Browsing Fakultät für Physik (inkl. GAUSS) by Advisor "Quadt, Arnulf Prof. Dr."
Now showing items 21-40 of 40
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Measurement of the Top Quark Pair Production Cross Section and Simultaneous Extraction of the W Heavy Flavor Fraction at √s = 7 TeV with the ATLAS Detector at the LHC
(2012-04-27)The top quark pair production cross section, σtt, is measured in the semileptonic channel in two datasets using a binned profiled likelihood template fit to data to discriminate the signal, tt, from its main background, ... -
Measurement of the ttZ Production Cross Section in the Final State with Three Charged Leptons using 36.1 fb^-1 of pp Collisions at 13 TeV at the ATLAS Detector
(2018-02-14)A measurement of the production cross section for a top quark pair in association with a Z boson (ttZ) is presented in this PhD thesis. Final states with exactly three charged leptons (electrons or muons) are used, taking ... -
Measurement of the tt̄γ production cross section with the ATLAS experiment at √ s = 13 TeV using the full Run 2 data set
(2024-12-19)With Run 1 of the LHC, an unequalled top-quark factory started its operation. While during Run 1 the focus was on tt̄ measurements, the unprecedented size of the ATLAS Run 2 data set of 140 fb −1 allows for precise ... -
Measurement of the W Boson Helicity Fractions in Top/anit-Top Events at 8 TeV in the Lepton + Jets Channel with the ATLAS Detector
(2017-04-28)Precise measurements of the properties of the top quark allow for testing the Standard Model (SM) and can be used to constrain new physics models. The top quark is predicted in the SM to decay almost exclusively to a W ... -
Measurement of the W-boson Polarisation in Top-Quark Decays with the ATLAS Detector
(2013-09-20)A measurement of the W-boson polarisation in top-quark decays is presented. The top-antitop events were produced in proton-proton collisions at a centre-of-mass energy of sqrt{s} = 7 TeV at the LHC. The data set corresponds ... -
Monitoring and Optimization of ATLAS Tier 2 Center GoeGrid
(2016-02-26)The demand on computational and storage resources is growing along with the amount of infor- mation that needs to be processed and preserved. In order to ease the provisioning of the digital services to the growing number ... -
Monitoring Radiation Damage in the ATLAS Pixel Detector
(2014-11-05)Radiation hardness is one of the most important features of the ATLAS pixel detector in order to ensure a good performance and a long lifetime. Monitoring of radiation damage is crucial in order to assess and predict the ... -
Observation of the Standard Model Higgs boson produced in association with a pair of top quarks at $\sqrt{s} = 13 \, \text{TeV}$ with the ATLAS experiment at the LHC with emphasis on the decay of the Higgs boson into a $b\bar{b}$-pair in the single-lepton channel
(2019-10-30)The top quark is the heaviest elementary particle in the Standard Model and has an expected Yukawa coupling to the Higgs boson of order unity. The value of this coupling is a key ingredient to unravel the nature of the ... -
Physics with Jets in Association with a Z Boson in pp-collisions with the ATLAS Detector at the Large Hadron Collider
(2013-09-16)This thesis presents the measurements of the production cross section of jets in association with a Z boson in pp-collisions at √s = 7 TeV with an integrated luminosity of ∫Ldt = 36 pb−1 and ∫Ldt = 4.6 fb−1 recorded ... -
Pixel Detector Studies for the ATLAS ITk Upgrade for the HL-LHC
(2023-06-02)The integrated luminosity of the Large Hadron Collider (lhc), which is proportional to the number of particles colliding and thus data being collected, is planned to be increased by a factor of 5-7.5 compared to the ... -
Precision Measurements of the Top Quark Pair Production Cross Section in the Single Lepton Channel with the ATLAS Experiment
(2012-05-10)Two precision measurements of the top quark pair production cross section in the lepton+jets channel are accomplished using data taken by the ATLAS experiment at the Large Hadron Collider at CERN. The data corresponds to ... -
Radiation Hard 3D Diamond Sensors for Vertex Detectors at HL-LHC
(2016-02-12)Diamond is a good candidate to replace silicon as sensor material in the innermost layer of a tracking detector at HL-LHC, due to its high radiation tolerance. After particle fluences of $10^{16}\,{\rm protons/cm^2}$, ... -
Search for the production of four top quarks in proton-proton collisions at $\sqrt{s}=13$ TeV in the single lepton and opposite-sign dilepton channels with the ATLAS detector at the Large Hadron Collider
(2020-07-28)This thesis presents the search for the production of $t\bar{t}t\bar{t}$ from $pp$ collision at $\sqrt{s} = 13$ TeV. The analysed dataset has been collected by the ATLAS detector during the LHC Run 2, corresponding to an ... -
Search for the production of four top quarks in proton-proton collisions at $\sqrt{s}=13\,$TeV in the single and opposite sign dilepton channels with the ATLAS detector at the LHC using a Monte Carlo correction method
(2020-10-13)The search for the production of $\text{t}\bar{\text{t}}\text{t}\bar{\text{t}}$ in $pp$ collisions at $\sqrt{s}\,=\,13\,$TeV is presented in this thesis for the full \lhc \runii dataset of 139$\,$fb$^{-1}\,$collected by ... -
Search for the Standard Model Higgs boson produced in association with a pair of top quarks and decaying into a bb-pair in the single lepton channel at √s = 13 TeV with the ATLAS experiment at the LHC
(2017-07-05)This thesis presents a search for Standard Model Higgs boson produced in association with top quark pairs, ttH. The analysis uses 13.2 fb-1 of pp collision data at √s = 13 TeV collected in 2015 and 2016 ... -
Search for the Standard Model Higgs boson produced in association with a pair of top quarks and decaying into a bb-pair in the single lepton channel at sqrt{s} = 8 TeV with the ATLAS experiment at the LHC
(2016-08-18)This thesis focuses on the search for the Standard Model Higgs boson produced in association with a pair of top quarks, ttH, using 20.3 fb-1 of pp collision data at sqrt{s} = 8 TeV, collected with the ATLAS detector at the ... -
Search for the Standard Model Higgs boson produced in association with tt and decaying into bb at 8 TeV with the ATLAS detector using the Matrix Element Method
(2015-11-02)A search for the Standard Model Higgs boson produced in association with a pair of top quarks (ttH) is presented. The analysis uses 20.3 fb−1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the ... -
Test beam studies of pixel detector prototypes for the ATLAS-Experiment at the High Luminosity Large Hadron Collider
(2019-06-26)The upgrade of the Large Hadron Collider (LHC) in the mid-2020’s to the High Luminosity Large Hadron Collider will provide large amounts of data, enabling precision measurements of Standard Model processes and searches for ... -
The Readout System for the ITk Pixel Demonstrator for the ATLAS High-Luminosity Upgrade
(2020-05-28)The upgrade of the Large Hadron Collider to the High Luminosity Large Hadron Collider starting in 2024 will allow the experiments to collect approximately ten times more data for precision measurements of Standard Model ... -
Z →ττ Cross Section Measurement and ττ Mass Reconstruction with the ATLAS Detector at the LHC
(2012-11-14)In this dissertation, the Z to tautau decay where one τ decays leptonically and the other one hadronically is presented. The process is studied with data collected from the ATLAS experiment in pp collisions at c-m-s = 7 TeV ...