Current status of ϵK calculated with lattice QCD inputs

Jon A. Bailey, Yong Chull Jang, Weonjong Lee

Research output: Contribution to journalConference articlepeer-review


We present results for ϵk, the indirect CP violation parameter, calculated in the Standard Model using inputs from lattice QCD: the kaon bag parameter Bk, and the CKM matrix element Vcb from the axial current form factor for the exclusive decay B → Dlv at zero-recoil. In addition, we take the coordinates of the unitarity triangle apex (p, η) from the angle-only fit of the UTfit Collaboration and use Vus to fix λ. In order to estimate the systematic error, we also use Wolfenstein parameters from the CKMfitter and UTfit. We find a 3.3(2)σ difference between ψk and experiment with exclusive Vcb. We report details of this preliminary result.

Original languageEnglish
Article number371
JournalProceedings of Science
VolumePart F130500
Publication statusPublished - 2014
Event32nd International Symposium on Lattice Field Theory, LATTICE 2014 - New York, United States
Duration: 2014 Jun 232014 Jun 28

Bibliographical note

Funding Information:
The research of W. Lee is supported by the Creative Research Initiatives Program (No. 2014001852) of the NRF grant funded by the Korean government (MEST). W. Lee would like to acknowledge the support from KISTI supercomputing center through the strategic support program for the supercomputing application research [No. KSC-2013-G2-005]. Computations were carried out on the DAVID GPU clusters at Seoul National University. J.A.B. is supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2014027937).

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of 'Current status of ϵK calculated with lattice QCD inputs'. Together they form a unique fingerprint.

Cite this