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Abstract
The quantity ε′/ε measures direct CP violation in Kaon decays. Recent SM predictions show a 2.9σ tension with data, with the theoretical uncertainty dominating. As rapid progress on the lattice is bringing nonperturbative long-distance effects under control, a more precise knowledge of short-distance contributions is needed. We describe the first NNLO results for ε′/ε and discuss future prospects, as well as issues of scheme dependence and the separation of perturbative and nonperturbative effects. Finally we also comment on the solution of the renormalisation-group evolution in one of the talks at this conference and present the correct solution.
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Details
1 Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, UK
2 Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, UK