Two-loop Electroweak Corrections to the Top-Quark Contribution to ${\epsilon }_K$

Joachim Brod, Sandra Kvedaraitė, Zachary Polonsky

The parameter ${\epsilon }_K$ 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-Kobabyash…