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Table of contents
1 The Standard Model and Beyond
1.1 The Standard Model
1.1.1 Gauge invariance and interactions
1.1.2 Quantum Chromodynamics
1.1.3 Higgs physics and Symmetry breaking
1.1.4 Fermions and Glashow-Weinberg-Salam (GWS) theory
1.1.5 Elementary particles
1.2 Beyond Standard Model (BSM)
1.2.1 Introduction
1.2.2 Minimal Supersymmetric Standard Model (MSSM)
1.2.3 Super particles
1.2.4 Cross-sections and phase space of SUSY models
2 The Large Hadron Collider and the ATLAS detector
2.1 Introduction
2.2 The LHC and Beam
2.3 ATLAS Structure and Physics Requirements
2.3.1 Introduction
2.3.2 Inner detector
2.3.3 Calorimeter
2.3.4 Muon detector
2.3.5 Magnetic system
2.3.6 Forward detector
2.4 Trigger system
3 Object Reconstruction
3.1 Reconstruction of Electrons
3.1.1 Calorimeter-seeded reconstruction and identification
3.1.2 Electron identification within largeregion
3.2 Reconstruction of Muons
3.2.1 Categories of reconstructed muons
3.2.2 Standalone muon performance
3.2.3 Combined muon performance
3.2.4 Tagging muon performance
3.3 Reconstruction of Taus
3.3.1 Tracking and vertexing
3.3.2 Calorimeter-based algorithm for oine reconstruction
3.4 Reconstruction of Jets
3.4.1 Jet reconstruction procedure
3.4.2 Anti-kT algorithm
3.4.3 Jet cleaning and Calibration
3.4.4 Performance of jet reconstruction
3.5 Reconstruction of Missing Transverse Energy
3.5.1 The algorithms for Emiss
3.6 Conclusions
4 Track counting uncertainty for hadronic tau decays
4.1 Introduction
4.2 Data/MC samples and comparison
4.2.1 Data/MC samples
4.2.2 Discrepancy check
4.3 Average number of tracks
4.4 Uncertainty of track counting
4.5 Pileup density
5 Search for supersymmetry in final states with two opposite-sign taus
5.1 Introduction
5.2 Signal Monte Carlo Samples
5.2.1 The Simplified Models
5.2.2 The pMSSM model for direct electro-weakino production
5.2.3 Direct Stau Production
5.3 Object selection
5.3.1 Jets
5.3.2 Taus
5.3.3 Electrons
5.3.4 Muons
5.3.5 MET
5.4 Cut-based Analysis
5.4.1 Signal regions optimization and definition
5.4.2 Background Estimation
5.4.3 Results for cut-based analysis
5.4.4 Summary for cut-based analysis
5.5 MVA for the Direct Stau Production
5.5.1 MVA
5.5.2 Discriminating variable and training
5.5.3 BDT response and SR definition
5.5.4 Results and uncertainty
6 Search for supersymmetry in final states with jets and two same-sign leptons or three leptons
6.1 Introduction
6.2 SS2l/3l SUSY scenarios
6.2.1 Gluino pair production with stop-mediated decay
6.2.2 GG2step
6.2.3 Direct sbottom
6.3 Object selection
6.3.1 Jets
6.3.2 Electrons
6.3.3 Muons
6.3.4 Missing transverse energy
6.4 Event selection
6.5 Signal regions optimization and definition
6.6 Background Estimation
6.6.1 Background Estimation – fake leptons
6.6.2 Background with prompt leptons
6.6.3 Background with charge-flipped electrons
6.7 Validation regions
6.8 Results and Interpretation
7 Conclusion
