Abstract
NA48/2 results contributing to ChPT testing are presented. A sample of 1663 events of the rare decay
$ K^ \pm \to \mu ^ \pm ve^ + e^ - $
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
$ K^ \pm \to \mu ^ \pm ve^ + e^ - $
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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1 articles.
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