Search for lepton number and flavour violation in K+ and π0 decays

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Volpe, R, Akmete, A, Aliberti, R, Ambrosino, F, Ammendola, R, Angelucci, B, Antonelli, A, Anzivino, G, Arcidiacono, R, Bache, T et al (show 90 more authors) , Baeva, A, Baigarashev, D, Bandiera, L, Barbanera, M, Bern-Hard, J, Biagioni, A, Bician, L, Biino, C, Bizzeti, A, Blazek, T, Bloch-Devaux, B, Boboc, P, Bonaiuto, V, Boretto, M, Bragadireanu, M, BrianoOlvera, A, Britton, D, Brizioli, F, Brunetti, MB, Bryman, D, Bucci, F, Capussela, T, Carmignani, J ORCID: 0000-0002-1705-1061, Ceccucci, A, Cenci, P, Cerny, V, Cerri, C, Checcucci, B, Conovaloff, A, Cooper, P, Gil, EC, Corvino, M, Costantini, F, Ramusino, AC, Coward, D, D'Agostini, G, Dainton, J, Dalpiaz, P, Danielsson, H, D'Errico, M, DeSimone, N, DiFilippo, D, DiLella, 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, 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, EB, Husek, T, Hutanu, O, Hutchcroft, D ORCID: 0000-0002-4174-6509, Iacobuzio, L, Iacopini, E, Imbergamo, E, Jenninger, B, Jerhot, J and Jones, RW (2022) Search for lepton number and flavour violation in K+ and π0 decays. .

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Abstract

The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10⁻¹¹. Searches for the lepton number violating K⁺ → π⁻µ⁺e⁺ decay and the lepton flavour violating K⁺ → π⁺µ⁻e⁺ and π⁰ → µ⁻e⁺ decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes.

Item Type:	Conference Item (Unspecified)
Depositing User:	Symplectic Admin
Date Deposited:	13 Oct 2022 16:28
Last Modified:	05 Jun 2025 10:02
Open Access URL:	https://pos.sissa.it/380/426/
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3165405