3–8 Jun 2019
Bari
Europe/Rome timezone
WIN2019. The 27th International Workshop on Weak Interactions and Neutrinos.

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

4 Jun 2019, 17:00
25m
Sala Federico II (Bari)

Sala Federico II

Bari

Oral Flavor and Precision Physics Flavor and Precision Physics

Speaker

Cristina Biino (INFN Torino)

Description

The NA48/2 experiment at CERN reports the first observation of the K± → π± π0 e+ 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. 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 Kmu3 events collected in 2004 will also be presented.

Collaboration name

NA48/2 Collaboration

Primary author

Cristina Biino (INFN Torino)

Presentation materials