abstract

• 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).

authors

• Engelfried Jatzkowski Jurgen
• The NA62 Collaboration

publication date

• 2021-01-01

published in

• Proceedings of Science  Proceedings

keywords

• Branching ratio; Confidence levels; Lepton number; Lepton number violations; Upper limits; Elementary particles

Digital Object Identifier (DOI)

PubMed ID

start page

end page

volume

• 390

issue