Abstract
The NA62 experiment at CERN reports results from the study of the flavour-changing neutral current decay K + → π + μ + μ − using a data sample recorded in 2017–2018 with a dedicated pre-scaled di-muon trigger. The sample comprises about 28k signal events with negligible background contamination, and the presented results include the most precise determination of the corresponding branching fraction and the form factor parameters.
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