A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model

TL;DR

This paper combines and updates electroweak measurements from LEP and SLD experiments, compares them with other experimental results, and evaluates Standard Model parameters to test its consistency.

Contribution

It provides a comprehensive combination of electroweak results and constraints on the Standard Model using data from multiple experiments and recent updates.

Findings

Updated W branching fractions and four-fermion cross sections

Consistent electroweak measurements with Standard Model predictions

Constraints on Standard Model parameters from combined data

Abstract

This note presents a combination of published and preliminary electroweak results from the four LEP collaborations and the SLD collaboration which were prepared for the 2004 summer conferences. [...] The main changes with respect to the experimental results presented in summer 2003 are updates to the W branching fractions and four-fermion cross sections measured at LEP-2, and the SLD/LEP heavy-flavour results measured at the Z pole. The results are compared with precise electroweak measurements from other experiments, notably the final result on the electroweak mixing angle determined in neutrino-nucleon scattering by the NuTeV collaboration, the latest result in atomic parity violation in Caesium, and the measurement of the electroweak mixing angle in Moller scattering. The parameters of the Standard Model are evaluated, first using the combined LEP electroweak measurements, and then using the full set of high-$Q^2$ electroweak results.