Search for top squarks in compressed scenarios of supersymmetry with the ATLAS experiment / Daniela Börner. Wuppertal, [2018?]
Content
Leere Seite
I Introduction
II The Theory of Particle Physics
The Standard Model
General Introduction
Electroweak Theory
The Higgs Mechanism
Quantum Chromodynamics
Experimental Success of the Standard Model
Limitations of the Standard Model
Supersymmetry
Event Simulation
Simulation of pp Collisions
Factorisation Theorem
Matrix Element
Parton Shower
Matching and Merging
Hadronisation
Underlying Event and Pile-Up
ATLAS Detector Simulation
Statistical Techniques
III The ATLAS Experiment at the Large Hadron Collider
The Large Hadron Collider
The ATLAS Experiment
ATLAS Coordinate System
Inner Detector
Calorimeters
Muon Spectrometer
Magnets
Luminosity Measurement
Trigger System
Data Quality
Event Reconstruction
IV Charged-particle Measurements
Introduction
Event Selection
Data and Monte Carlo Samples
Event Selection
Background Estimation
Trigger and Vertex Reconstruction Efficiency
Track Reconstruction Efficiency
Correction Procedure
Results and Outlook
V Search for Supersymmetry
Introduction
Common Analysis Strategy
Data and Simulated Samples
Preselection
Variables Separating between Signal and Background
Systematic Uncertainties
Intermediate Top Squark Masses
Optimisation Algorithm
tN_med Signal Region
Background Estimation
Impact of Systematic Uncertainties
Results
Compressed Region
Analysis Strategy
Training of the BDT
Background Estimation
Validation
Impact of Systematic Uncertainties
Fit Setup
Results
Comparison of the Full Result
VI Conclusion
Appendix
Monitoring for the IBL Detector
Charged-particle Measurements
Search for Supersymmetry
Preselection Plots for tN_med
Control Region Plots for tN_med
Validation Region Plots for tN_med
Modelling in the tN_med Signal Region
Combination of tN_med and the bCsoft Selections
Preselection Plots for the Compressed Signal Region
Validation Plots
VR for Discovery Fit Setup
Validation Plots for Low BDT Values
Profile Plots
Correlation Plots for BDT Input Variables
JES Dependence of the BDT Fit
Results for Low Mass BDT
Bibliography
Acknowledgements