Status and Prospect of ε'/ε from a Lattice perspective

10th International Conference on Kaon Physics

Garron, Nicolas^1

Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool

L69 7ZL, United Kingdom^1

关键词: Continuum limits;    CP-violation parameters;    Lattice QCD;    Lattice spacing;    Matrix elements;    Status and prospect;    Stringent constraints;    The standard model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/800/1/012003/pdf
DOI  :  10.1088/1742-6596/800/1/012003

来源: IOP

【 摘 要 】

An ab-initio determination of the hadronic matrix elements relevant for a theoretical determination of K → ππ decays has been a goal for the lattice QCD community for about three decades. These matrix elements are key to the theoretical determination of the CP violation parametersand ′. This is not only relevant to challenge the Standard Model but also to provide stringent constraints on New-Physics scenarios. Although such a computation is very challenging, impressive results have been reported over the last few years. The most spectacular is the first realistic computation of ′/ with physical kinematics by RBC-UKQCD [1]. The novelty is the ΔI →1/2 channel, whereas the ΔI →3/2 contribution is now computed at several values of the lattice spacing and extrapolated to the continuum limit. After a short overview, I will report on the status and the prospect of direct and indirect violation in kaon decays from a lattice perspective.