Searches for lepton number violating K+ decays

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Colleges, School and Institutes


The NA62 experiment at CERN reports a search for the lepton number violating decays K+→πe+e+ and K+→πμ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.


Original languageEnglish
Article number134794
Number of pages9
JournalPhysics Letters B
Early online date23 Jul 2019
Publication statusPublished - 10 Oct 2019