Precision tests of the Standard Model with kaon decays at CERN

Recent results and prospects for precision tests of the Standard Model in kaon decay in flight experiments at CERN are presented. A measurement of the ratio of leptonic decay rates of the charged kaon at a 0.4% precision constrains the parameter space of new physics models with, for example, an extended Higgs sector. Searches for neutrino mass states and the dark photon in the 100 MeV = c 2 mass range based on samples collected in 2003-2007 are in progress and prospects will be discussed. The NA62 experiment starting in 2014 will search for a range of lepton number and lepton flavour violating decays of the charged kaon and the neutral pion at improved sensitivities down to 10-12, probing new physics scenarios involving, for example, heavy Majorana neutrinos. Prospects for the NA62 L0 trigger strategy for rare and forbidden decays will be discussed.