Abstract
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. 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(ϵ′/ϵ)=(13.7±3.1)×10−4. Combining this result with that published from the 1997, 98 and 99 data, an overall value of Re(ϵ′/ϵ)=(14.7±2.2)×10−4 is obtained from the NA48 experiment.
Highlights
CP violation was discovered 38 years ago in the decays of neutral kaons [1]
CP violation can occur via the mixing of CP eigenstates, called indirect CP violation, represented by the parameter
NA48 published a result of Re( / ) = (15.3 ± 2.6) × 10−4, using data collected in 1997 [7], 1998 and 99 [8], and KTeV presented a preliminary result of Re( / ) = (20.7 ± 2.8) × 10−4 [9] on data accumulated in 1996 [10] and 97
Summary
CP violation was discovered 38 years ago in the decays of neutral kaons [1]. Recently CP violation in the B0 mesons has been observed [2]; neutral kaons remain a privileged system for the study of the phenomenon. CP violation can occur in the decay process through the interference of amplitudes with different isospins. This is represented by the parameter and is called direct CP violation. NA48 published a result of Re( / ) = (15.3 ± 2.6) × 10−4, using data collected in 1997 [7], 1998 and 99 [8], and KTeV presented a preliminary result of Re( / ) = (20.7 ± 2.8) × 10−4 [9] on data accumulated in 1996 [10] and 97 These observations confirmed the existence of a direct CP-violation component. Details of the apparatus and of the data analysis can be found in [8], here only the differences with respect to the 1998–1999 data-taking will be stressed
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