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Table of contents
Synthèse en français
Contents
Introduction
1 Elementary Particle Physics
1.1 Standard Model of Particle Physics
1.2 Fundamental forces
1.2.1 Electromagnetic interaction
1.2.2 Strong interaction
1.2.3 Electroweak interaction
1.2.4 Spontaneous symmetry breaking and Higgs mechanisms
1.3 Standard Model limitations and BSM theories
1.4 Higgs boson phenomenology
1.4.1 Production at LHC
1.4.2 Decay modes
1.4.3 Discovery at LHC
1.4.4 Properties measured at LHC
1.4.5 Yukawa couplings
2 The LHC and the ATLAS detector
2.1 The LHC
2.2 ATLAS
2.2.1 The inner detector
2.2.2 The calorimeter system
2.2.3 The muon system
2.2.4 The magnets system
2.2.5 The trigger system
2.3 Object reconstruction
2.3.1 Track and vertex reconstruction
2.3.2 Electrons and photons
2.3.3 Muons
2.3.4 Taus
2.3.5 Jets
2.3.6 Missing transverse momentum
3 Electron performance
3.1 Introduction
3.2 Electron efficiencies generalities
3.2.1 Tag and Probe method
3.2.2 Event and object selection
3.2.3 Data and simulation samples
3.3 Electron reconstruction efficiency measurement
3.3.1 Previous measurements
3.3.2 Background estimation
3.3.3 Uncertainties
3.3.4 Efficiency and Scale Factors measurement
3.3.5 Results with new reconstruction and more statistics
3.4 Non-prompt electron tagger efficiency
3.4.1 PromptLeptonIso tagger
3.4.2 Charge flip tagger
3.4.3 Efficiency definition
3.4.4 PromptLeptonIso results
3.4.5 PromptLeptonVeto tagger
3.5 Conclusion
4 Search for flavor changing neutral currents in top decays
4.1 Introduction
4.2 Previous results
4.3 Analysis strategy
4.4 Object and event selections
4.4.1 2`SS channel selections
4.4.2 3` channel selections
4.5 Signal and Backgrounds
4.5.1 Irreducible backgrounds
4.5.2 Reducible backgrounds
4.6 Event MVA
4.6.1 2`SS category
4.6.2 3` category
4.6.3 Optimization
4.7 Results
4.7.1 Fit model
4.7.2 Systematics
4.7.3 Fit results
4.7.4 ATLAS combination
4.8 Conclusions
5 Search for Higgs boson production in association with a top-antitop quark pair
5.1 Observation of the ttH production mode
5.1.1 ttH Multilepton (36 fb−1)
5.1.2 Combination including t¯tH(H !) (79.8 fb−1) and t¯tH(H ! b¯b) (36 fb−1)
5.2 Two-lepton same-sign analysis with 80 fb−1
5.2.1 μμ(Nb-jets 3) Region
5.2.2 Fake lepton estimation
5.2.3 Event yields in the pre-MVA region
5.2.4 Event MVA
5.2.5 Expected fit results
5.3 Current status of 80 fb−1 analysis
Conclusion
Bibliography
