The NA62 experiment reports the branching ratio measurement BR(K+ → π+ν(Equation presented)) 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+ → π+ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. 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.
Measurement of the very rare K+ → π+ν(Equation presented) decay at the NA62 experiment at CERN / Fiorenza, R.; 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.; 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.; 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.; 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.; 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.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 402:(2022). (Intervento presentato al convegno 22nd International Workshop on Neutrinos from Accelerators, NuFact 2021 tenutosi a ita nel 2021).
Measurement of the very rare K+ → π+ν(Equation presented) decay at the NA62 experiment at CERN
Fiorenza R.
;Ambrosino F.;Brunetti M. B.;Capussela T.;Corvino M.;D'Errico M.;Di Filippo D.;Massarotti P.;Mirra M.;Napolitano M.;Saracino G.;
2022
Abstract
The NA62 experiment reports the branching ratio measurement BR(K+ → π+ν(Equation presented)) 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+ → π+ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
