Abstract
The NA31 experiment has measured the CP violation parameter e’/e. The result of data collected in 1988 is Re(e’/e)=(1.7±1.0)×10−3. A preliminary result of data collected in 1989 is Re(e’/e)=(2.1±0.9)×10−3. Combining these two results with the original result from the 1986 data set we obtain Re(e’/e)=(2.3±0.7)×10−3, which is a more than three standard deviation evidence for direct CP violation. A new experiment NA48 is under construction which aims for a significant reduction of the statistical and the systematical errors in order to reach a combined error not exceeding 2×10−4.
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