A search for the K+→μ−νe+e+ decay

NA62 Collaboration

doi:10.1016/j.physletb.2023.137679

A search for the K⁺→μ⁻νe⁺e⁺ decay

NA62 Collaboration

Physics and Astronomy

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Abstract

A search for the K⁺ → μ⁻νe⁺e⁺ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neu- trino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1 × 10⁻¹¹ is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.

Original language	English
Article number	137679
Number of pages	7
Journal	Physics Letters B
Volume	838
Early online date	10 Jan 2023
DOIs	https://doi.org/10.1016/j.physletb.2023.137679
Publication status	Published - 10 Mar 2023

Keywords

Kaon decays
Lepton number violation
Lepton flavour violation

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Cite this

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title = "A search for the K+→μ−νe+e+ decay",

abstract = "A search for the K+ → μ−νe+e+ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neu- trino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1 × 10−11 is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.",

keywords = "Kaon decays, Lepton number violation, Lepton flavour violation",

author = "{NA62 Collaboration} and Evgueni Goudzovski",

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AB - A search for the K+ → μ−νe+e+ decay, forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neu- trino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of 8.1 × 10−11 is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search.

KW - Kaon decays

KW - Lepton number violation

KW - Lepton flavour violation

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