# Measurement of the W boson Mass and Width in $e^{+}e^{-}$ Collisions at LEP

Abstract : The mass of the W boson is determined from the direct reconstruction of its decays into purely hadronic and semi-leptonic events in e+e- collisions at LEP. The data sample corresponds to an integrated luminosity of 683 inverse picobarns collected with the ALEPH detector at centre-of-mass energies up to 209 GeV. To minimise any effect from colour reconnection a new procedure is adopted in which low energy particles are not considered in the mass determination from the purely hadronic channel. The combined result from all channels is Mw = 80.440+-0.043(stat.)+-0.024(syst.)+-0.009(FSI)+-0.009(LEP) GeV/c**2 where FSI represents the possible effects of final state interactions in the purely hadronic channel. From two-parameter fits to the W mass and width, the W width is found to be Gw = 2.14+-0.09(stat.)+-0.04(syst.)+-0.05(FSI)+-0.01(LEP) GeV
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00085116
Contributor : Sabine Starita <>
Submitted on : Tuesday, July 11, 2006 - 5:10:47 PM
Last modification on : Tuesday, June 30, 2020 - 10:00:47 AM

### Citation

S. Schael, R. Barate, R. Brunelière, I. de Bonis, D. Decamp, et al.. Measurement of the W boson Mass and Width in $e^{+}e^{-}$ Collisions at LEP. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2006, 47, pp.309-335. ⟨10.1140/epjc/s2006-02576-8⟩. ⟨in2p3-00085116⟩

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