Narrow Results

The NA48/2 experiment presents preliminary measurements of the form factors of the charged kaon semileptonic decays. The Ke3 and Kμ3 results are in good agreement allowing for a combined result which matches the precision of the current world average on the vector and scalar form factors. Recent study of the rare decay K^± → π^±γγ from the NA48/2 and NA62 data samples is also reported.

Rare kaon decays provide unique opportunity to test the Standard Model and probe its possible extensions. The primary goal of the NA62 experiment is the measurement of the decay with a precision of 10% in two years of data taking. The detector setup together with the analysis technique is described.