Measurement of the FCNC decays K+- --> pi+- l+ l- by the NA48/2 experiment at CERN

A sample of 7253 $K^{\pm }\to {\pi }^{\pm }{e}^{+}{e}^{-}$ decay candidates with 1.0% background contamination has been collected by the NA48/2 experiment at the CERN SPS, which allowed a precise measurement of the form factor, the branching ratio, and the CP violating asymmetry of $K^{+}$ and $K^{-}$ decay widths was investigated. The results of the $K^{\pm }\to {\pi }^{\pm }{e}^{+}{e}^{-}$ analysis, as well as the status of the $K^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ analysis based in the same data set, are reported.