Search for K+ decays to a muon and invisible particles
- Gil, E Cortina
- Kleimenova, A
- Minucci, E
- Padolski, S
- Petrov, P
- Shaikhiev, A
- Volpe, R
- Numao, T
- Petrov, Y
- Velghe, B
- Bryman, D
- Fu, J
- Husek, T
- Jerhot, J
- Kampf, K
- Zamkovsky, M
- Aliberti, R
- Khoriauli, G
- Kunze, J
- Lomidze, D
- Peruzzo, L
- Vormstein, M
- Wanke, R
- Dalpiaz, P
- Fiorini, M
- Neri, I
- Norton, A
- Petrucci, F
- Wahl, H
- Ramusino, A Cotta
- Gianoli, A
- Iacopini, E
- Latino, G
- Lenti, M
- Parenti, A
- Bizzeti, A
- Bucci, F
- Antonelli, A
- Georgiev, G
- Kozhuharov, V
- Lanfranchi, G
- Martellotti, S
- Moulson, M
- Spadaro, T
- Ambrosino, F
- Capussela, T
- Corvino, M
- DiFilippo, D
- Massarotti, P
- Mirra, M
- Napolitano, M
- Saracino, G
- Anzivino, G
- Brizioli, F
- Imbergamo, E
- Lollini, R
- Piandani, R
- Santoni, C
- Barbanera, M
- Cenci, P
- Checcucci, B
- Lubrano, P
- Lupi, M
- Pepe, M
- Piccini, M
- Costantini, F
- Di Lella, L
- Doble, N
- Giorgi, M
- Giudici, S
- Lamanna, G
- Lari, E
- Pedreschi, E
- Sozzi, M
- Cerri, C
- Fantechi, R
- Pontisso, L
- Spinella, F
- Mannelli, I
- D'Agostini, G
- Raggi, M
- Biagioni, A
- Leonardi, E
- Lonardo, A
- Valente, P
- Vicini, P
- Ammendola, R
- Bonaiuto, V
- 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, AM
- Ghinescu, SA
- Hutanu, OE
- Baeva, A
- Baigarashev, D
- Emelyanov, D
- Enik, T
- Falaleev, V
- Kekelidze, V
- Korotkova, A
- Litov, L
- Madigozhin, D
- Misheva, M
- Molokanova, N
- Movchan, S
- Polenkevich, I
- Potrebenikov, Yu
- Shkarovskiy, S
- Zinchenko, A
- Fedotov, S
- Gushchin, E
- Khotyantsev, A
- Kudenko, Y
- Kurochka, V
- Medvedeva, M
- Mefodev, A
- Kholodenko, S
- Kurshetsov, V
- Obraztsov, V
- Ostankov, A
- Semenov, V
- Sugonyaev, V
- Yushchenko, O
- Bician, L
- Blazek, T
- Cerny, V
- Kucerova, Z
- Bernhard, J
- Ceccucci, A
- Danielsson, H
- De Simone, N
- Duval, F
- Dobrich, B
- Federici, L
- Gamberini, E
- Gatignon, L
- Guida, R
- Hahn, F
- Holzer, EB
- Jenninger, B
- Koval, M
- Laycock, P
- Miotto, G Lehmann
- Lichard, P
- Mapelli, A
- Marchevski, R
- Massri, K
- Noy, M
- Palladino, V
- Perrin-Terrin, M
- Pinzino, J
- Ryjov, V
- Schuchmann, S
- Venditti, S
- Bache, T
- Brunetti, MB
- Duk, V
- Fascianelli, V
- Fry, JR
- Gonnella, F
- Goudzovski, E
- Henshaw, J
- 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
- Carmignani, J
- Dainton, JB
- Jones, RWL
- Ruggiero, G
- Fulton, L
- Hutchcroft, D
- Maurice, E
- Wrona, B
- Conovaloff, A
- Cooper, P
- Coward, D
- Rubin, P
DOIAbstract
The NA62 experiment at CERN reports searches for K+→μ+N and K+→μ+νX 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 |Uμ4|2 for N masses in the range 200–384 MeV/c2 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/c2 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+ννν¯ branching fraction
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