Final state interactions in $$K\rightarrow \pi \pi $$ K → π π decays: $$\Delta I=1/2$$ Δ I = 1 / 2 rule vs. $$\varepsilon '/\varepsilon $$ ε ′ / ε
نویسندگان
چکیده
منابع مشابه
FINAL STATE INTERACTIONS IN ε ′ /ε a
Strong final state interaction (FSI) effects can play a central role in the Standard Model prediction of weak K → 2π matrix elements. Here, I discuss how FSI's affect the direct CP violation parameter ε ′ /ε by solving the Omnès problem for the necessary K → 2π amplitudes. The main results of this analysis have been reported in a previous paper 1 and are further discussed in Refs. 2,3. The resu...
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We present the next-to-leading order full results in Chiral Perturbation Theory for the charged Kaon K → 3π slope g CP violating asymmetries. We discuss the constraints that a measurement of these asymmetries would impose on the Standard Model results of ε K and search for new physics. We also study the kind of information that such measurement can provide on Im G8, Im (e GE) and higher order w...
متن کاملFinal State Interactions and Ε
I discuss the rôle of strong final state interactions (FSI) in K → 2π decays. In this case strong FSI effects can be resummed [1,2] by solving the Omnès problem for K → 2π amplitudes. Implications for the CP conserving ∆I = 1/2 ratio and the direct CP violation parameter ε ′ /ε are also discussed.
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The CP–violating ratio ε/ε constitutes a fundamental test for our understanding of flavour–changing phenomena. The present experimental world average,1 Re (ε/ε) = (19.3 ± 2.4) · 10, provides clear evidence for a non-zero value and, therefore, the existence of direct CP violation. The theoretical prediction has been rather controversial since different groups, using different models or approxima...
متن کاملThe ∆i = 1/2 Rule and Ε ′ /ε
The ∆I = 1/2 rule and direct CP violation ε ′ /ε in kaon decays are studied within the framework of the effective Hamiltonian approach in conjunction with generalized factorization for hadronic matrix elements. Conventionally the K → ππ matrix elements are evaluated under the factorization assumption so that O(µ) is factorized into the product of two matrix elements of single currents, governed...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2017
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-016-4586-7