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Evidence for production of single top quarks and first direct measurement of vertical bar V-tb vertical bar
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, no 18, 181802-1-181802-8 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, 181802-1-181802-8 p.
Keyword [en]
BOOSTED DECISION TREES, NEURAL-NETWORKS, FERMILAB-TEVATRON, PARTICLE IDENTIFICATION, SEARCH, COLLISIONS, COLLIDER, DETECTOR, EVENTS, BOSON
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-35515DOI: 10.1103/PhysRevLett.98.181802ISI: 000246210200017Scopus ID: 2-s2.0-34247889903OAI: oai:DiVA.org:kth-35515DiVA: diva2:428917
Note
QC 20110701Available from: 2011-07-01 Created: 2011-07-01 Last updated: 2017-12-11Bibliographically approved

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Strandberg, Jonas

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