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
2021/5/10
Journal
Physics Letters B
Volume
816
Pages
136259
Publisher
North-Holland
Description
The NA62 experiment at CERN reports searches for K+→ μ+ N and K+→ μ+ ν X decays, where N and X are massive invisible particles, using the 2016–2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O (10− 8) of the neutrino mixing parameter| U μ 4| 2 for N masses in the range 200–384 MeV/c 2 and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10–370 MeV/c 2 are reported for the first time, ranging from O (10− 5) to O (10− 7). An improved upper limit of 1.0× 10− 6 is established at 90% CL on the K+→ μ+ ν ν ν¯ branching fraction.
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Scholar articles
EC Gil, A Kleimenova, E Minucci, S Padolski, P Petrov… - Physics Letters B, 2021