Search

New high-luminosity e+e- colliders have been proposed to perform precision measurements of electroweak and Higgs physics to scrutinize the mechanism of electroweak symmetry breaking and search for signs of new physics. The interpretation of the data from such a machine is only possible with the help of accurate theoretical calculations of the Standard Model expectations, including higher-order radiative corrections. This contribution provides an overview of the current knowledge and required improvements for our theoretical understanding of a range of key observables. Furthermore, it gives a short summary of the calculational techniques that can be leveraged to realize these improvements. [ABSTRACT FROM AUTHOR]

Precision measurements of properties of the electroweak W- and Z-bosons provide strong constraints on the Standard Model (SM) and extensions thereof. This sensitivity crucially depends on the availability of accurate theoretical predictions for these quantities, including higher-order radiative corrections. This contribution gives a brief overview of available calculations and compares the estimate of theory uncertainties with the projected experimental precision of future e+e− collider proposals. Then it is shown how numerical Mellin–Barnes integrals can be used to evaluate higher-order loop integrals that depend on three or more independent mass and momentum scales. As a concrete physical application, the complete two-loop corrections to Z → bb̅ are considered. [ABSTRACT FROM AUTHOR]