abstract
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A search for the lepton number violating K ? p-µ e and lepton flavour violating K ? p-µ-e decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90%25 confidence level: B(K ? p-µ e ) < 4.2 × 10-11 and B(K ? p µ-e ) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
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A search for the lepton number violating K%2b ? p-µ%2be%2b and lepton flavour violating K%2b ? p-µ-e%2b decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90%25 confidence level: B(K%2b ? p-µ%2be%2b) < 4.2 × 10-11 and B(K%2b ? p%2bµ-e%2b) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
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