A measurement of the ratio of the CP-nonconservation parameters, ε′ε, in the K0K̄0 system was performed through a study of two-pion decays with and without a regenerator. To reduce systematic effects, KL and KS decays were recorded simultaneously with a double beam. Over 3100 KL→2π0 events were reconstructed leading to the result ε′ε=-0.0046±0.0053±0.0024 (the first error is statistical, the second systematic). The measurement agrees with previous less precise determinations but, because of theoretical uncertainties, is not able to test decisively the Kobayashi-Maskawa mechanism.
ASJC Scopus subject areas
- Physics and Astronomy(all)