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Determination of the Width of the Top Quark
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
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, Γt, from the partial decay width Γ(t→Wb) measured using the t-channel cross section for single top-quark production and from the branching fraction B(t→Wb) measured in tt̅ events using up to 2.3  fb-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron pp̅ Collider. The result is Γt=1.99-0.55+0.69  GeV, which translates to a top-quark lifetime of τt=(3.3-0.9+1.3)×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 |Vtb|<0.63 at 95% C.L.

Place, publisher, year, edition, pages
2011. Vol. 106, no 2, 022001- p.
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-62028DOI: 10.1103/PhysRevLett.106.022001ISI: 000286746300004OAI: diva2:439453
Swedish Research Council
Publikationen har totalt 433 författare, V. Abazov et al.Available from: 2011-09-07 Created: 2011-09-07 Last updated: 2012-01-26Bibliographically approved

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