89 research outputs found

    Update on εK\varepsilon_K with lattice QCD inputs

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    We report updated results for εK\varepsilon_K, the indirect CP violation parameter in neutral kaons, which is evaluated directly from the standard model with lattice QCD inputs. We use lattice QCD inputs to fix BˉK\bar{B}_K, ∣Vcb∣|V_{cb}|, ξ0\xi_0, ξ2\xi_2, ∣Vus∣|V_{us}|, and mc(mc)m_c(m_c). Since Lattice 2016, the UTfit group has updated the Wolfenstein parameters in the angle-only-fit method, and the HFLAV group has also updated ∣Vcb∣|V_{cb}|. Our results show that the evaluation of εK\varepsilon_K with exclusive ∣Vcb∣|V_{cb}| (lattice QCD inputs) has 4.0σ4.0\sigma tension with the experimental value, while that with inclusive ∣Vcb∣|V_{cb}| (heavy quark expansion based on OPE and QCD sum rules) shows no tension.Comment: 8 pages, 7 figures, Lattice 2017 proceeding, references update
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