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Table of contents
Introduction
1 The Standard Model and the Higgs boson
1.1 The Standard Model
1.1.1 The elementary constituents of matter
1.1.2 The fundamental forces
1.2 The Quantum Electrodynamics Field Theory
1.3 The Quantum Chromodynamics Field Theory
1.4 The Electroweak Sector
1.5 The Higgs Mechanism
1.5.1 The Scalar Higgs Field
1.5.2 Mass Generation for the Standard Model Particles
1.6 Higgs Searches
1.6.1 Theoretical Constraints
1.6.2 Experimental Constraints
1.7 Conclusion
2 The Tevatron and the D0 Detector
2.1 The Chain of Accelerators and the Tevatron
2.1.1 Proton Beam Production
2.1.2 The Main Injector and Recycler
2.1.3 Antiproton Beam Production
2.1.4 The Tevatron
2.2 The D0 Detector
2.2.1 Coordinate System
2.2.2 Tracking and Vertexing System
2.2.3 Preshower Detectors
2.2.4 Calorimeter
2.2.5 Muon System
2.2.6 Luminosity Monitor
2.2.7 Trigger and Data Acquisition System
2.2.8 Data Format and Detector Simulation
3 Reconstruction and Identification of Leptons, Jets, and 6ET
3.1 Tracks
3.2 Leptons
3.2.1 Electron
3.2.2 Muon
3.3 Primary Vertex
3.4 Jets
3.4.1 Jet Reconstruction
3.4.2 Jet Identification and Vertex Confirmation
3.4.3 Jet Energy Scale
3.4.4 Jet Shifting, Smearing and Removal
3.4.5 Summary of the Jet Stratety
3.5 Missing Transverse Energy
4 Tagging of b-quark Jets
4.1 b-jets Properties
4.2 b Jet Identification Algorithm Prerequisites
4.2.1 Taggability
4.2.2 V 0 rejection
4.3 b-jet Identification Algorithms
4.4 MVAbl Algorithm
4.4.1 MVAbl Efficiency
5 Monte Carlo Used in the WH Analysis and Event Preselection
5.1 Overview
5.2 Foreword on the Analysis Work Flow
5.3 Data and Monte Carlo used in the WH analysis
5.3.1 Data Samples
5.3.2 Monte Carlo Samples and Generators
5.3.3 Event Trigger
5.4 Event Preselection
5.4.1 Primary Vertex Selection
5.4.2 Lepton Selection
5.4.3 Missing ET Selection
5.4.4 Jet Selection
5.4.5 Triangular Cut
5.4.6 Vetoes
6 Treatment of the Background and Result of Event Selection
6.1 Reweighting of W+jets and Z+jets Samples
6.2 Multijet Background
6.2.1 Multijet Background Modeling Strategy
6.2.2 Lepton Fake Rates
6.3 Multijet and V+jet background normalization
6.4 b-tagging
6.4.1 Taggability
6.4.2 b-tagging MC Corrections
6.4.3 b-tagged Event Distributions
6.5 Event Selection Result
7 Multivariate Signal Discriminants and Validation Through Diboson
7.1 Boosted Decision Trees
7.1.1 Variable Selection
7.1.2 Training and Optimization
7.2 Rebinning
7.3 Performance
7.3.1 Multivariate Multijet Discriminators
7.3.2 Final WH → ℓνb¯b MVA Analysis
7.4 WZ and ZZ Production with Z → b¯b
7.4.1 Diboson MVA
7.4.2 Result
8 Systematic Uncertainties
8.1 Jet Energy Scale (JES)
8.2 Jet Resolution (JSSR) and Jet ID (EFF)
8.3 Vertex Confirmed Jet (VCJet)
8.4 Lepton-ID
8.4.1 EM-ID
8.4.2 μ ID
8.5 ALPGEN
8.6 Taggability (TAG)
8.7 B-ID
8.8 Trigger
8.9 QCD
8.10 Cross Section Uncertainties
8.11 Parton Density Functions (PDF)
8.12 Plots for Systematic Variations
9 Results on the Higgs Boson Search
9.1 The CLS Method
9.1.1 Sensitivity Estimator
9.1.2 Handling of Systematic Uncertainties and Profile Likelihood Ratio .
9.1.3 Limit Calculation
9.1.4 Systematic uncertainties : sources and treatment
9.2 Limits Obtained in the WH Analysis
9.3 Combinations
9.3.1 Combined search for the Higgs boson with the D0 experiment
9.3.2 Combined Higgs Boson Results from CDF and D0
10 Summary
