Top Quarks at the Tevatron: Measurements of the Top Quark Production and Decay with the D0 Experiment
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
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.
elementary particle physics, D0, Tevatron, top quark
IdentifiersURN: urn:nbn:se:su:diva-879ISBN: 91-7155-222-7OAI: oai:DiVA.org:su-879DiVA: diva2:200580
2006-03-24, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Albrow, Michael, Dr.
Åsman, Barbro, Professor
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