Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector

Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector

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A measurement of the ttZ production cross section with the ATLAS detector in pp collisions at the LHC is presented. The search is performed on 13.0 fb−¹ of data collected in 2012. Only final states with three leptons are considered, in which the Z boson decays to a pair of leptons and one of...

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Main Author: Khazraie Zamanpour, Arash
Language:English
Published: University of British Columbia 2013
Online Access:http://hdl.handle.net/2429/44055
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spelling ndltd-UBC-oai-circle.library.ubc.ca-2429-440552018-01-05T17:26:28Z Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector Khazraie Zamanpour, Arash A measurement of the ttZ production cross section with the ATLAS detector in pp collisions at the LHC is presented. The search is performed on 13.0 fb−¹ of data collected in 2012. Only final states with three leptons are considered, in which the Z boson decays to a pair of leptons and one of the W bosons coming from t → bW decays gives rise to a lepton after decay. An excess of 8.95 ± 0.62 (stat) +0.37 -0.59(sys) events above background is observed with a significance of 3.64 standard deviations above zero. We have assumed no statistical error on the acceptance or efficiency of detection. In the trilepton channel, a direct measurement of the ttZ production cross section of σ = 254 ± 104 (stat) ± 19 (sys) fb is obtained. Science, Faculty of Physics and Astronomy, Department of Graduate 2013-03-21T22:10:07Z 2013-03-22T09:10:36Z 2012 2013-05 Text Thesis/Dissertation http://hdl.handle.net/2429/44055 eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ University of British Columbia
collection NDLTD
language English
sources NDLTD
description A measurement of the ttZ production cross section with the ATLAS detector in pp collisions at the LHC is presented. The search is performed on 13.0 fb−¹ of data collected in 2012. Only final states with three leptons are considered, in which the Z boson decays to a pair of leptons and one of the W bosons coming from t → bW decays gives rise to a lepton after decay. An excess of 8.95 ± 0.62 (stat) +0.37 -0.59(sys) events above background is observed with a significance of 3.64 standard deviations above zero. We have assumed no statistical error on the acceptance or efficiency of detection. In the trilepton channel, a direct measurement of the ttZ production cross section of σ = 254 ± 104 (stat) ± 19 (sys) fb is obtained. === Science, Faculty of === Physics and Astronomy, Department of === Graduate
author Khazraie Zamanpour, Arash
spellingShingle Khazraie Zamanpour, Arash
Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
author_facet Khazraie Zamanpour, Arash
author_sort Khazraie Zamanpour, Arash
title Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
title_short Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
title_full Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
title_fullStr Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
title_full_unstemmed Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector
title_sort measurement of the ttz production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 tev pp collision data collected by the atlas detector
publisher University of British Columbia
publishDate 2013
url http://hdl.handle.net/2429/44055
work_keys_str_mv AT khazraiezamanpourarash measurementofthettzproductioncrosssectioninthethreeleptonfinalstatewith130fb1ofs8tevppcollisiondatacollectedbytheatlasdetector
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