Abstract
During the last ten years the measurement of direct CP violation in the K 0 — K 0 system has been vigorously carried out by expriments NA48 at CERN and KTeV at Fermilab. The measurement of the parameter Re(ε′/ε) has been achieved with an accuracy of 2 × 10 −4 . We review some important results obtained by these two experiments among which the clear evidence of direct CP violation. The CPLEAR contribution to the precision determination of parameters in the kaon sector is briefly discussed.
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