Search for lepton number and flavour violation in K+ and pi0 decays
R. Volpe* on behalf of the NA62 Collaboration
March 02, 2022
May 24, 2022
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 π 0 → 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.
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