Search

Recent results on CP violation on kaons by the CERN NA48 experiment will be discussed. A preliminary measurement of the charge asymmetry in KL → π±e∓ν has been made: δLe = (3.317±0.070stat±0.072syst) × 10−3. A search for KS → 3π0 decays has been performed with a preliminary estimation of the real and imaginary part of the η000 parameter: Re(η000) = (−2.6±1.0stat±0.5syst) × 10−2 and Im(ηn000) = (−3.4±1.0tstat±1.1syst) × 10−2. The angular asymmetry in KL → π+π−e+e− has been measured to be AL = (14.2 ± 3.0stat ± 1.9syst)%, while no asymmetry has been observed in K → π+π−e+e−: AS = (0.5 ± 4.0stat ± 1.6syst)%. Finally, the direct CP violation in KnS,L → 2π has been clearly settled, with tRe(ε′/ε) = (14.7 ± 2.2) × 10−4. [Copyright &y& Elsevier]