Measurement of the Mass and the Width of the W Boson at LEP
L3 Collaboration
TL;DR
This paper reports precise measurements of the W boson's mass and decay width using data from the LEP collider, contributing to tests of the Standard Model.
Contribution
It provides the first combined measurement of W boson mass and width at LEP with improved precision over previous results.
Findings
W boson mass measured as 80.270 GeV
W boson width measured as 2.18 GeV
Results agree with Standard Model predictions
Abstract
The mass and the total decay width of the W boson are measured with the L3 detector at the LEP e+e- collider using W-boson pairs produced in 0.7/fb of data collected at centre-of-mass energies between 161 and 209GeV. Combining semi-leptonic and fully-hadronic final states, the mass and the width of the W boson are determined to be mW = 80.270 +/- 0.046 +/- 0.031 GeV and GW = 2.18 +/- 0.11 +/- 0.09 GeV, where the first uncertainty is statistical and the second systematic.
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