Towards NNLO accuracy for ε'/ε

10th International Conference on Kaon Physics

Cerdà-Sevilla, M.^1 ; Gorbahn, M.^1 ; Jäger, S.^2 ; Kokulu, A.^1

Department of Mathematical Sciences, University of Liverpool, Liverpool

L69 7ZL, United Kingdom^1

Department of Physics and Astronomy, University of Sussex, Brighton

BN1 9QH, United Kingdom^2

关键词: Correct solution;    CP violations;    Distance effects;    Future prospects;    Non-perturbative effects;    Nonperturbative;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012008/pdf
DOI  :  10.1088/1742-6596/800/1/012008

来源: IOP

【 摘 要 】

The quantity ′/ 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 ′/ 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.