Recent QCD-related Results from Kaon Physics at CERN (NA48/2 and NA62)

The NA48/2 experiment presents a preliminary result of K ± l decays form factors measurement based on the 4 . 28 × 10 6 K ± e 3 and 2 . 91 × 10 6 K ± μ 3 selected decays collected in 2004. The result is competetive with other measurements in K ± μ 3 mode and has a smallest uncertainty for K ± e 3 , that leads to the most precise combined K ± l 3 result and allows to reduce the form factor uncertainty of | V US | . The NA62 experiment collected a large sample of charged kaon decays with a highly efficient trigger for decays into elec- trons in 2007. A final result of a new measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like momentum region from the 1 . 11 × 10 6 fully reconstructed π 0 Dalitz decays is presented in the second part of this article