New results from the NA48/2 experiment at CERN SPS: radiative   nonleptonic kaon decays
  The NA48/2 experiment at the CERN SPS carried out data taking in 2003 and 2004. Analysis of the selected data samples of 7,146 $K^\pm\to\pi^\pm e^+e^-$ decay candidates with 0.6% background, 1,164 $K^\pm\to\pi^\pm\gamma\gamma$ candidates with 3.3% background, and 120 $K^\pm\to\pi^\pm\gamma e^+e^-$ candidates with 6.1% background allowed precise measurements of branching fractions and other characteristics of these rare kaon decays. 
Evgueni Goudzovski