Speaker
María Cerdá-Sevilla
(Technical University of Munich)
Description
The quantity $\varepsilon^\prime/\epsilon$ measures direct CP violation in Kaon decays. SM predictions show a 2.9$\sigma$ 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 $\varepsilon^\prime/\varepsilon$ and discuss future prospects, as well as issues of scheme dependence and the separation of perturbative and nonperturbative effects.
