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Abstract
NA48/2 results contributing to ChPT testing are presented. A sample of 1663 events of the rare decay has been selected with a minimum e +e −effective mass of 140 MeV. The measured model independent decay rate is in agreement with ChPT predictions. The branching ratio of the decay, never observed so far, has been obtained from a sample of about 5000 candidates with less than 6% background, also in agreement with ChPT predictions. In addition, a most precise measurement of the charged kaon semileptonic formfactors has been obtained from 4.4 million Ke3 and 2.3 million Kµ3 events collected in 2004.
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