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Application of novel analysis workflows in an ATLAS search for supersymmetry / Martin V.F. Errenst. Wuppertal, 10.03.2021
Content
Abstract
Acknowledgements
Contents
I Introduction
1 Theory
1.1 Standard Model
1.2 Proton-Proton Collisions
1.3 Interactions of Particles with Matter
2 The ATLAS Experiment at the LHC
2.1 Coordinate System
2.2 Detector and Trigger Systems
3 Event Reconstruction
3.1 Track and Vertex Reconstruction
3.2 Electron Reconstruction
3.2.1 Reconstruction
3.2.2 Identification
3.2.3 Isolation
3.2.4 Charge Identification
3.2.5 Calibration
3.3 Muon Reconstruction
3.4 Jet Reconstruction and b-Tagging
3.4.1 Jet Reconstruction
3.4.2 Flavour Tagging
3.5 Missing Transverse Momentum
4 Data Formats and Processing in ATLAS
4.1 Overview
4.2 Analysis Model in Run 2
4.3 Derived Analysis Formats
4.4 Analysis Model in Future Runs
II RPV1L Analysis
5 Supersymmetry
5.1 Minimal Supersymmetric Standard Model
5.2 R-Parity
5.3 Search for Supersymmetry at the LHC
6 Analysis Overview
6.1 Signals
6.2 Object Definition
6.3 Background Strategy
7 Background from Misidentified Leptons in QCD Multi-jet Events
7.1 Matrix Method
7.2 Trigger Selection and Efficiency Correction
7.3 mT Normalization
7.4 QCD Enhancing Cuts
7.5 Estimating Fake Electrons
7.6 Estimating Fake Muons
8 Results of the RPV1L Analysis
III Combined Performance Algorithms
9 Overview of CP Algorithms
9.1 Infrastructure
9.2 Centrally Provided CP Algorithms
9.3 Workflow Example: Muon Sequence
10 Reproducing RPV1L N-Tuples with CP Algorithms
10.1 Technical Setup
10.2 Object Definitions
10.2.1 Jet and b-Jet Definition
10.2.2 Electron and Muon Definition
10.2.3 Overlap Removal in CP Algorithms
10.2.4 Missing Transverse Momentum
10.2.5 Systematic Variations
10.3 N-Tuple Comparison
11 Performance Analysis
11.1 Initial Performance Evaluation
11.1.1 Performance Snapshot
11.1.2 Hotspot Analysis
11.1.3 Hotspot Analysis with GetScaleFactors Fix
11.2 Deep Copies of Containers
11.3 Preselection in CP Algorithms
11.4 Systematic Variations
11.4.1 Scaling
11.4.2 Weight-Affecting Variations
11.4.3 Kinematics-Affecting Variations
11.5 TrigDecisionTool Improvement
11.6 Summary of the Performance Analysis
IV Conclusion
Bibliography
Declaration