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Meshreki, John: Differential cross-section measurements of the associated production of top quarks with a photon at 13 TeV with the ATLAS detector. 2021
Inhalt
Acknowledgements
Abstract
Zusammenfassung
Contents
1 Introduction
2 Top quark at the Standard Model
2.1 The Standard Model
2.2 Top-quark physics
2.3 Top-quark production in association with photons
3 Experimental Setup
3.1 The ATLAS detector
3.1.1 Coordinates of the detector
3.1.2 Magnet systems
3.1.3 Inner Detector
3.1.4 Calorimeters
3.1.5 Muon Spectrometer
3.1.6 Trigger system
4 Object definition
4.1 Electrons
4.1.1 Reconstruction
4.1.2 Identification and isolation
4.2 Muons
4.2.1 Reconstruction
4.2.2 Identification and isolation
4.3 Photons
4.3.1 Reconstruction
4.3.2 Identification and isolation
4.3.3 Shower shapes reweighting
4.4 Jets
4.4.1 Reconstruction
4.4.2 Calibration
4.4.3 b-tagging
4.5 Missing transverse energy
5 Shower shapes reweighting for photons
5.1 Data and MC samples
5.2 Cell-based energy reweighting of photons
5.3 Event selection
5.4 Pure Z ee sample
5.5 Results of cell-based reweighting
5.5.1 Background reduction
5.5.2 Cell-based energy reweighting
6 Data and MC simulation for tbart + tW measurement
6.1 Data
6.2 MC simulation
6.3 Simulation of signal
6.4 Simulation of background processes
6.5 Overlap removal between samples
7 Object and event selection
7.1 Object-level selection
7.2 Event-level selection
8 Analysis strategy
8.1 Fiducial phase-space definition
8.2 Differential cross-sections
8.3 Unfolding methodology
8.3.1 Iterative Bayesian unfolding
8.3.2 Binning optimisation
8.3.3 Performance and optimisation studies using pseudo-data
9 Systematic uncertainties
9.1 Experimental uncertainties
9.2 Modelling uncertainties
10 Results
10.1 Absolute cross-section measurements
10.2 Normalised cross-section measurements
11 Conclusions and outlook
Bibliography
A Additional shower shapes and fit results
B Additional cross-section results