Abstract
Searches for the lepton number violating decay and the lepton flavor violating and decays are reported using data collected by the NA62 experiment at CERN in 2017–2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: , and . These results improve by 1 order of magnitude over previous results for these decay modes.
- Received 17 May 2021
- Accepted 22 July 2021
DOI:https://doi.org/10.1103/PhysRevLett.127.131802
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Published by the American Physical Society