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Measurements of the Top Quark Pair Production Cross Section and an Estimate of the DØ Silicon Detector Lifetime
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

This thesis presents two measurements of the top quark pair production cross section at sqrt{s} = 1.96 TeV using data from the DØ experiment. Both measurements are performed in the dilepton final state and make use of secondary vertex b-tagging. With 158 pb-1 of data in the electron-muon final state, the measured cross section is:

σ(top-antitop) = 11.1 +5.8 -4.3 (stat) +- 1.4 (syst) +- 0.7 (lumi) pb.

With 425 pb-1 of data in the electron+track and muon+track final states, the measured cross section is:

sigma(top-antitop) = 6.3 +2.1 -1.8 (stat) +- 1.1 (syst) +- 0.4 (lumi) pb.

Both measurements are in agreement with the prediction from perturbative QCD calculations. In addition, an estimate of the DØ silicon detector lifetime is presented. The radiation damage is determined by studying the depletion voltage of the silicon sensors as a function of time. Based on this data the silicon detector is estimated to remain operational up to delivered luminosities of 6-8 fb-1.

Place, publisher, year, edition, pages
Stockholm: Fysikum , 2007. , 208 p.
Keyword [en]
particle physics, top quark pair production cross section, silicon radiation damage, DØ detector, Tevatron accelerator
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-6642ISBN: 91-7155-386-XOAI: diva2:196801
Public defence
2007-03-09, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Available from: 2007-02-15 Created: 2007-02-12Bibliographically approved

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