Speaker
Summary
The kaon physics has a long standing tradition at CERN SPS
and the rare kaon decays offer a unique possibility to probe a large variety of Standard Model extensions. The NA48/2 experiment at CERN SPS performed searches for the lepton number violating decay $K^\pm \to \pi^\mp \mu^\p \mu^\pm$, for new heavy or Majorana neutrinos in $K^\pm \to \mu^\pm N$, $N\to \pi^\pm \mu^\mp$, and for new degrees of freedom in the channel $K^\pm \to \pi^\pm X$ with X decaying into two muons. The primary goal of the NA62 experiment is the measurement of the branching fraction of the ultra rare decay $K^+ \to \pi^+ \nu \bar{\nu}$ with 10\% precision. About $10^{13}$ kaon decays will be collected allowing a diverse programme of searches for rare and exotic processes. The obtained results from the NA48/2 experiment and the expected performance of the NA62 experiment will be presented and discussed.
