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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24221

Title: Measurement of the Top Quark Pair Production Cross-section in the Dilepton Channel using Lepton plus Track Selection and Identified b-jets
Authors: Spreitzer, Teresa
Advisor: Savard, Pierre
Department: Physics
Keywords: Top
Quark
Cross-section
Dilepton
b-jets
CDF
Issue Date: 1-Apr-2010
Abstract: Using 1.0 fb^{-1} of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, we measure the top-antitop production cross-section in events with two leptons, significant missing transverse energy, and at least jets, at least one of which is identified as a b-jet. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t-> W b ->l nu b, is of particular interest due to its high purity. Use of an isolated track as the second lepton significantly increases the dilepton acceptance, at the price of some increase in background, particularly from W + jets events where one of the jets is identified as a lepton. To control the increase in background we add to the event selection the requirement that at least one of the jets be identified as a b-jet, reducing the background contribution from all sources. Assuming a branching ratio of BR(W->l nu) = 10.8% and a top mass of m_top = 175 GeV/c^{2} the measured cross-section is sigma = (10.5 +/- 1.8 stat. +/- 0.8 syst. +/- 0.6 lumi.) pb.
URI: http://hdl.handle.net/1807/24221
Appears in Collections:Doctoral
Department of Physics - Doctoral theses

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