The CERN accelerator complex

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Table of contents

Introduction 
1 Standard Model 
1.1 History
1.2 Matter particles
1.3 Particles interactions
1.3.1 Quantum Electrodynamics
1.3.2 Weak interactions
1.3.3 Quantum Chromodynamics
1.3.4 Electroweak interaction
1.4 Problems/Outlook
1.5 Summary
2 Higgs Physics 
2.1 Brout-Englert-Higgs mechanism
2.2 Higgs production
2.2.1 Gluon-gluon fusion (ggF)
2.2.2 Vector boson fusion (VBF)
2.2.3 Higgs-strahlung
2.2.4 ttH production
2.3 Higgs decays
2.3.1 Fermionic tree-level decay modes
2.3.2 Bosonic tree-level decay modes
2.3.3 Loop-induced decay modes
2.4 Measurement of Higgs properties
2.4.1 Higgs mass
2.4.2 Higgs spin-parity
2.4.3 Higgs width and lifetime
2.4.4 Higgs couplings
2.5 ttH searches at LHC
3 ATLAS at LHC
3.1 The CERN accelerator complex
3.2 The ATLAS detector
3.2.1 ATLAS layout
3.2.1.1 The inner detector
3.2.1.2 Solenoid
3.2.1.3 Calorimetry
3.2.1.4 Muon spectrometer
3.2.1.5 Trigger system [1]
3.2.2 Data quality monitoring in ATLAS
3.2.3 Luminosity measurements in ATLAS
4 Object reconstruction 
4.1 Tracks and primary vertices (PV)
4.2 Electrons
4.2.1 Electron trigger
4.2.2 Electron reconstruction
4.2.3 Electron identification
4.2.4 Electron isolation
4.3 Photons
4.3.1 Photon reconstruction
4.3.2 Photon identification
4.4 Muons
4.4.1 Muon reconstruction
4.4.2 Muon identification
4.5 Taus
4.6 Jets
4.6.1 Jet reconstruction
4.6.2 b-tagged jets
4.7 Conclusion
5 Measurement of the electron reconstruction efficiency
5.1 Definition
5.2 Method
5.2.1 Tag-and-Probe method with Z ! ee events
5.2.2 Background estimation
5.2.2.1 Background for clusters with an associated track
5.2.2.2 Background for clusters with no associated track
5.2.3 Uncertainties
5.3 Dataset and simulation
5.4 Results
5.4.1 Background level at denominator and numerator
5.4.2 Efficiency
5.4.3 Scale Factors
5.4.4 Combination
5.5 Conclusion
6 ttH Multilepton analysis with 13.2 
6.1 Dataset and simulation
6.1.1 Data sample
6.1.2 Signal MC sample
6.1.3 Background MC samples
6.2 Signal region
6.2.1 Object definition
6.2.1.1 Electron
6.2.1.2 Muon
6.2.1.3 Tau
6.2.1.4 Jets and b-tagged jets
6.2.1.5 Overlap removal
6.2.2 Signal region definition
6.3 Data-driven background estimation
6.3.1 Charge flip estimation
6.3.2 Fake lepton estimation with the Matrix Method
6.3.2.1 Description of Matrix Method
6.3.2.2 Inputs to Matrix Method
6.3.2.3 Validation
6.3.2.4 Results
6.3.3 Comparison with the Fake Factor method
6.4 Validation regions for prompt leptons background
6.5 Fit results in 2`ss channel
6.5.1 Likelihood function
6.5.2 Systematics
6.5.3 Signal strength
6.6 First ttH combination with 13 TeV data
6.6.1 ttH Multilepton
6.6.2 All ttH decays
6.7 Conclusions and prospects
Conclusion
Bibliography