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Semileptonic kaon decays offer the most precise determination of the CKM matrix element |Vus|. The experimental precision is however limited by the knowledge of the form factors of these decays. The NA48/2 experiment presents high precision preliminary measurements of the form factors of the semileptonic decays of charged kaons (K±→ π0l±ν), based on 4.3 million Ke3 and 2.5 million Kμ3 decays, both with negligible background. At the same time a large sample of more than a million charged kaon decays to Ke4 final state (for both charged, K± → π+π−e±ν , and neutral, K± → π0π0e±ν , mode) has been collected, allowing a detailed study of ππ scattering and hadronic form factors. Here we present a much improved determination of the Branching Fraction for both charged and neutral modes and Form Factor for the charged mode.

Kaon Physics at CERN: recent results from the NA48/2 experiment