Measurement of Mw from LEP2

TL;DR

This paper reports a precise measurement of the W boson mass (Mw) using data from LEP2 at 183 GeV, combining multiple energy points and accounting for various uncertainties to improve the accuracy of the Standard Model parameters.

Contribution

The paper presents a new combined measurement of Mw from LEP2 data, including systematic uncertainties, providing a more precise value for the W boson mass.

Findings

Mw = 80.35 GeV with combined uncertainties

Data from LEP2 at 183 GeV used for measurement

Results consistent with Standard Model predictions

Abstract

In 1997 each LEP experiment collected approximately 55 inv. pb of data at a center-of-mass energy of 183 GeV. These data yield a sample of candidate e+e- -> WW events from which the mass of the W boson, Mw, is measured. The LEP combined result, including data taken at roots = 161 and 172 GeV and assuming the Standard Model relation between the W decay width and mass, is Mw = 80.35 +/- 0.07 (exp) +/- 0.04 (CR) +/- 0.03 (E_beam) GeV, where the errors correspond to experimental, colour-reconnection/Bose-Einstein, and LEP beam energy uncertainties respectively.