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Journal Article

Search for K+ decays into the π+e+e−e+e− final state


The NA62 collaboration, 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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The NA62 collaboration (2023). Search for K+ decays into the π+e+e−e+e− final state. Physics Letters B, 846, 138193. doi:10.1016/j.physletb.2023.138193.

Cite as: https://hdl.handle.net/21.11116/0000-000F-1118-3
The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10^−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10^−11. Upper limits at 90% CL are obtained at the level of 10^−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.