3 years ago

# Search for heavy neutral lepton production in K+ decays

A search for heavy neutral lepton production in $K +$ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the $10 − 7$ to $10 − 6$ level are established on the elements of the extended neutrino mixing matrix $| U e 4 | 2$ and $| U μ 4 | 2$ for heavy neutral lepton mass in the ranges 170–448 MeV/$c 2$ and 250–373 MeV/$c 2$, respectively. This improves on the previous limits from HNL production searches over the whole mass range considered for $| U e 4 | 2$, and above 300 MeV/$c 2$ for $| U μ 4 | 2$.

Publisher URL: www.sciencedirect.com/science

DOI: S037026931830039X

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