Sep 10 – 13, 2019
University of Perugia (Italy)
Europe/Zurich timezone

First observation and study of the K± → π±π0e+e− decay with the NA48/2 experiment at CERN

Sep 10, 2019, 3:15 PM
Aula Magna (University of Perugia (Italy))

Aula Magna

University of Perugia (Italy)

Piazza dell'Università 1, 06123 Perugia (Italy)


Brigitte Bloch-Devaux (Universita e INFN Torino (IT))


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. 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.

Primary author

Brigitte Bloch-Devaux (Universita e INFN Torino (IT))

Presentation materials