Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Quadt, Arnulf Prof. Dr."
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Aspects of QCD uncertainties and fast QCD predictions for high-energy collider experiments
(2016-12-20)We address the issue of how to provide accurate perturbative QCD predictions along with their theory uncertainties in a systematic and fast way using Monte-Carlo event generators, considering that state-of-the-art calculations ... -
Calibration of the ATLAS B-tagger and the search for the $t\overline{t}H(H\rightarrow b\overline{b})$ process at $\sqrt{s}$ = 13 TeV with the ATLAS experiment at the LHC
(2019-04-24)Top quarks and Higgs bosons are the heaviest particles in the Standard Model of particle physics and are the subject of many analyses performed with the ATLAS experiment at the LHC at CERN. The Higgs boson was discovered ... -
Calorimeter-Based Triggers at the ATLAS Detector for Searches for Supersymmetry in Zero-Lepton Final States
(2012-03-09)This thesis consists of three closely related parts. An analysis of data recorded by the ATLAS detector in 2010 in proton-proton collisions at a center-of-mass energy of 7 TeV with an ... -
Cross-section measurements of top-quark pair production in association with a hard photon at 13 TeV with the ATLAS detector
(2020-08-25)25 years after the top quark's discovery, the Large Hadron Collider at CERN produces proton-proton collision data on unprecedented scales at unprecedented energies – and has heralded an era of top-quark precision measurements. ... -
Data intensive ATLAS workflows in the Cloud
(2018-06-06)Large physics experiments, such as ATLAS, have participating physicists and institutes all over the Globe. Nowadays, physics analyses are performed on data that is stored thousands of kilometres away. This is possible due ... -
Detector Development for the High Luminosity Large Hadron Collider
(2016-08-18)To maximise the discovery potential of the Large Hadron Collider, it will be upgraded to the High Luminosity Large Hadron Collider in 2024. New detector challenges arise from the higher instantaneous luminosity and the ... -
Development and validation of a model for the response of the Belle II vertex detector
(2014-11-06)The future super flavour factory SuperKEKB with its detector system Belle II offers precision physics measurements to test the Standard Model or probe undiscovered phenomena. The physics goals of Belle II require a very ... -
Development of Pixel Module Assembly Processes for the Phase 2 Upgrade of the ATLAS Detector and Test Beam Measurements with Diamond Pixel Detectors
(2020-02-25)One of the most powerful machines to study particle physics is the Large Hadron Collider (LHC). Starting in 2024, it will be upgraded to the High Luminosity-LHC (HL-LHC) to deliver even more data to measure with high ... -
Development of the readout for the IBL Upgrade Project of the ATLAS Pixel Detector
(2012-12-05)The LHC luminosity is upgraded in several phases until 2022. The resulting higher occupancy degrades the detector performance of the current Pixel Detector. To provide a good performance during the LHC luminosity upgrade, ... -
Direct Top Quark Decay Width Measurement in the tt Lepton+Jets Channel at 8 TeV with the ATLAS Experiment
(2017-11-09)The top quark t plays an essential role in the field of elementary particle physics - in particular due to its exceptional properties comprising a large mass, which approximately equals the mass of a tungsten atom, and an ... -
Fiducial cross-section measurements of the production of a prompt photon in association with a top-quark pair at $\sqrt{s}=13$ TeV with the ATLAS detector at the LHC
(2018-11-23)The cross sections for top-quark pair production in association with a photon are measured in a fiducial volume with the ATLAS detector at a centre-of-mass energy of 13 TeV. Results are presented using proton-proton collision ... -
HappyFace as a monitoring tool for the ATLAS experiment
(2016-10-24)The importance of monitoring on HEP grid computing systems is growing due to a significant increase in their complexity. Computer scientists and administrators have been studying and building effective ways to gather ... -
Hochauflösende Bildgebung und NEXAFS-Spektroskopie mit weicher Röntgenstrahlung aus laserinduzierten Plasmen
(2019-01-24)Soft x-ray microscopy and absorption spectroscopy are extremely useful tools for high-resolution imaging and chemical analysis of samples in various scientific fields. However, due to the required high photon flux of ... -
Investigation of the CP properties of VBF Higgs production in hadronic final states of H → τ τ decays with the ATLAS detector
(2021-02-15)A test of CP invariance of the VBF Higgs production process is presented in the τ τ final state. For this, a profile likelihood fit using a matrix-element observable method is employed to test whether a CP-odd component ... -
Legacy cross-section measurements of the $t\bar{t}Z$ production process in the trileptonic final state at $\sqrt{s}=13\,$TeV with the ATLAS detector
(2024-01-31)After three years of data-taking during the second run of the LHC at CERN, Geneva, Switzerland, the ATLAS detector has recorded its most extensive proton-proton collision data set to date, allowing for a wide range of ... -
Measurement of Spin Correlations in Top/Anti-Top Events from pp Collisions at sqrt(s) = 7 TeV in the Lepton+Jets Final State with the ATLAS Detector
(2014-09-25)The top quark decays before it hadronises. Before its spin state can be changed in a process of strong interaction, it is directly transferred to the top quark decay products. The top quark spin can be deduced by studying ... -
Measurement of the $W$ Boson Polarisation in $t\bar{t}$ Dilepton Events at $\sqrt{s}=8$ TeV with the ATLAS Detector
(2019-10-18)A measurement of the $W$ boson polarisation in top quark decays is presented. The top anti-top pairs were produced at a centre of mass energy of $\sqrt{s}=8$ \tev \ using proton-proton collisions at the LHC. The data sample ... -
Measurement of the associated production of a vector boson (W, Z) and top quark pair in the opposite sign dilepton channel with pp collisions at √s = 8 TeV with the ATLAS detector
(2015-01-08)The heaviest known elementary particle predicted by the Standard Model (SM), the top quark, was discovered in 1995 by the CDF and D0 collaborations. The large top quark mass translates into a coupling to the Higgs boson ... -
Measurement of the charge asymmetry in top quark pair production in in pp collision data at √s = 7 TeV using the ATLAS detector
(2012-03-22)A measurement of the charge asymmetry in the production of top quark pairs in the semileptonic decay channel has been performed. A dataset corresponding to an integrated luminosity of 1.04 fb-1, btained at a centre-of-mass ... -
Measurement of the inclusive <i>tγ</i> cross section at √<i>s</i> = 7 TeV with the ATLAS detector
(2012-06-12)A first measurement of the ttγ cross section in pp collisions at the LHC using 1.04 fb-1 of data taken with the ATLAS detector is presented. A total of 122 candidate events were identified in the single electron and single ...