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 minimume+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 millionKe3and 2.3 millionKµ3events collected in 2004.
Highlights
The NA48/2 experiment at the CERN SPS was designed to search for direct CP violation in K± decays to three pions [1]
The detector and beam of the experiment are described in details in [1, 2]
Tracks of the charged particles from K± decays were measured by a magnetic spectrometer consisting of four drift chambers (DCH1–DCH4) and a dipole magnet located between the second and third chamber
Summary
The NA48/2 experiment at the CERN SPS was designed to search for direct CP violation in K± decays to three pions [1]. Reconstructed momenta of selected tracks are required to be in the range (3–50) GeV/c, and the total vertex momentum to be
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