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Search for a heavy scalar Boson in the 2 Higgs doublet model with the ATLAS detector / von Gunar Ernis. Wuppertal, 2. Oktober 2015
Inhalt
Contents
Introduction
Theoretical Background
The Standard Model of Particle Physics
Symmetries and Gauge Theories
The Brout-Englert-Higgs Mechanism
Higgs-Boson Production and Decay Modes in the Standard Model
Properties of the Higgs Boson in the Standard Model
The 2-Higgs-Doublet Model
Higgs-Boson Production and Decay Modes in the 2HDM
Constraints on the 2HDM phase space
The LHC and the ATLAS Experiment
The Large Hadron Collider
The ATLAS Experiment
Inner Detector
Calorimetry
Muon Spectrometer
Forward Detectors
Trigger System
Performance of the ATLAS Experiment
Object Definitions and Data Sets
Reconstruction and Object Definitions
Tracks and Vertices
Electron Candidates
Jet Candidates
Muon Candidates
Missing Transverse Momentum
The 2012 Data Set
Process Description and Event Generation
Signal and Background processes
Diboson Background
Top-Quark Background
Drell-Yan and Jets Associated W Boson Production Background
Monte Carlo Event Generation
Monte Carlo Generators
Subtleties of High Mass Signal Samples
Jets Associated W Boson Production
Process Features and Event Selection
Features of the Signal
Event Selection
Preselection
Selection
Control Regions
Light-Higgs-Boson Control Region
Top-Quark Control Region
Modelling of the Variables
Signal and Background Discrimination
Functionality of Neural Networks
Preprocessing of Variables
Training of Neural Networks
Setup of the Networks
Choice of Input Variables
Modelling of the Input Variables
Neural Network related Cuts
Neural Network Output
Systematic Uncertainties
Jet Modelling Uncertainties
Lepton Modelling Uncertainties
Missing Transverse Momentum Modelling Uncertainties
Migration, Diboson Off-Shell Effect and Luminosity Uncertainties
Cross-Section Uncertainties
Statistical Methods
The Likelihood Function
Hypothesis Tests
Calculation of Cross-Section Limits
Incorporation of Systematic Uncertainties
Results
Exclusion Limits for the Standard Model-like Scenario
Exclusion Limits for the 2-Higgs-Doublet Model Scenarios
Conclusion
Bibliography
Ranking of Variables in Neural Network Training
Separation of Signal and Background Events in the Neural Networks
Danksagung