Search for $K^+$ decays to a muon and invisible particles
Phys.Lett.B 816 (2021) 136259, 2021.
The NA62 collaboration

Abstract (data abstract)
CERN-SPS. Upper limits at 90% CL on HNL coupling |Umu4|^2 vs mass from a production search in K+ --> mu+N decays at the NA62 experiment at CERN.

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