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Table of contents
Introduction
1 Phenomenology
1.1 The Gauge Principle
1.2 The Electroweak Unification
1.3 Spontaneous Symmetry Breaking
1.4 The Higgs Mechanism
1.5 Constraints on the Standard Model Higgs Boson Mass
1.6 Higgs Boson Production and Decay
1.7 The H → γγ and H → Zγ Decays
2 The Large Hadron Collider and the ATLAS detector
2.1 The Large Hadron Collider
2.2 The ATLAS Detector
2.3 Photon Reconstruction
2.4 Photon Identification
2.5 Photon Energy Calibration
2.6 Lepton Reconstruction and Identification
2.7 Jet and Missing ET Reconstruction
3 Photon performance
3.1 Photon Trigger Optimization for the 2012 data taking
3.2 Photon Trigger Efficiency Measurement
3.3 Photon Identification Efficiency Measurements
3.4 Pile-up Dependence of the Photon Identification Efficiency
3.5 Summary
4 Search for a Higgs boson in H → Zγ → ℓℓγ
4.1 Introduction
4.2 Data and Simulation Samples
4.3 Event Selection
4.4 Discriminating Variable
4.5 Event Classification
4.6 Data-driven Background Estimation
4.7 Signal Parameterization
4.8 Background Properties
4.9 Systematic Uncertainties
4.10 Statistical Method
4.11 Exclusion Limits and p-values
4.12 Conclusions and Prospects
5 Observation of the Higgs boson in γγ events
5.1 Introduction
5.2 Data and Simulation Samples
5.3 Event Selection and Category
5.4 Data-driven Background Estimation
5.5 Signal and Background Modelling
5.6 Systematic Uncertainties
5.7 Results
5.8 The Higgs Boson Properties Measurements in Combined Channels .
5.9 The Higgs Boson Properties Measurements in H → γγ Channel with the CMS Detector
Conclusion
Bibliography
