2018 Update on εK with lattice QCD inputs

Jon A. Bailey, Sunkyu Lee, Weonjong Lee, Yong Chull Jang, Jaehoon Leem, Sungwoo Park

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We present updated results for εK determined directly from the standard model (SM) with lattice QCD inputs such as BK, |Vcb|, |Vus|, ξ0, ξ2, ξLD, FK, and mc. We find that the standard model with exclusive |Vcb| and other lattice QCD inputs describes only 70% of the experimental value of |εK| and does not explain its remaining 30%, which leads to a strong tension in |εK| at the 4σ level between the SM theory and experiment. We also find that this tension disappears when we use the inclusive value of |Vcb| obtained using the heavy quark expansion based on QCD sum rules.

Original languageEnglish
Article number284
JournalProceedings of Science
Publication statusPublished - 2018
Event36th Annual International Symposium on Lattice Field Theory, LATTICE 2018 - East Lansing, United States
Duration: 2018 Jul 222018 Jul 28

Bibliographical note

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of '2018 Update on εK with lattice QCD inputs'. Together they form a unique fingerprint.

Cite this