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Search for flavour-changing neutral current interactions in the top-quark Higgs boson sector in multi-lepton final states with the ATLAS detector at the [...] / von Oliver Thielmann. Wuppertal, Oktober 2023
Content
1 Introduction
2 The Standard Model of particle physics
2.1 Particles and interactions
2.2 Electroweak theory
2.3 Quantum chromodynamics
2.4 Experimental validation
2.5 Limitations
3 Flavour-changing neutral currents
3.1 FCNCs in the SM
3.2 FCNCs in Beyond-Standard-Model theories
3.3 FCNC tqH processes
4 The Large Hadron Collider and the ATLAS experiment
4.1 The Large Hadron Collider complex
4.1.1 The pre-accelerators
4.1.2 The Large Hadron Collider
4.2 The ATLAS Detector
4.2.1 Coordinate system
4.2.2 Inner detector
4.2.3 Calorimeters
4.2.4 Muon spectrometer
4.2.5 Trigger system
4.2.6 Luminosity measurement
5 Simulation of proton-proton collisions
6 Object definitions
6.1 Tracks and vertices
6.2 Electrons
6.3 Muons
6.4 Jets
6.5 Flavour tagging
6.6 Non-prompt lepton sources
6.7 Missing transverse momentum
6.8 Overlap removal
7 Data and simulated samples
7.1 Recorded data and trigger
7.2 Signal FCNC samples
7.3 Background samples
7.4 Building the non-prompt lepton templates
8 Event selection and region definition
8.1 Tri-lepton regions
8.2 Di-lepton same sign regions
9 Reconstruction
9.1 Neutrino weighting method
9.2 Reconstructed Z-boson mass
9.3 Neutrino-independent combinatorics estimator
9.4 Same-charged and opposite-charged leptons
9.5 Recursive jigsaw reconstruction
10 Multivariate analysis
10.1 Feed-forward neural networks
10.2 NeuroBayes
10.3 Applying the neural network
11 Statistical analysis techniques
11.1 Binned profile likelihood fits
11.2 Hypothesis testing
12 Systematic uncertainties
12.1 Experimental systematic uncertainties
12.2 Theoretical uncertainties
12.3 Implementation of systematic uncertainties
13 FCNC search results
13.1 Background-only fit
13.2 Realistic Asimov fit
13.3 Realistic Asimov fit results and exclusion limits
14 Conclusion and outlook
Appendices
A b-tagging WP study
B Monte Carlo Samples
C Comparison of the left- and right handed prod-FCNC processes
D Composition of the non-prompt templates
D.1 Composition in the 3 regions
D.2 Composition in the 2SS regions
E Pre-fit event yields
F Plots related to the background-only fit
G Validation plots of kinematic distributions
G.1 Validation plots for the 2SS regions
G.2 Validation plots for the 3 regions
H Plots related to the realistic Asimov Fit
Bibliography