2015/03/23 by Jon A. Bailey, Bailey, Jon A., Yong-Chull Jang +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #hep-lat #hep-ph
paper · pdf · doi:10.48550/arxiv.1503.06613
5 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1503.05388
arxiv created 2015/04/11 · arxiv updated 2015/04/14
We present the Standard Model evaluation of the indirect CP violation parameter εK using inputs determined from lattice QCD together with experiment: |Vus|, |Vcb|, ξ0, and BK. We use the Wolfenstein parametrization (|Vcb|, λ, ρ, η) for the CKM matrix elements. For the central value, we take the angle-only fit of the UTfit collaboration, and use |Vus| from the Kℓ 3 and Kμ2 decays as an independent input to fix λ. For the error estimate, we use results of the global unitarity triangle fits from the CKMfitter and UTfit collaborations. We find that the Standard Model (SM) prediction of εK with exclusive Vcb (lattice QCD results) is lower than the experimental value by 3.6(2)σ. However, with inclusive Vcb (results of the heavy quark expansion), the tension between the SM prediction of εK and its experimental value disappears.