Precision Electroweak Measurements and Constraints on the Standard Model

TL;DR

This paper consolidates precision electroweak measurements from LEP, SLC, and other experiments to refine Standard Model parameters, compare results, and predict outcomes for low-$Q^2$ experiments, updating previous constraints with new data on W boson width and top quark mass.

Contribution

It provides updated constraints on Standard Model parameters using combined high-$Q^2$ electroweak data, improving the precision of theoretical predictions and experimental consistency.

Findings

Refined constraints on Standard Model parameters.

Updated measurements of W boson width and top quark mass.

Predictions for low-$Q^2$ experiments based on combined data.

Abstract

This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results obtained at the electron-positron colliders LEP and SLC. The results are compared with precise electroweak measurements from other experiments, notably CDF and D\O\ at the Tevatron. Constraints on the input parameters of the Standard Model are derived from the combined set of results obtained in high-$Q^2$ interactions, and used to predict results in low-$Q^2$ experiments, such as atomic parity violation, M{\o}ller scattering, and neutrino-nucleon scattering. The main changes with respect to the experimental results presented in 2009 are new combinations of results on the width of the W boson and the mass of the top quark.