Abstract
The parameter ϵK measures CP violation in the neutral kaon system. It is a sensitive probe of new physics and plays a prominent role in the global fit of the Cabibbo-Kobabyashi-Maskawa matrix. The perturbative theory uncertainty is currently dominated by the top-quark contribution. Here, we present the calculation of the full two-loop electroweak corrections to the top-quark contribution to ϵK, including the resummation of QED-QCD logarithms. We discuss different renormalization prescriptions for the electroweak input parameters. In the traditional normalization of the weak Hamiltonian with two powers of the Fermi constant GF, the top-quark contribution is shifted by −1%.
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Brod, J., Kvedaraitė, S. & Polonsky, Z. Two-loop electroweak corrections to the Top-Quark Contribution to ϵK. J. High Energ. Phys. 2021, 198 (2021). https://doi.org/10.1007/JHEP12(2021)198
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DOI: https://doi.org/10.1007/JHEP12(2021)198