± Decays from NA 48 / 2

Abstract

New results on radiative K± decays from the NA48/2 experiment are presented. In the channel K± → π±π0γ more than 1 million decays were reconstructed, leading to the first measurement of the interference between direct photon emission and inner bremsstrahlung and stringent limits on CP violation in this decay. For K → πγγ , a precise measurement of the branching fraction was performed, based on more than 1000 events. In addition, the related decay K± → π±e+e−γ was observed for the first time and measurements of the decay rate and the decay parameter ĉ were carried out.

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