Latest results on rare kaon decays from the NA48/2 experiment at CERN

The NA48/2 collaboration

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The NA48/2 experiment at CERN reports the first observation of the K± ? p±p0e+e- decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004 will also be presented.

Original languageEnglish (US)
Article number413
JournalProceedings of Science
StatePublished - Apr 15 2021
Event40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Czech Republic
Duration: Jul 28 2020Aug 6 2020

ASJC Scopus subject areas

  • General


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