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

The NA48/2 collaboration

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+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, BR(K±→π±π0e+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 (US)
Pages (from-to)552-561
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Jan 10 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'First observation and study of the K± → π±π0e+e decay'. Together they form a unique fingerprint.

Cite this