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Top Quarks at the Tevatron: Measurements of the Top Quark Production and Decay with the D0 Experiment
Stockholm University, Faculty of Science, Department of Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents two measurements of the top quark using 230 pb-1 of data taken with the D0 detector at the Tevatron accelerator. The first measurement determines the top pair production cross section at sqrt(s)=1.96 TeV in proton-antiproton collisions. In the standard model of particle physics the top quark decays almost exclusively into a W boson and a b quark. Candidate events are selected by requiring that at least one jet in the event is tagged with the secondary vertex algorithm. The measured top pair production cross section is:

8.6 +1.6-1.5 (stat. + syst.) +- 0.6 (lumi.) pb.

The second measurement uses the observed and predicted number of events with 0, 1 and 2 b-tagged jets to estimate the ratio R:

R = B(t->Wb) / B(t->Wq)

where q stands for any down-type quark. The measured value is

R = 1.03 +0.19-0.17 (stat. + syst.)

in good agreement with the standard model prediction of R=1. The result can be used to obtain a lower limit for R:

R > 0.61 (95% C.L.).

Place, publisher, year, edition, pages
Stockholm: Fysikum , 2006. , 149 p.
Keyword [en]
elementary particle physics, D0, Tevatron, top quark
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-879ISBN: 91-7155-222-7 (print)OAI: oai:DiVA.org:su-879DiVA: diva2:200580
Public defence
2006-03-24, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Opponent
Supervisors
Available from: 2006-03-02 Created: 2006-03-02Bibliographically approved
List of papers
1. Measurements of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Lepton+Jets Events with Lifetime b-tagging
Open this publication in new window or tab >>Measurements of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Lepton+Jets Events with Lifetime b-tagging
2005 In: Physics letters B, ISSN 0370-2693, Vol. B626, 35-44 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25814 (URN)
Note
Part of urn:nbn:se:su:diva-879Available from: 2006-03-02 Created: 2006-03-02Bibliographically approved
2. Simultaneous Measurement of B(t->Wb)/B(t->Wq) and the ttbar Production Cross Section at sqrt(s)=1.96 TeV
Open this publication in new window or tab >>Simultaneous Measurement of B(t->Wb)/B(t->Wq) and the ttbar Production Cross Section at sqrt(s)=1.96 TeV
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25815 (URN)
Note
Part of urn:nbn:se:su:diva-879Available from: 2006-03-02 Created: 2006-03-02 Last updated: 2010-01-13Bibliographically approved

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