Search for K+ decays to a lepton and invisible particles

Akmete, A. et al. (2022) Search for K+ decays to a lepton and invisible particles. In: 7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021, Bergen, Norway, 29 Nov-3 Dec 2021, (doi: 10.22323/1.405.0056)

Abstract

The NA62 experiment at CERN reports searches for K+→e+N , K+→μ+N and K+→μ+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(10−9) and O(10−8) on the neutrino mixing parameter |Ue4|2 and |Uμ4|2 , improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range. 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 upper limit of 1.0⋅10−6 is established at 90\% CL on the K+→μ+ννν¯ branching fraction.

• Item Type: Conference Proceedings
• Additional Information: Proceedings of Science, volume 405. NA62 Collaboration.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Norton, Dr Alan and Jones, Mr Russell and Angelucci, Dr Bruno and Britton, Professor David and Protopopescu, Dr Dan
• Authors: Akmete, A., Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., Anzivino, G., Arcidiacono, R., Bache, T., Baeva, A., Baigarashev, D., Bandiera, L., Barbanera, M., Bernhard, J., Biagioni, A., Bician, L., Biino, C., Bizzeti, A., Blazek, T., Bloch-Devaux, B., Boboc, V., Bonaiuto, M., Boretto, M., Bragadireanu, M., Briano Olvera, A., Britton, D., Brizioli, F., Brunetti, M.B., Bryman, D., Bucci, F., Capussela, T., Carmignani, J., Ceccucci, A., Cenci, P., Cerny, V., Cerri, C., Checcucci, B., Conovaloff, A., Cooper, P., Cortina Gil, E., Corvino, M., Costantini, F., Cotta Ramusino, A., Coward, D., Cretaro, P., D'Agostini, G., Dainton, J., Dalpiaz, P., Danielsson, H., D'Arrico, M., De Simone, N., Di Filippo, D., Di Lella, L., Doble, N., Dobrich, B., Duval, F., Duk, V., Emelyanov, D., Engelfried, J., Enik, T., Estrada-Tristan, N., Falaleev, V., Fantechi, R., Fascianelli, V., Federici, L., Fedotov, S., Filippi, A., Fiorenza, R., Fiorini, M., Frezza, O., Fry, J., Fu, J., Fucci, A., Fulton, L., Gamberini, E., Gatignon, L., Georgiev, G., Ghinescu, S., Gianoli, A., Giorgi, M., Giudici, S., Gonnella, F., Gorshanov, K., Goudzovski, E., Graham, C., Guida, R., Gushchin, E., Hahn, F., Heath, H., Henshaw, J., Hives, Z., Holzer, E.B., Husek, T., Hutanu, O., Hutchcroft, D., Iacobuzio, L., Iacopini, E., Imbergamo, E., Jenninger, B., Jones, R.W., Kampf, K., Kekelidze, V., Kereibay, D., Kholodenko, S., Khoriauli, G., Khotyantsev, A., Kleimenova, A., Korotkova, A., Koval, M., Kozhuharov, V., Kucerova, Z., Kudenko, Y., Kunze, J., Kurochka, V., Kurshetsov, V., Lanfranchi, G., Lamanna, G., Lari, E., Latino, G., Laycock, P., Lazzeroni, C., Lenti, M., Lehmann Miotto, G., Leonardi, E., Lichard, P., Litov, L., Lo Chiatto, P., Lollini, R., Lomidze, D., Lonardo, A., Lubrano, P., Lupi, M., Lurkin, N., Madigozhin, D., Mannelli, I., Mapelli, A., Marchetto, F., Marchevski, R., Martellotti, S., Massarotti, P., Massri, K., Maurice, E., Mazzolari, A., Medvedeva, M., Menichetti, E., Migliore, E., Minucci, E., Mirra, M., Misheva, M., Molokanova, N., Moulson, M., Movchan, S., Napolitano, M., Neri, I., Newson, F., Norton, A., Noy, M., Numao, T., Obraztsov, V., Okhotnikov, A., Ostankov, A., Padolski, S., Page, R., Palladino, V., Panichi, I., Parenti, A., Parkinson, C., Pedreschi, E., Pepe, M., Perrin-Terrin, M., Peruzzo, L., Petrov, P., Petrov, Y., Petrucci, F., Piandani, R., Piccini, M., Pinzino, J., Polenkevich, I., Pontisso, L., Potrebenikov, Y., Protopopescu, D., Raggi, m., Reyes Santos, M., Romagnoni, M., Romano, A., Rubin, P., Ruggiero, G., Ryjov, V., Sadovsky, A., Salamon, A., Santoni, C., Saracino, g., Sargeni, F., Schuchmann, S., Semenov, V., Sergi, A., Shaikhiev, A., Shkarovskiy, S., Soldani, M., Soldi, D., Sozzi, M., Spadaro, T., Spinella, F., Sturgess, A., Sugonyaev, V., Swallow, J., Sytov, A., Tinti, G., Tomczak, A., Trilov, S., Turisini, M., Valente, P., Velghe, B., Venditti, S., Vicini, P., Volpe, R., Vormstein, M., Wahl, H., Wanke, R., Wong, V., Wrona, B., Yushchenko, O., Zamkovsky, M., and Zinchenko, A.
• College/School: College of Science and Engineering > School of Physics and Astronomy
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