Speaker
Dr
Sandra Kvedaraite
(University of Cincinnati)
Description
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-Kobabyashi-Maskawa matrix. The
perturbative theory uncertainty is currently dominated by the
top-quark contribution. In this talk I will present the calculation of the full
two-loop electroweak corrections to the top-quark contribution to
$\epsilon_K$, including the resummation of QED-QCD logarithms. I will also
discuss different renormalization prescriptions for the electroweak
input parameters. In the traditional normalization of the weak
Hamiltonian with two powers of the Fermi constant $G_F$, the top-quark
contribution is shifted by $-1\%$.
Authors
Joachim Brod
(University of Cincinnati)
Zach Polonsky
(University of Cincinnati)
Dr
Sandra Kvedaraite
(University of Cincinnati)
