International Conference on Kaon Physics 2019

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

10 Sept 2019, 15:15

25m

Aula Magna (University of Perugia (Italy))

Talk Semileptonic and 4 bodies kaon decays and CKM matrix

Speaker

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

Description

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.

Presentation materials

kaon19_bbloch_pp0ee.pdf