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Measurement of the mass and width of the W boson in e+e− collisions at 189 GeV

Bailey, Ian Richard and Kartvelishvili, Vakhtang (2001) Measurement of the mass and width of the W boson in e+e− collisions at 189 GeV. Physics Letters B, 507 (1-4). pp. 29-46. ISSN 0370-2693

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Abstract

The mass and width of the W boson are determined in e+e− collisions at LEP using 183 pb−1 of data recorded at a centre-of-mass energy √s = 189 GeV with the OPAL detector. The invariant mass distributions from 970 W+W−→qqqq and 1118 W+W−→qqℓνℓ candidate events are used to measure the mass of the W boson, MW=80.451±0.076 (stat.)±0.049 (syst.) GeV. A direct measurement of the width of the W boson gives ΓW=2.09±0.18 (stat.)±0.09 (syst.) GeV. The results are combined with previous OPAL results from 78 pb−1 of data recorded with √s from 161 to 183 GeV, to obtain: MW=80.432±0.066 (stat.)±0.045 (syst.) GeV, ΓW=2.04±0.16 (stat.)±0.09 (syst.) GeV. The consistency of the direct measurement of MW with that inferred from other measurements of electroweak parameters provides an important test of the Standard Model of electroweak interactions.

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 82926
Deposited By: ep_importer_pure
Deposited On: 16 Nov 2016 10:08
Refereed?: Yes
Published?: Published
Last Modified: 21 Sep 2017 01:51
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/82926

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