The highlighted sentence reads: The presence of a two-pion decay mode implies that the K,° meson is not a pure eigenstate of CP.
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For a while, physicists thought CP — charge conjugation accompanied by a simultaneous parity transformation — would be a symmetry of the Weak Interaction. But that is violated as well.
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.13.138
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