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Observation of Direct<i>CP</i>Violation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">S</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="italic">L</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mspace /><mml:mo>→</mml:mo><mml:mspace /><mml:mi mathvariant="italic">π</mml:mi><mml:mi mathvariant="italic">π</mml:mi></mml:math>Decays
We have compared the decay rates of KL and KS to π+π− and π0π0 final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-CP-violation parameter Re(ε′/ε) is equal to [28.0±3.0(stat)±2.8(syst)]×10−4. This result definitively establishes the existence of CP violation in …