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 −→qqℓ ν 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 Γ 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 s from 161 to 183 GeV, to obtain: M W=80.432±0.066 (stat.)±0.045 (syst.) GeV, Γ W=2.04±0.16 (stat.)±0.09 (syst.) GeV. The consistency of the direct measurement of M W with that inferred from other measurements of electroweak parameters provides an important test of the Standard Model of electroweak interactions.
Highlights
IntroductionThe LEP e+e− collider at CERN provides an ideal environment for the study of the properties of the gauge bosons of the Standard its operation, LEP produced e+e−
The LEP e+e− collider at CERN provides an ideal environment for the study of the properties of the gauge bosons of the Standard its operation, LEP produced e+e−cMololidseiol n(sSMat)coefnterlee-cotfr-omwaesaskeninetregriaecst,io√nss,[1]
Two possible sources of final state interactions, both leading to non-independent hadronisation, have been widely considered: Colour Reconnection (CR) and Bose-Einstein Correlations (BEC)
Summary
The LEP e+e− collider at CERN provides an ideal environment for the study of the properties of the gauge bosons of the Standard its operation, LEP produced e+e−. Since 1996, the LEP collider has operated above the threshold for W+W− production (LEP2), allowing measurements of the trilinear gauge boson couplings [4] and a direct measurement of MW. Comparison the value determined indirectly bfertowmeednattaheredciorredcetdmaeta√susre≈meMntZs of the mass of the W provides an important boson and test of the self-consistency of the Standard Model. This paper describes a measure√ment of the mass of the W boson using a further 183 pb−1 of data recorded by OPAL during 1998 at s∼ 189 GeV. This result is combined with previous OPAL measurements to give a direct measurement of the mass of the W boson with a total uncertainty of 79 MeV.
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