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Direct CP violation; neutral kaons

The final result of the NA48 experiment is presented and performed at the CERN SPS neutral kaon beams, on the direct CP violation parameter Re(ε′/ε), as measured from the decay rates of neutral kaons into two pions. The data collected in the years 1997–2001 yield the evidence for the direct CP violation with Re(ε′/ge) = (14.7±2.2) x 10⁻⁴. Description of experimental method and systematics, comparison with the corresponding FNAL result and discussion of some implications for the theory are given.

Wojciech Wiślicki¹

1. A. Soltan Institute for Nuclear Studies, Hoza 69, Warszawa - PL-00-681, Poland