Search for vector-like partners of the top and bottom quarks with the ATLAS experiment / Jens Roggel. Wuppertal, August 2022
Content
- Introduction
- The Standard Model of Particle Physics
- Particles and interactions in the Standard Model
- Electroweak theory
- The Higgs mechanism
- Quantum chromodynamics
- Probing the Standard Model
- Limitations of the Standard Model
- Vector-like quarks
- Event simulation
- Factorisation theorem
- Hard scattering cross-section
- Parton shower
- Matching and merging
- Hadronisation
- Underlying event and pile-up
- Monte Carlo event generators
- ATLAS detector simulation
- ATLAS Monte Carlo generator validation
- Monte Carlo production
- Monte Carlo validation procedure
- Validation system PAVER
- Validation use cases and results
- Conclusion and outlook
- The ATLAS experiment at the Large Hadron Collider
- Event Reconstruction
- Tracks and primary vertices
- Electrons
- Muons
- Jets
- Flavour tagging
- Missing transverse momentum
- Overlap removal
- Search for vector-like top and bottom partners
- Data and simulated samples
- Basic event selection
- Kinematic top reweighting
- Signal and background separation
- Background estimation
- Systematic uncertainties
- Handling of systematic uncertainties
- Theoretical systematic uncertainties
- Experimental systematic uncertainties
- Statistical techniques
- Results
- Background-only fit results
- Signal-plus-background fits
- Exclusion limits on signal parameters
- Comparison to other VLQ searches
- Outlook
- Study of tt-tW interference handling schemes
- Theoretical concepts
- Simulated samples
- Object definition and analysis selection
- Comparisons in tt bulk region
- Studies in the interference region
- Conclusion
- Conclusion
- ATLAS MC validation - PAVER webpage
- Search for vector-like quarks
- Additional signal and background shape distributions
- NN input variables in the training region
- Additional distributions in the single-top CR and W+jets CR
- Background-only fits
- Post-fit neural network output distributions in the signal regions
- Interference study
- Bibliography
- Acknowledgements