Ghasemi, Sara: Cross-section measurement of tt̄γ production in pp collisions at √s = 8 and 13 TeV with the ATLAS experiment. 2019
Inhalt
- Abstract
- Zusammenfassung
- Contents
- Introduction
- Theoretical Context
- The Standard Model of Particle Physics
- Particle Content and the Forces
- Quantum Electrodynamics
- Quantum Chromodynamics
- Electroweak Theory
- The Electroweak Symmetry Breaking and the Brout-Englert-Higgs mechanism
- Proton-Proton Interactions
- Parton Density Functions
- Overview of a Proton-Proton Collision
- Cross Sections in Proton-Proton Collisions
- Top Quark
- Top Quark Pair Production in Association with a Photon
- Experimental Setup
- From Detector to Physics: Event Reconstruction
- Data and Simulated Samples
- Cross-Section Definitions and Likelihood Description
- Cross-Section Measurement of tbart at 8 TeV
- Signal Region Selection
- Analysis Strategy
- Utilisation of Template Fit Method
- Definition of the Fiducial Region
- Fit Strategy
- Theoretical Prediction
- Extraction of Templates
- Background Estimation
- Systematic Uncertainties
- Results
- Cross-Section Measurement of tbart at 13 TeV
- Signal Region Selection
- Analysis Strategy
- Neural Networks
- Definition of the Fiducial Region
- Strategy of Inclusive Cross-Section Measurement
- Strategy of Differential Cross-Section Measurement
- Theoretical Prediction
- Estimation of Hadronic-fake Background
- The ABCD Method
- Treatment of the Photon Isolation–Identification Correlation
- Extraction of Hadronic-fake Scale Factor
- Estimation of other Backgrounds
- Electron-fake Background
- Fake-Lepton Background
- Backgrounds with Prompt Photons
- Summary of Background Yields
- Systematic Uncertainties
- Results
- Summary and Conclusion
- Bibliography
- Appendix