28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

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

28 Jul 2020, 18:37
virtual conference

virtual conference

Talk 05. Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics


Mauro Raggi (LNF INFN)


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.

Primary author

Mauro Raggi (LNF INFN)

Presentation Materials