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The direct CP violation parameter Re(ε ′ /ε) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. With 3.3 million KL → π 0 π 0 events collected during the 1998 and 1999 running periods, a result of Re(ε ′ /ε) = (15.0 ± 2.7)×10 −4 has been obtained. The result combined with the published 1997 sample(More)
The direct CP violation parameter Re((//) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. The 2001 running period was devoted to collecting additional data under varied conditions compared to earlier years (1997–1999). The new data yield the result: Re((//) = (13.7 ± 3.1) × 10 −4. Combining(More)
The phases of the CP-violating amplitudes in K°-*~+~-and K°~2n ° decays, ¢~+ _ =46.9 ° + 2.2: and 000=47.1 ° + 2.8% have been measured in the same experiment, and a direct comparison gives the phase difference ¢co-0+-=0.2 ° + 2.9 °. This result leads to an upper limit on possible CPT violation in the K ° mass matrix, of I (mR~-mKo)/m~:o I < 5 × I 0-~8 at(More)
A value of (−6.1 ± 0.9 stat ± 0.5 syst) × 10 −3 is obtained for the quadratic slope parameter h in the K L → 3π 0 decay Dalitz plot at the NA48 experiment at the CERN SPS. The result is based on 14.7 × 10 6 fully reconstructed K L → 3π 0 → 6γ decays. This is the most precise measurement of any of the Dalitz plot slope parameters in the charged and neutral(More)
The weak hadronic decay Do + KOK+K-is observed in a data sample of 9.3 pb-' collected with the Mark III detector at the $~(3770) resonance. An analysis of the K+K-subsystem suggests that while the decay proceeds in part through the iir " b channel, providing evidence for the presence of non-spectator amplitudes in Do decays, a significant fraction of the(More)