jones, R. W. L.
- Ruggiero, G.
- Fulton, L.
- Hutchcroft, D.
- Maurice, E.
- Wrona, B.
- Conovaloff, A.
- Cooper, P.
- Coward, D.
- Rubin, P.
DOIAbstract
The NA62 experiment reports an investigation of the K+→π+νν¯¯¯ mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+→π+νν¯¯¯ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48+0.72−0.48) × 10−10, are currently the most precise results worldwide, and are able to...
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