New Dipole Penguin Contribution to K → ππ decays

Eeg, Jan O. and Kumerički, Krešimir and Picek, Ivica (2008) New Dipole Penguin Contribution to K → ππ decays. Physics Letters B, 669. pp. 150-155. ISSN 0370-2693

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We point out that the standard chromomagnetic penguin dipole operator has a counterpart corresponding to off-shell momenta for external quarks. By employing the chiral quark model, we show that this new dipole penguin operator has the same bosonisation as the standard Q_6 operator. Accordingly, this new operator enlarges by ~ 5 % the referent Q_6 operator, which gives the dominant contribution to the CP-violating ratio epsilon'/epsilon and also gives an important contribution to the Delta I = 1/2 amplitude.

Item Type: Article
Keywords: K mesons; electroweak transitions; quark models; chiral lagrangians; CP violation
Date: 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: This article is available under the terms of the Creative Commons Attribution License (CC BY You may copy and distribute the article, create extracts, abstracts and new works from the article, alter and revise the article, text or data mine the article and otherwise reuse the article commercially (including reuse and/or resale of the article) without permission from Elsevier. You must give appropriate credit to the original work, together with a link to the formal publication through the relevant DOI and a link to the Creative Commons user license above. You must indicate if any changes are made but not in any way that suggests the licensor endorses you or your use of the work. Received 17 March 2008; Received in revised form 16 September; 2008; Accepted 19 September 2008; Available online 26 September 2008.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982930-1016
Publisher: Elsevier
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 01 May 2019 11:59
Last Modified: 01 May 2019 11:59

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