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 HAL : in2p3-00005329, version 1
 European Physical Journal C 17 (2000) 241-261
 Measurement of the W Mass and Width in $e^+ e^-$ Collisions at 189 GeV
 ALEPH Collaboration(s)
 (2000)
 The mass of the W boson is determined in e+e- collisions at LEP by the direct reconstruction of W decays in WW->qqqq and WW->lvqq events, supplemented by measurements using the kinematic properties of the leptons in the WW->lvlv decay channel. The main sample of W pairs is selected from an integrated luminosity of 174 pb^-1 collected with the ALEPH detector in 1998 at a centre-of-mass energy of 188.63 GeV.The combined result from all channels is mW = 80.432+-0.072(stat.)+-0.041(syst.)+-0.019(FSI)+-0.017(LEP) GeV/c^2, where FSI represents the possible effects of final state interactions in the qqqq channel. In a second two-parameter fit to the qqqq, evqq and mvqq channels, where the W mass and width are decoupled, the average W width is found to be 2.24+-0.20(stat.)+-0.13(syst.) GeV/c^2, consistent with the Standard Model prediction. The combination of the mass measurement presented in this paper together with those derived previously from the W pair cross section at 161 and 172 GeV and direct reconstruction at 172 and 183 GeV gives mW = 80.418+-0.061(stat.)+-0.038(syst.)+-0.019(FSI)+-0.017(LEP) GeV
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
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 in2p3-00005329, version 1 http://hal.in2p3.fr/in2p3-00005329 oai:hal.in2p3.fr:in2p3-00005329 Contributeur : Nicole Berger <> Soumis le : Jeudi 16 Novembre 2000, 15:22:00 Dernière modification le : Jeudi 16 Novembre 2000, 15:22:00