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.
|Journal||Proceedings of Science|
|Publication status||Published - 2016|
|Event||34th Annual International Symposium on Lattice Field Theory, LATTICE 2016 - Southampton, United Kingdom|
Duration: 2016 Jul 24 → 2016 Jul 30
Bibliographical noteFunding 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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