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

G Abbiendi, Shaun Ashby, Ian Bloodworth, Paul Bright-Thomas, David Charlton, Christopher Hawkes, Roger Homer, Predrag Jovanovic, Alun Lloyd, Thomas McMahon, Stephen O'Neale, Scott Talbot, Miriam Watson, Peter Watkins, Alan Watson, Nigel Watson, John Wilson

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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 roots = 189 GeV with the OPAL detector, The invariant mass distributions from 970 W+W- --> qqqq and 1118 W+W- --> qq(l)v(l) candidate events are used to measure the mass of the W boson, M-W = 80.451 +/- 0.076 (stat.) +/- 0.049 (syst.) GeV, A direct measurement of the width of the W boson gives Gamma (W) = 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 roots from 161 to 183 GeV, to obtain: M-W = 80.432 +/- 0.066 (stat,) +/- 0.035 (syst,) GeV, Gamma (W) = 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. (C) 2001 Elsevier Science B,V, All rights reserved.
Original languageEnglish
Pages (from-to)29-46
Number of pages18
JournalPhysics Letters B
Issue number1-4
Publication statusPublished - 17 May 2001


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