Authors
E Cortina Gil, Alina Kleimenova, E Minucci, S Padolski, P Petrov, A Shaikhiev, R Volpe, Toshio Numao, Yevgeniy Petrov, B Velghe, D Bryman, J Fu, T Husek, J Jerhot, K Kampf, M Zamkovsky, R Aliberti, G Khoriauli, J Kunze, D Lomidze, L Peruzzo, M Vormstein, R Wanke, P Dalpiaz, M Fiorini, I Neri, A Norton, F Petrucci, H Wahl, A Cotta Ramusino, A Gianoli, E Iacopini, G Latino, M Lenti, A Parenti, A Bizzeti, F Bucci, A Antonelli, G Georgiev, V Kozhuharov, G Lanfranchi, S Martellotti, M Moulson, T Spadaro, F Ambrosino, T Capussela, M Corvino, D Di Filippo, P Massarotti, M Mirra, M Napolitano, G Saracino, G Anzivino, F Brizioli, E Imbergamo, R Lollini, R Piandani, C Santoni, M Barbanera, P Cenci, B Checcucci, P Lubrano, M Lupi, M Pepe, M Piccini, F Costantini, L Di Lella, N Doble, M Giorgi, S Giudici, G Lamanna, E Lari, E Pedreschi, M Sozzi, C Cerri, R Fantechi, L Pontisso, F Spinella, I Mannelli, G d'Agostini, M Raggi, A Biagioni, E Leonardi, A Lonardo, P Valente, P Vicini, R Ammendola, V Bonaiuto, A Fucci, A Salamon, F Sargeni, R Arcidiacono, B Bloch-Devaux, M Boretto, E Menichetti, E Migliore, D Soldi, C Biino, A Filippi, F Marchetto, J Engelfried, N Estrada-Tristan, AM Bragadireanu, SA Ghinescu, OE Hutanu, A Baeva, D Baigarashev, D Emelyanov, T Enik, V Falaleev, V Kekelidze, A Korotkova, L Litov, D Madigozhin, M Misheva, N Molokanova, S Movchan, I Polenkevich, Yu Potrebenikov, S Shkarovskiy, A Zinchenko, S Fedotov, E Gushchin, A Khotyantsev, Y Kudenko, V Kurochka, M Medvedeva, A Mefodev, S Kholodenko, V Kurshetsov, V Obraztsov, A Ostankov, V Semenov, V Sugonyaev, O Yushchenko, L Bician, T Blazek, V Cerny, Z Kucerova, J Bernhard, A Ceccucci, H Danielsson, N De Simone, F Duval, B Döbrich, L Federici, E Gamberini, L Gatignon, R Guida, F Hahn
Publication date
2020/8/10
Journal
Physics Letters B
Volume
807
Pages
135599
Publisher
North-Holland
Description
A search for heavy neutral lepton (N) production in K+→ e+ N decays using the data sample collected by the NA62 experiment at CERN in 2017–2018 is reported. Upper limits of the extended neutrino mixing matrix element| U e 4| 2 are established at the level of 10− 9 over most of the accessible heavy neutral lepton mass range 144–462 MeV/c 2, with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The| U e 4| 2 range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c 2.
Scholar articles
EC Gil, A Kleimenova, E Minucci, S Padolski, P Petrov… - Physics Letters B, 2020