First observation and study of the K± → π±π0e+e− decay

J. R. Batley, Evgueni Goudzovski, NA48/2 collaboration

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The NA48/2 experiment at CERN reports the first observation of the K ±→π ±π 0e +e decay from an exposure of 1.7×10 11 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, BR(K ±→π ±π 0e +e )=(4.24±0.14)×10 −6. 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.

Original languageEnglish
Pages (from-to)552-561
Number of pages10
JournalPhysics Letters B
Early online date29 Nov 2018
Publication statusPublished - 10 Jan 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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