Associated Production of a Top Quark and a Z Boson in pp Collisions at √s = 13 TeV Using the ATLAS Detector
Associated Production of a Top Quark and a Z Boson in pp Collisions at √s = 13 TeV Using the ATLAS Detector
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DissertationPrüfungsdatum
24.07.2018Datum der Veröffentlichung
26.09.2018Erstgutachter
Brock, Ian C.Zweitgutachter
Dingfelder, Jochen ChristianMetadaten
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Inhalt
The production of a top quark in association with an Z boson is studied using 36.1 fb-1 of proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of 13 TeV. The search is performed in the trilepton channel, in which both the Z boson and the top quark decay to final states involving charged leptons. Events containing three identified leptons (electron and/or muon) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds come from diboson, top-pair production and Z+jets production. An artificial neural network is used to improve the background rejection and the tZq production cross-section is extracted. The result is in agreement with the Standard Model prediction and has an observed significance of 4.2 σ, thus yielding the first evidence for tZq associated production.
Klassifikation (DDC)
530 PhysikReihe, Nummer
BONN-IR ; 2018-07Cioară, Irina Antonela: Associated Production of a Top Quark and a Z Boson in pp Collisions at √s = 13 TeV Using the ATLAS Detector. - Bonn, 2018. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5n-51941
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5n-51941
@phdthesis{handle:20.500.11811/7636,
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5n-51941,
author = {{Irina Antonela Cioară}},
title = {Associated Production of a Top Quark and a Z Boson in pp Collisions at √s = 13 TeV Using the ATLAS Detector},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2018,
month = sep,
volume = 2018-07,
note = {The production of a top quark in association with an Z boson is studied using 36.1 fb-1 of proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of 13 TeV. The search is performed in the trilepton channel, in which both the Z boson and the top quark decay to final states involving charged leptons. Events containing three identified leptons (electron and/or muon) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds come from diboson, top-pair production and Z+jets production. An artificial neural network is used to improve the background rejection and the tZq production cross-section is extracted. The result is in agreement with the Standard Model prediction and has an observed significance of 4.2 σ, thus yielding the first evidence for tZq associated production.},
url = {https://hdl.handle.net/20.500.11811/7636}
}
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5n-51941,
author = {{Irina Antonela Cioară}},
title = {Associated Production of a Top Quark and a Z Boson in pp Collisions at √s = 13 TeV Using the ATLAS Detector},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2018,
month = sep,
volume = 2018-07,
note = {The production of a top quark in association with an Z boson is studied using 36.1 fb-1 of proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of 13 TeV. The search is performed in the trilepton channel, in which both the Z boson and the top quark decay to final states involving charged leptons. Events containing three identified leptons (electron and/or muon) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds come from diboson, top-pair production and Z+jets production. An artificial neural network is used to improve the background rejection and the tZq production cross-section is extracted. The result is in agreement with the Standard Model prediction and has an observed significance of 4.2 σ, thus yielding the first evidence for tZq associated production.},
url = {https://hdl.handle.net/20.500.11811/7636}
}
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