PIKIMO 11

Two-loop Electroweak Corrections to the Top-Quark Contribution to ϵK

4 Dec 2021, 10:15

15m

Speaker

Dr Sandra Kvedaraite (University of Cincinnati)

Description

The parameter ${ϵ}_K$ 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
${ϵ}_K$, 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 $-1\mathrm{\%}$.

Presentation materials

PIKIMO 11.pdf