Measurements of observables sensitive to colour reconnection in tt̅ events with the ATLAS detector at √s = 13 TeV / vorgelegt von Shayma Wahdan. Wuppertal, October 2022
Inhalt
- 1 Introduction
- 2 The Standard Model and the top quark
- 3 Event generation and simulation
- 4 The LHC and the ATLAS experiment
- 5 Physics objects and observables definition
- 5.1 Detector-level objects definition
- 5.2 Particle-level objects definition
- 5.3 Event selection
- 5.4 Observables definition
- 5.5 Analysis strategy
- 6 Backgrounds estimation and corrections to observables
- 6.1 Event-based backgrounds estimation
- 6.2 Track-based backgrounds estimation
- 6.2.1 Estimation of the number of secondary and pile-up tracks
- 6.2.2 Estimation of the secondaries and pile-up scale factors
- 6.2.3 Systematic uncertainties in the pile-up scale factor estimation
- 6.2.4 Estimation of track-backgrounds contamination to the ∑ntrk,outpT observable
- 6.3 Corrections to observables
- 7 Differential cross-section measurement
- 7.1 Formulation of the unfolding problem
- 7.2 The Iterative Bayesian unfolding method
- 7.3 Extraction of differential cross-sections
- 7.4 Binning optimisation
- 7.5 Unfolding validation tests
- 8 Systematic uncertainties
- 8.1 Experimental uncertainties
- 8.2 Signal modelling uncertainties
- 8.3 Background modelling uncertainties
- 8.4 Unfolding-technique uncertainties
- 8.5 Statistical uncertainty
- 8.6 Total uncertainty
- 9 Results and interpretation
- 9.1 Particle-level normalised differential cross-section results
- 9.2 Interpretation: χ2 evaluation
- 9.3 Total fiducial cross-section
- 10 Summary and conclusions
- A Simulated samples
- B Systematic uncertainties
- C Particle-level absolute differential cross-section results
- Bibliography
- List of Figures
- List of Tables
- Acknowledgements