Search for heavy neutral lepton production in $K^+$ decays

The NA62 collaboration
Phys.Lett.B 778 (2018) 137-145, 2018.

Abstract (data abstract)
Upper limits at 90% CL for the elements of the extended neutrino mixing matrix |Ue4|^2 and |Umu4|^2 depending on the assumed heavy neutral lepton mass.

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