abstract

• Searches for heavy neutral lepton production in K%2b ? e%2bN and K%2b ? µ%2bN decays using the data set collected by the NA62 experiment at CERN in 2016-18 are presented. Upper limits on the elements of the extended neutrino mixing matrix and are established at the levels of 10-9 and 10-8, respectively, improving on the earlier searches for heavy neutral lepton production and decays in the kinematically accessible mass range. Searches for the K%2b ? µ%2bvvv and K%2b ? µ%2bvX decays, where X is a new light invisible particle, are also reported. © 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

• Data set; Lepton productions; Mixing matrix; Neutrino mixing; Upper limits

Digital Object Identifier (DOI)

PubMed ID

start page

end page

volume

• 398

issue