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Table of contents
Introduction
1 Theoretical framework
1.1 The Standard Model of particle physics
1.1.1 Elementary particles
1.1.2 The Standard Model
1.1.2.1 Quantum Electrodynamic theory
1.1.2.2 Electroweak theory
1.1.3 Quantum Chromodinamic theory
1.1.4 The Higgs mechanism
1.1.4.1 Higgs boson production
1.1.4.2 Higgs boson Couplings
1.1.4.3 Higgs boson decay
1.1.5 Discovery of the Higgs boson
1.2 Top quark physics
1.2.1 Top quark production
1.2.2 Single top quark production
1.2.3 Top quark decays
1.2.4 Top quark properties
1.2.4.1 Top quark mass
1.2.4.2 Electric charge
1.2.4.3 Helicity of W boson
1.2.4.4 Spin correlation
1.2.4.5 Yukawa coupling
1.2.5 tt Higgs associated production
2 Accelerator and Detector
2.1 LHC accelerator
2.2 ATLAS detector
2.2.1 Overview
2.2.2 Magnetic System
2.2.3 Inner detector
2.2.4 Calorimeters
2.2.4.1 The electromagnetic calorimeter
2.2.4.2 The hadronic calorimeter
2.2.4.3 The forward calorimeter
2.2.5 Muon Spectrometer
2.3 Trigger system
2.4 Computing
3 ATLAS Trigger system
3.1 ATLAS trigger infrastructure
3.1.1 First Level Trigger (LVL1)
3.1.2 Second Level Trigger (LVL2)
3.1.3 Event Filter (EF)
3.2 Trigger objects
3.2.1 Jet trigger objects
3.2.2 L1.5 Jet Trigger
3.2.3 Jet trigger performance
3.2.4 Tracking objects
3.2.5 Muon trigger objects
3.3 On-line b-tagging algorithm
3.3.1 The role of the b-tagging in physics analyses
3.3.2 b-jet trigger implementation
3.3.2.1 Primary vertex reconstruction
3.3.2.2 b-tagging discriminant variables
3.3.2.3 JetProb method
3.3.2.4 The likelihood-ratio method
3.3.2.5 The SV1 algorithm
3.3.2.6 The combined algorithm
3.3.2.7 b-jet trigger rate
3.3.3 -in-jet trigger
3.4 Trigger Monitoring
3.4.1 Data Quality Monitoring online
3.4.1.1 DQMD for the b-jet signature
3.4.2 Online Histogram Presenter
3.4.3 Oine DQMF framework
3.4.3.1 -jet trigger
3.5 Conclusion
4 Measurement of the tt production cross section in the fully hadronic nal state
4.1 The tt fully hadronic channel topology
4.2 Data and Monte Carlo datasets
4.3 Data and MC treatment at pre-analysis level
4.3.1 Pile-up
4.4 Object identification and selection
4.4.1 Jets
4.4.1.1 Jet vertex fraction
4.4.2 Lepton and missing transverse momentum
4.4.2.1 Electrons
4.4.2.2 Muons
4.4.2.3 Missing Transverse Energy
4.4.3 O,ine identification of b-jets
4.5 Event Selection
4.6 Characterization of the background sources to the tt fully hadronic events
4.6.1 W and Z boson production
4.6.2 tt non hadronic background
4.6.3 Multi-jet QCD background
4.7 Kinematic Fit Likelihood
4.7.1 Top mass distribution
4.8 Multi-jet QCD background modeling
4.9 Minimum 2 discriminant
4.10 Event Probability
4.11 Cross-section measurement
4.12 Control Plots for the main kinematic variables
4.13 Systematic uncertainties
4.13.1 Jet energy scale (JES) and the associated uncertainty
4.13.1.1 Flavour composition and response
4.13.1.2 b-jet energy scale (b-JES)
4.13.1.3 Close by jets
4.13.1.4 Pile-up
4.13.2 Jet reconstruction eciency (JRE)
4.13.3 Jet energy resolution (JER)
4.13.4 Trigger eciency
4.13.5 b-tagging eciency and mistag rate
4.13.6 Theoretical Uncertainty
4.13.6.1 Initial and Final State Radiation (ISR and FSR)
4.13.6.2 Parton Distribution Function (PDF)
4.13.6.3 Parton shower and generator uncertainties
4.13.7 Luminosity
4.13.8 Background modelling
4.14 Summary of systematic uncertainties
4.15 Final results for tt cross section measurement in the fully hadronic nal state
5 Search for associated Higgs boson production together with tt pairs
5.1 Motivation
5.2 Previous results on the search for ttH (H ! b b)
5.3 Background contributions
5.4 Data and MC simulation samples
5.5 The fully hadronic ttH(H ! b b) event topology
5.6 Event Selection
5.7 ttHTopology reconstruction
5.8 QCD multi-jets background estimation: \ABCD » method
5.9 Multivariate (MVA) technique
5.10 Application of \ABCD » method to the ttH (H ! b b) analysis
5.10.1 ttH(H ! b b) validation and discriminant variable distributions
5.11 Systematic uncertainties
5.11.1 Luminosity
5.11.2 Jet energy scale
5.11.3 Jet energy resolution and Jet reconstruction eciency
5.11.4 Heavy avour tagging
5.11.5 ttH modelling
5.11.6 Discussion on QCD multi-jet background systematic
5.12 Conclusion
Conclusions
