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Title

First search for K+ -> pi(+) nu(nu)over-bar using the decay-in-flight technique

AuthorsGil, E. Cortina; Minucci, E.; Padolski, S.; Petrov, P.; Velghe, B.; Georgiev, G.; Kozhuharov, V; Litov, L.; Numao, T.; Bryman, D.; Fu, J.; Husek, Tomas; Kampf, K.; Zamkovsky, M.; Aliberti, R.; Khoriauli, G.; Kunze, J.; Lomidze, D.; Marchevski, R.; Peruzzo, L.; Vormstein, M.; Wanke, R.; Dalpiaz, R.; Fiorini, M.; Gamberini, E.; Neri, I; Norton, A.; Petrucci, F.; Wahl, H.; Ramusino, A. Cotta; Gianoli, A.; Iacopini, E.; Latino, G.; Lenti, M.; Bizzeti, A.; Bucci, F.; Volpe, R.; Antonelli, A.; Lamanna, G.; Lanfranchi, G.; Mannocchi, G.; Martellotti, S.; Moulson, M.; Raggi, M.; Spadaro, T.; Ambrosino, F.; Capussela, T.; Corvino, M.; Di Filippo, D.; Massarotti, R.; Mirra, M.; Napolitano, M. ; Saracino, G.; Anzivino, G.; Brizioli, F.; Imbergamo, E.; Lollini, R.; Santoni, C.; Barbanera, M.; Cenci, R.; Checcucci, B.; Duk, V; Lubrano, R.; Lupi, M.; Pepe, M.; Piccini, M.; Costantini, F.; Di Lella, L.; Doble, N.; Giorgi, M.; Giudici, S.; Pedreschi, E.; Sozzi, M.; Cerri, C.; Fantechi, R.; Piandani, R.; Pinzino, J.; Pontisso, L.; Spinella, F.; Mannelli, I; D'Agostini, G.; Biagioni, A.; Leonardi, E.; Lonardo, A.; Valente, R.; Vicini, R.; Ammendola, R.; Bonaiuto, V; Federici, L.; 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.; Enik, T.; Falaleev, V; Kekelidze, V; Korotkova, A.; Madigozhin, D.; Misheva, M.; Molokanova, N.; Movchan, S.; Polenkevich, I; Potrebenikov, Yu; Shkarovskiy, S.; Zinchenko, A.; Fedotov, S.; Gushchin, E.; Khotyantsev, A.; Kleimenova, A.; Kudenko, Y.; Kurochka, V; Medvedeva, M.; Mefodev, A.; Shaikhiev, A.; Kholodenko, S.; Kurshetsov, V; Obraztsov, V; Ostankov, A.; Semenov, V; Sugonyaev, V; Yushchenko, O.; Bician, L.; Blazek, T.; Cerny, V; Koval, M.; Kucerova, Z.; Ceccucci, A.; Danielsson, H.; De Simone, N.; Duval, F.; Doebrich, B.; Gatignon, L.; Guida, R.; Hahn, F.; Jenninger, B.; Laycock, R.; Miotto, G. Lehmann; Lichard, R.; Mapelli, A.; Massri, K.; Noy, M.; Palladino, V; Perrin-Terrin, M.; Ryjov, V; Venditti, S.; Brunetti, M. B.; Fascianelli, V; 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.; Dainton, J. B.; Fry, J. R.; Fulton, L.; Hutchcroft, D.; Maurice, E.; Ruggiero, G.; Wrona, B.; Conovaloff, A.; Cooper, R.; Coward, D.; Rubin, R.
Issue DateApr-2019
PublisherElsevier BV
CitationPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 791: 156- 166 (2019)
AbstractThe NA62 experiment at the CERN SPS reports the first search for K+ -> pi(+) nu(nu) over bar using the decay-in-flight technique, based on a sample of 1.21 x10(11) K+ decays collected in 2016. The single event sensitivity is 3.15 x10(-10), corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14 x10(-10) on the K+ -> pi(+) nu(nu) over bar branching ratio at 95% CL.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2019.01.067
URIhttp://hdl.handle.net/10261/206848
Identifiersdoi: 10.1016/j.physletb.2019.01.067
issn: 0370-2693
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