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The largest data samples of semi-leptonic charged kaon deca ys in K+− e4 (K ± → π+π−e±νe) and K00 e4 (K ± → π0π0e±νe) modes have been collected by the NA48/2 experiment at CERN S PS. We report improved measurements of branching fractions and detailed form factors studies. The achieved remarkable precisions of the results bring new inp uts to low energy QCD description and crucial tests of predictions from Chiral Perturbation T heory.

Detailed study of the Ke4 decay mode properties