The NA62 experiment at CERN has collected a large sample of K+ decays in flight during several data-taking periods in 2016 − 2017 − 2018 (Run1) and the ongoing Run2, which started in 2021. Dedicated lepton-pair trigger lines have enabled a broad rare and forbidden decay programme. A review of searches for lepton flavour and number violating K+ and π0 decays with the NA62 Run1 lepton-pair dataset is presented. Ten final states have been investigated, improving on the world data in each case. Upper limits of the decay branching fractions are obtained typically at the 10−11 level, and the sensitivities are not limited by backgrounds. Prospects of the searches with the full NA62 dataset are also discussed.
LFV/LNV searches at the NA62 experiment / Panichi, I., Lenti, M., Bucci, F., Ruggiero, G., null, n.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - ELETTRONICO. - 525:(2026), pp. 019.0-019.0. [10.22323/1.525.0019]
LFV/LNV searches at the NA62 experiment
Panichi, Ilaria
;Lenti, Massimo
;Bucci, Francesca
;Ruggiero, Giuseppe
;
2026
Abstract
The NA62 experiment at CERN has collected a large sample of K+ decays in flight during several data-taking periods in 2016 − 2017 − 2018 (Run1) and the ongoing Run2, which started in 2021. Dedicated lepton-pair trigger lines have enabled a broad rare and forbidden decay programme. A review of searches for lepton flavour and number violating K+ and π0 decays with the NA62 Run1 lepton-pair dataset is presented. Ten final states have been investigated, improving on the world data in each case. Upper limits of the decay branching fractions are obtained typically at the 10−11 level, and the sensitivities are not limited by backgrounds. Prospects of the searches with the full NA62 dataset are also discussed.
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