The Search for Supersymmetry in Hadronic Final States Using Boosted Object Reconstruction

Giordon Stark

Springer Nature, Mar 13, 2020 - Science - 257 pages

This thesis represents one of the most comprehensive and in-depth studies of the use of Lorentz-boosted hadronic final state systems in the search for signals of Supersymmetry conducted to date at the Large Hadron Collider. A thorough assessment is performed of the observables that provide enhanced sensitivity to new physics signals otherwise hidden under an enormous background of top quark pairs produced by Standard Model processes. This is complemented by an ingenious analysis optimization procedure that allowed for extending the reach of this analysis by hundreds of GeV in mass of these hypothetical new particles. Lastly, the combination of both deep, thoughtful physics analysis with the development of high-speed electronics for identifying and selecting these same objects is not only unique, but also revolutionary. The Global Feature Extraction system that the author played a critical role in bringing to fruition represents the first dedicated hardware device for selecting these Lorentz-boosted hadronic systems in real-time using state-of-the-art processing chips and embedded systems.

Contents

• 1 Introduction: 1
• 2 Standard Model and Beyond: 3
• 3 The Large Hadron Collider and the ATLAS Detector: 27
• 4 Trigger and Data Acquisition: 47
• 5 Event Reconstruction: 66
• 6 Boosted Object Reconstruction: 97
• 7 Search for Massive Supersymmetry at 13TeV: 106
• 8 Results: 145
• 9 Upgrade Studies: 157
• 10 Conclusion: 180
• A Optimizing Optimizations: 183
• B xAODAnaHelpers: 185
• SlowControl and Monitoring: 187
• D N1 Plots: 197
• E ttbar HeavyFlavor ClassificationFlavor Contamination: 204
• F Sample List: 217
• G ModelDependent Limits by Region: 235
• H HEPData Plots: 237
• Glossary: 241
• Bibliography: 245

About the author

Giordon Stark is a postdoctoral researcher at the Santa Cruz Institute for Particle Physics, University of California, Santa Cruz. He received his PhD from the University of Chicago in 2018.

Bibliographic information

• Title: The Search for Supersymmetry in Hadronic Final States Using Boosted Object Reconstruction; Springer Theses
• Author: Giordon Stark
• Publisher: Springer Nature, 2020
• ISBN: 3030345483, 9783030345488
• Length: 257 pages
• Subjects: Computers / Artificial Intelligence / General; Science / Physics / Atomic & Molecular; Science / Physics / General; Science / Physics / Nuclear; Science / Physics / Quantum Theory; Technology & Engineering / Measurement