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Searches for lepton number violating K+ decays

2019; Elsevier BV; Volume: 797; Linguagem: Inglês

10.1016/j.physletb.2019.07.041

1873-2445

E. Cortina, E. Minucci, S. Padolski, Plamen Petrov, B. Velghe, D. Bryman, Jie Fu, Toshio Numao, Y. Petrov, T. Husek, Karol Kampf, Michal Zamkovsky, J. Jerhot, R. Aliberti, Gia Khoriauli, Jonas Kunze, D. Lomidze, R. Marchevski, L. Peruzzo, M. Vormstein, R. Wanke, A. Cotta Ramusino, P. Dalpiaz, M. Fiorini, Enrico Gamberini, A. Gianoli, Ilaria Neri, A. Norton, Ferruccio Petrucci, H. Wahl, Andrea Bizzeti, F. Bucci, E. Iacopini, G. Latino, M. Lenti, A. Parenti, R. Volpe, A. Antonelli, Francesco Gonnella, G. Lamanna, G. Lanfranchi, Giampaolo Mannocchi, S. Martellotti, Matthew Moulson, V. Kozhuharov, L. Litov, G. Georgiev, M. Raggi, Tommaso Spadaro, F. Ambrosino, T. Capussela, M. Corvino, Domenico Di Filippo, P. Massarotti, M. Mirra, Marco Napolitano, Giulio Saracino, Giuseppina Anzivino, E. Imbergamo, Riccardo Lollini, Cristiano Santoni, F. Brizioli, M. Barbanera, P. Cenci, B. Checcucci, V. Duk, M. Lupi, M. Pepé, B. Pietrzyk, P. Lubrano, Flavio Costantini, Niels Doble, Marcello Giorgi, Sergio Giudici, Enrico Lari, J. Pinzino, L. Pontisso, Marco Sozzi, Luigi Di Lella, Italo Mannelli, Claudio Cerri, R. Fantechi, E. Pedreschi, R. Piandani, Franco Spinella, Andrea Biagioni, G. D’Agostini, Emanuele Leonardi, A. Lonardo, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, N. De Simone, Luca Federici, A. Fucci, Á. Salamon, Fausto Sargeni, R. Arcidiacono, C. Biino, B. Bloch-Devaux, M. Boretto, A. Filippi, Lorenza Iacobuzio, F. Marchetto, E. Menichetti, E. Migliore, D. Soldi, J. Engelfried, Nora Estrada-Tristan, Alexandru Mario Bragadireanu, S. A. Ghinescu, Ovidiu Emanuel Hutanu, T. Enik, Valeri Falaleev, V. Kekelidze, A. Korotkova, D. Madigozhin, Milena Misheva, Natalia Molokanova, Sergei Movchan, Irina Polenkevich, Yuri Potrebenikov, S. Shkarovskiy, Alexander Zinchenko, S. Fedotov, A. Khotyantsev, E. Gushchin, Alina Kleimenova, Y. Kudenko, Viktoriia Kurochka, Mariia Medvedeva, Aleksandr Mefodev, A. Shaikhiev, S. Kholodenko, V. Kurshetsov, V. Obraztsov, A. Ostankov, V. Semenov, V. Sugonyaev, Oleg Yushchenko, L. Bician, Tomas Blazek, Vladimir Cerny, M. Koval, Zuzana Kučerová, A. Ceccucci, J. Bernhard, Hans Danielsson, Babette Döbrich, F. Duval, Lau Gatignon, Roberto Guida, Ferdinand Hahn, Eva Barbara Holzer, B. Jenninger, P. Laycock, Giovanna Lehmann Miotto, Peter Lichard, A. Mapelli, Matthew Noy, V. Palladino, M. Perrin‐Terrin, G. Ruggiero, V. Ryjov, Simone Schuchmann, Stefano Venditti, M. B. Brunetti, T. Bache, E. Goudzovski, C. Lazzeroni, V. Fascianelli, N. Lurkin, F. Newson, C. J. Parkinson, A. Romano, A. Sergi, A. Sturgess, J. Swallow, H. F. Heath, R. Page, S. M. Trilov, Bruno Angelucci, D. Britton, D. Protopopescu, C. Graham, R. W. L. Jones, J. B. Dainton, J. R. Fry, L. Fulton, D. Hutchcroft, J. Carmignani, K. Massri, E. Maurice, B. Wrona, A. Conovaloff, Peter Cooper, D. Coward, Philip David Rubin,

Neutrino Physics Research

The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.