Abajyan, Tatevik: Measurement of the top quark pair production cross section with the ATLAS detector at LHC in pp collisions at √s =7 TeV in dilepton final states. - Bonn, 2012. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5n-28174
@phdthesis{handle:20.500.11811/5297,
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5n-28174,
author = {{Tatevik Abajyan}},
title = {Measurement of the top quark pair production cross section with the ATLAS detector at LHC in pp collisions at √s =7 TeV in dilepton final states},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2012,
month = jun,

note = {The production cross section of top quark pairs in proton-proton collisions at center-of-mass energy of 7 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider is measured. The goal of the analysis is to provide a benchmark test of perturbative QCD and the Standard Model by measuring the tt production cross section in data and compare the measurement with theoretical predictions. Within the Standard Model, a top quark almost exclusively decays to a W-boson and a b-quark. Using a data sample of 35 pb-1, candidate events are selected in the dilepton topology (where both W-bosons from tt decay leptonically) with large missing transverse energy and at least two jets. The branching ratio of this process is 6.5%. The theoretical expectation for tt production cross section in proton-proton collisions at center-of-mass energy of 7 TeV is 165+11
-16
pb. Backgrounds from Z/γ*ll and mis-identified leptons are estimated from data. Results include detailed studies of systematic uncertainties. A tt production cross section 181 ± 22(stat.) ± 14(syst.)+8
-7
(lumi) pb is measured for an assumed top quark mass of 172.5 GeV.},

url = {http://hdl.handle.net/20.500.11811/5297}
}

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