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

The NA62 collaboration,

doi:10.1016/j.physletb.2023.138193

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

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-1118-3 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-1119-2

Genre: Journal Article

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The NA62 collaboration¹, Author

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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Abstract: 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−.

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Dates: Date issued: 2023

Publication Status: Issued

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Identifiers: Other: MPP-2023-188
URI: https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2023-188
DOI: 10.1016/j.physletb.2023.138193
URI: https://inspirehep.net/literature/2676523

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Title: Physics Letters B

Abbreviation : Phys.Lett.B

Source Genre: Journal

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Pages: - Volume / Issue: 846 Sequence Number: - Start / End Page: 138193 Identifier: -