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The NA48/2 experiment at the CERN SPS collected in 2003 and 2004 largesamples of the decays K+- -> pi+ pi- e+- nu (Ke4+-), K+- -> pi0 pi0 e+- nu(Ke400) and K+- -> pi0 pi0 pi+-. From the Ke4+- form factors and from the cuspin the M00^2 distribution of the K+- -> pi0 pi0 pi+- events, the pi-piscattering lengths a00 and a20 could be extracted. This measurement is afundamental test of Chiral Perturbation Theory (ChPT). The branching fractionand form factors of the Ke400 decay were precisely measured, using a muchlarger data sample than in previous experiments. An improved measurement of theslope parameters for the decay K+- -> pi0 pi0 pi+- showed evidence for anon-zero value of k.

Ke4 decays and Wigner cusp