Abstract

Since the discovery of CP violation through the observation of decays of longlived neutral kaons into two pions a number of experiments have been performed to reveal its origin. Precision measurements in the neutral kaon system are discussed and compared to the effects expected in the Standard Model. The basic parameters in the phenomenology of CP violation have been determined from the decay amplitudes into two pions and from the semileptonic charge asymmetry as follows: $$\begin{gathered}\left| {\eta _{ + - } } \right| = (2.28 \pm 0.02) \times 10^{ - 3} \hfill \\\left| {\eta _{00} /\eta _{ + - } } \right|^2 = 0.991 \pm 0.003 \hfill \\\Phi _{ + - } = 43.7^ \circ \pm 0.6^ \circ \hfill \\\Phi _{00} = 43.5^ \circ \pm 1.0^ \circ \hfill \\\operatorname{Re} \varepsilon = (1.65 \pm 0.06) \times 10^{ - 3} \hfill \\\end{gathered} $$

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