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Table of contents
Introduction
1 Theoretical introduction
1.1 Introduction to Standard Model of particle physics
1.1.1 Elementary particles and fundamental interactions
1.1.2 The Standard Model and the Brout-Englert-Higgs mechanism
1.2 The Higgs boson
1.2.1 Higgs production in hadron colliders
1.2.2 Higgs decays
1.3 Summary
2 The ATLAS experiment
2.1 The Large Hadron Collider
2.1.1 CERN
2.1.2 The LHC machine
2.2 The ATLAS Detector
2.2.1 The Inner Detector
2.2.2 The calorimeters
2.2.3 The muon spectrometer
2.3 The trigger system
2.4 Data processing
2.5 Event reconstruction
2.5.1 Charged particle tracks and primary vertex
2.5.2 Jet reconstruction
2.5.3 Muon reconstruction
2.5.4 Electron identification
2.5.5 Missing transverse energy
3 Identification of double b-hadron jets
3.1 Introduction
3.2 Identification of b-jets in ATLAS
3.2.1 b-tagging ingredients
3.2.2 b-tagging algorithms
3.3 Multi Secondary Vertex Finder algorithm
3.4 Simulated samples
3.5 Performance of the Multi Secondary Vertex Finder algorithm
3.5.1 Vertex Purity Fraction in single-b jets
3.5.2 Vertex Purity Fraction in bb-jets
3.6 Development of MultiSVbb taggers
3.6.1 Boosted decision trees
3.6.2 Multivariate analysis
3.7 Performance of the MultiSVbb1 and MultiSVbb2 taggers
3.8 Summary
4 Search for the Higgs boson in the single lepton t¯tH(H ! b¯b) channel
4.1 Status of the t¯tH(H ! b¯b) analysis
4.2 Data and simulation samples
4.2.1 Data
4.2.2 Simulated samples
4.3 Object selection
4.4 Event selection and categorisation
4.5 Multivariate analysis
4.5.1 MVA-based event reconstruction
4.5.2 Discrimination between signal and background
4.6 Background modelling
4.6.1 t¯t + jets background
4.6.2 Misidentified lepton background
4.6.3 Other backgrounds
4.7 Systematic uncertainties
4.7.1 Experimental uncertainties
4.7.2 Uncertainties on the background modelling
4.7.3 Uncertainties on the signal modelling
4.8 Statistical analysis
4.9 Results
4.9.1 Combination with the dilepton analysis
4.10 Summary
5 Conclusion
Bibliography
