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Measurement of the $W$ boson mass and width in $e^+ e^-$ collisions at LEP

Schael, S. and Bouhova-Thacker, Evelina and Bowdery, Christopher and Clarke, David and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger and Sloan, Terence and Smizanska, Maria (2006) Measurement of the $W$ boson mass and width in $e^+ e^-$ collisions at LEP. European Physical Journal C: Particles and Fields, 47 (2). pp. 309-335. ISSN 1434-6044

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Abstract

The mass of the W boson is determined from the direct reconstruction of W decays in WW→qq̄qq̄ and WW→ℓνqq̄ events in e+e- collisions at LEP. The data sample corresponds to an integrated luminosity of 683 pb-1 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 qq̄qq̄ channel. The combined result from all channels is mW=80.440±0.043(stat.)±0.024(syst.)±0.009(FSI)±0.009(LEP)GeV/c2, where FSI represents the possible effects of final state interactions in the qq̄qq̄ channel and LEP indicates the uncertainty in the beam energy. From two-parameter fits to the W mass and width, the W width is found to be ΓW=2.14±0.09(stat.)±0.04(syst.)±0.05(FSI)±0.01(LEP)GeV.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Additional Information: Jones undertook extensive studies of potential colour reconnection in the fully hadronic channels, and so constrained imortant systematic uncertainty contributions, using multiplicities and particle flows. The measurement gives one of the most precise determinations of the electroweak coupling strength. RAE_import_type : Journal article RAE_uoa_type : Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2309
Deposited By: ep_importer
Deposited On: 03 Apr 2008 16:23
Refereed?: Yes
Published?: Published
Last Modified: 15 Feb 2014 00:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2309

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