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Determination of the Width of the Top Quark
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2011 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 106, no 2, 022001- p.Article in journal (Refereed) Published
Abstract [en]

We extract the total width of the top quark, Gamma(t), from the partial decay width Gamma(t -> Wb) measured using the t-channel cross section for single top-quark production and from the branching fraction B(t -> Wb) measured in t (t) over bar t events using up to 2.3 fb(-1) of integrated luminosity collected by the D0 Collaboration at the Tevatron p (p) over bar Collider. The result is Gamma(t) = 1.99(-0.55)(+0.69) GeV, which translates to a top-quark lifetime of tau(t) = (3.3-(+1.3)(0.9)) x 10(-25) s. Assuming a high mass fourth generation b' quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on vertical bar V-tb'vertical bar < 0.63 at 95% C.L.

Place, publisher, year, edition, pages
2011. Vol. 106, no 2, 022001- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-147774DOI: 10.1103/PhysRevLett.106.022001ISI: 000286746300004OAI: oai:DiVA.org:uu-147774DiVA: diva2:400983
Available from: 2011-03-01 Created: 2011-02-28 Last updated: 2013-03-01Bibliographically approved

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