The phase φ+− of CP violation in the K0 → π+π− decay |
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Authors: | S Gjesdal G Presser P Steffen J Steinberger F Vannucci H Wahl F Eisele H Filthuth V Lüth G Zech K Kleinknecht |
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Institution: | CERN, Geneva, Switzerland;Institut für Hochenergiephysik, Heidelberg, Germany;Universität Dortmund, Dortmund, Germany |
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Abstract: | The phase φ+? is evaluated on the basis of measurements of the KS-KL interference in the π+π? decay mode and the mass difference Δm, both reported previously by this group. The result is: φ+? = 45.9° ± 1.6°. This, together with previous results on and the charge asymmetry δ in leptonic decay, is compared with the prediction of the superweak model, with good agreement.Finally the result is used to find, on the basis of unitarity, a new upper limit on CP violation in the decay K0 → 3π0. This limit is |η000|2? 0.21. |
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