Searches for heavy neutral lepton production at the NA62 experiment
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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)
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Data set; Lepton productions; Mixing matrix; Neutrino mixing; Upper limits
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