Constraints on penguins from hadronic sum rules

We have derived an upper bound on the K-π transition amplitude of the penguin operator using hadronic sum rules. Combined with an anomalous-commutator contribution, this sets lower and upper limits on the physical K → 2π amplitude of the penguin operator. Applying this result to CP-violating effects...

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Bibliographic Details
Published in:Physics letters. B 1985-01, Vol.150 (4), p.311-316
Main Authors: Bilić, Neven, Guberina, Branko
Format: Article
Language:English
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Summary:We have derived an upper bound on the K-π transition amplitude of the penguin operator using hadronic sum rules. Combined with an anomalous-commutator contribution, this sets lower and upper limits on the physical K → 2π amplitude of the penguin operator. Applying this result to CP-violating effects, we find that the Gilman-Hagelin lower limit on ϵ′/ϵ decreases by an order of magnitude.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(85)91017-2