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Top quarks at the Tevatron: Measurements of the top quark production and decay with the D0 experiment
Stockholms universitet.ORCID iD: 0000-0002-8913-0981
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
Fysikum , 2006. , 149 p.
Keyword [en]
elementary particle physics, D0, Tevatron, top quark
National Category
Subatomic Physics
URN: urn:nbn:se:kth:diva-84528ISBN: 91-7155-222-7OAI: diva2:499532
Public defence
2006-03-24, sal FA31, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
QC 20120529Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2012-05-29Bibliographically approved

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Strandberg, Jonas
Subatomic Physics

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