We report updated results for εK, the indirect CP violation parameter in neutral kaons, which is evaluated directly from the standard model with lattice QCD inputs. We use lattice QCD inputs to fix BˉK, ∣Vcb∣, ξ0, ξ2, ∣Vus∣, and mc(mc). Since Lattice 2016, the UTfit group has updated the Wolfenstein parameters in the angle-only-fit method, and the HFLAV group has also updated ∣Vcb∣. Our results show that the evaluation of εK with exclusive ∣Vcb∣ (lattice QCD inputs) has 4.0σ tension with the experimental value, while that with inclusive ∣Vcb∣ (heavy quark expansion based on OPE and QCD sum rules) shows no tension.
@article{arxiv.1710.06614,
title = {Update on $\varepsilon_K$ with lattice QCD inputs},
author = {Yong-Chull Jang and Weonjong Lee and Sunkyu Lee and Jaehoon Leem},
journal= {arXiv preprint arXiv:1710.06614},
year = {2018}
}