Observation of Hadronic $W$ Decays in $t \bar{t}$ Events with the Collider Detector at Fermilab

Publisher Website

29 June 1998

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 80 (26) , 5720-5725
https://doi.org/10.1103/physrevlett.80.5720

Abstract

We observe hadronic

W

decays in

t \bar{t} \to W (\to ℓ ν) + \geq 4

jet events using a

109 {pb}^{- 1}

data sample of

p \bar{p}

collisions at

\sqrt{s} = 1.8 TeV

collected with the Collider Detector at Fermilab. A peak in the dijet invariant mass distribution is obtained that is consistent with

W

decay and inconsistent with the background prediction by

3.3 σ

. From this peak we measure the

W

mass to be

77.2 \pm 4.6 (stat + syst) GeV {/ c}^{2}

. This result demonstrates the presence of a second

W

boson in

t \bar{t}

candidates in the

W (\to ℓ ν) + \geq 4

jet channel.

Keywords

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