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

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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.

 

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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
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

9 Upgrade Studies
157
10 Conclusion
180
A Optimizing Optimizations
183
Bibliography
245
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About the author (2020)

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.

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