Eur. Phys. J. C (2006) 45: 569-587
https://doi.org/10.1140/epjc/s2005-02459-6

Experimental Physics

Measurement of the mass and the width of the W boson at LEP

Received: 23 September 2005
Revised: 23 November 2005
Published online: 9 February 2006

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^–1 of data collected at centre-of-mass energies between 161 and 209 GeV. Combining semi-leptonic and fully-hadronic final states, the mass and the width of the W boson are determined to be where the first uncertainty is statistical and the second systematic.