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 → D∗lv 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.
|Journal||Proceedings of Science|
|Publication status||Published - 2014|
|Event||32nd International Symposium on Lattice Field Theory, LATTICE 2014 - New York, United States|
Duration: 2014 Jun 23 → 2014 Jun 28
Bibliographical noteFunding 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).
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