Abstract
The quantity ϵ'/ϵ measures direct CP violation in Kaon decays. Recent analysis of this ratio resulted in a 2.9 sigma discrepancy between the Standard Model predictions and the experimental data. Our ability to observe or constrain New Physics depends on the accuracy of determining the SM “background”, hence a precise evaluation of ϵ'/ϵ is particularly important. We discuss the Standard Model prediction and the relevant matching calculations at NNLO for this observable.
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