Speaker
Description
The electroweak model operates with only a few fundamental parameters. Extracting them from high-precision measurements in various systems and at different kinematics requires computing quantum corrections (both universal and process-specific) to leading-order SM predictions with an adequate precision. Recent advances in computing process-specific electroweak box corrections led to establishing a 3$\sigma$ deficit in the unitarity of the Cabibbo-Kobayashi-Maskawa mixing matrix in the top row, $|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=0.9985(5)$, which may be a hint to BSM physics. Electroweak boxes depend on fine details of strong interaction and hadronic structure, and are sensitive to a wide range of energy scales. Modern calculations combine theory inputs valid at each scale (perturbative and lattice QCD, dispersion relations and nuclear models), together with experimental measurements. I will give an overview of recent developments and open questions.
