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Simultaneous heavy flavor fractions and top cross section measurement at the Collider Detector at Fermilab

Posted on:2011-11-02Degree:Ph.DType:Dissertation
University:The Johns Hopkins UniversityCandidate:Mathis, Mark JFull Text:PDF
GTID:1440390002453031Subject:Physics
Abstract/Summary:
This dissertation describes the measurement of the top pair production cross section, using data from proton-antiproton collisions at a center-of-mass energy of 1.96 TeV, with 2.7 +/- 0.2 fb-1 of data collected by the Collider Detector at Fermilab.;Background contributions are measured concurrently with the top cross section in the b-tagged lepton-plus-jets sample using a kinematic fit, which simultaneously determines the cross sections and normalizations of tt¯, W + jets, QCD, and electroweak processes. This is the first application of a procedure of this kind.;The top cross section is measured to be sigmatt¯ = 7.64 +/- 0.57(stat + syst) +/- 0.45(lumi) pb and the Monte Carlo simulation scale factors KWbb¯ = 1.57 +/- 0.25, KWcc¯ = 0.94 +/- 0.79, KWc = 1.9 +/- 0.3, and K Wqq¯ = 1.1 +/- 0.3. These results are consistent with existing measurements using other procedures. More data will reduce the systematic uncertainties and will lead to the most precise of any single analysis to date.
Keywords/Search Tags:Cross section, Data
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