Browsing Fakultät für Physik (inkl. GAUSS) by Advisor & Referee "Quadt, Arnulf Prof. Dr."
Now showing items 1-20 of 50
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Development of the detector readout for the ATLAS Phase II ITk pixel detector
(2025-01-23)During the HL-LHC upgrade, a high luminosity upgrade takes place, where the instantaneous luminosity will reach 7.5 × 10^(34) cm^(−2)s^(−1) in Run 4. The current inner detector of the ATLAS experiment will be replaced by ... -
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 ... -
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 ... -
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 ... -
Search for BSM A/H → τ τ in the Fully Hadronic Decay Channel with ATLAS
(2021-11-16)In 2012, a scalar boson was found at CERN that is consistent with the properties of the Higgs boson predicted by the Standard Model (SM) of particle physics. Some theories, in particular supersymmetric models, also predict ... -
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 ... -
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 ... -
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. ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Direct measurement of the top-quark decay width with the ATLAS detector
(2019-07-10)The top quark is the heaviest known elementary particle. Due to its large mass, the top quark decays before it forms bound states. This makes the top quark a unique particle in the Standard Model. Precise measurements of ... -
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 ... -
Measurement of the Higgs boson production in the H → ττ → τlepτhad decay channel at √s = 13 TeV with the ATLAS detector at the LHC
(2019-06-14)This thesis presents a measurement of the Standard Model Higgs boson production in the H → ττ decay with particular emphasis on the final state in which one tau decays hadronically and the other one decays leptonically, ... -
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 ... -
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 ... -
Measurement of the Higgs Boson Production Cross Section in Hadronic Final States in 13 TeV Proton-Proton Collisions with the ATLAS Detector
(2019-01-04)The couplings of the Standard Model Higgs boson to fermions provide valuable insights into the nature of electroweak symmetry breaking in the Yukawa sector. This thesis summarises the measurement of the Higgs boson ... -
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 ...