Observation of Hadronic W Decays in t-tbar Events with the Collider Detector at Fermilab

Details Observation of Hadronic W Decays in t-tbar Events with the Collider Detector at Fermilab Observation of Hadronic W Decays in t-tbar Events with the Collider Detector at Fermilab

1997-11-11

arxiv.org/abs/hep-ex/9711004v2

Phys.Rev.Lett.80:5720-5725,1998

Physics

High Energy Physics

High Energy Physics - Experiment

20 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.80.5720

We observe hadronic W decays in t-tbar -> W (-> l nu) + >= 4 jet events using a 109 pb-1 data sample of p-pbar collisions at sqrt{s} = 1.8 TeV collected with the Collider Detector at Fermilab (CDF). 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 standard deviations. From this peak we measure the W mass to be 77.2 +- 4.6 (stat+syst) GeV/c^2. This result demonstrates the presence of two W bosons in t-tbar candidates in the W (-> l nu) + >= 4 jet channel.

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