Status report on ϵk with lattice QCD inputs

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

Research output: Contribution to journalConference articlepeer-review


We report the current status of ϵK, the indirect CP violation parameter in the neutral kaon system, evaluated using the lattice QCD inputs. We use lattice QCD to fix BK, ξ0, ξ2, |Vus|, mc(mc), and |Vcb|. Since Lattice 2015, FLAG updated BK, exclusive Vcb has been updated with new lattice data in the B →Dℓν decay channel, and RBC-UKQCD has updated ξ0 and ξ2. Our preliminary results show that the standard model evaluation of ϵK with exclusive |Vcb| (lattice QCD inputs) has 3:2σ tension with the experimental value, while that of ϵK with inclusive jVcbj (heavy quark expansion) shows no tension.

Original languageEnglish
JournalProceedings of Science
VolumePart F128557
Publication statusPublished - 2016
Event34th Annual International Symposium on Lattice Field Theory, LATTICE 2016 - Southampton, United Kingdom
Duration: 2016 Jul 242016 Jul 30

Bibliographical note

Funding Information:
We thank R. Van de Water for helpful discussion on Vcb. The research of W. Lee is supported by the Creative Research Initiatives Program (No. 20160004939) of the NRF grant funded by the Korean government (MEST). 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. 2015024974). W. Lee would like to acknowledge the support from the KISTI supercomputing center through the strategic support program for the supercomputing application research(No. KSC-2014-G3-003). Computations were carried out on the DAVID GPU clusters at Seoul National University.

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All Science Journal Classification (ASJC) codes

  • General


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