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Evidence for production of single top quarks and first direct measurement of vertical bar V-tb vertical bar
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, no 18, 181802- p.Article in journal (Refereed) Published
Abstract [en]

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron < p(p)over bar > collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(< p(p)over bar >-> tb+X,tqb+X)=4.9 +/- 1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68 <vertical bar V-tb vertical bar <= 1 at 95% C.L. within the standard model.

Place, publisher, year, edition, pages
2007. Vol. 98, no 18, 181802- p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-62539DOI: 10.1103/PhysRevLett.98.181802ISI: 000246210200017OAI: oai:DiVA.org:su-62539DiVA: diva2:442770
Note
authorCount :580Available from: 2011-09-22 Created: 2011-09-22 Last updated: 2017-12-08Bibliographically approved

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Åsman, BarbroClément, ChristopheStrandberg, Sara
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