Electroweak Physics at the Large Hadron Collider with the ATLAS Detector

1. Front Matter

   Pages i-xxiii

   PDF

2. Introduction

   • Elodie Resseguie

   Pages 1-2

3. Theoretical Framework

   • Elodie Resseguie

   Pages 3-33

4. LHC and the ATLAS Detector

   • Elodie Resseguie

   Pages 35-53

5. HL-LHC Inner Detector Upgrade

   • Elodie Resseguie

   Pages 55-85

6. \(W^\pm Z\) Cross-Section Measurement at \(\sqrt{s} = 13\) TeV

   • Elodie Resseguie

   Pages 87-119

7. Searches for Electroweak SUSY: Motivation and Models

   • Elodie Resseguie

   Pages 121-129

8. Search for Wino-Bino Production Decaying via WZ at \(\sqrt{s}=13\) TeV

   • Elodie Resseguie

   Pages 131-173

9. Studying the Excess in the Recursive Jigsaw Reconstruction (RJR) Search Using the Emulated RJR (eRJR) Technique

   • Elodie Resseguie

   Pages 175-204

10. Search for Wino-Bino Production Using the Emulated Recursive Jigsaw Reconstruction Technique with Run 2 Data

    • Elodie Resseguie

    Pages 205-255

11. Search for the EWK Production of Compressed SUSY with Soft Leptons

    • Elodie Resseguie

    Pages 257-294

12. Future Work: Search for Compressed Wino-Bino Production in the Three Lepton Final State

    • Elodie Resseguie

    Pages 295-310

13. Conclusion

    • Elodie Resseguie

    Pages 311-313

14. Back Matter

    Pages 315-322

    PDF

This thesis discusses searches for electroweakly produced supersymmetric partners of the gauge and the Higgs bosons (gauginos and higgsinos) decaying to multiple leptons, using pp collisions at sqrt(s) = 13 TeV. The thesis presents an in-depth study of multiple searches, as well as the first 13 TeV cross section measurement for the dominant background in these searches, WZ production. Two searches were performed using 36.1/fb of data: the gaugino search, which makes use of a novel kinematic variable, and the higgsino search, which produced the first higgsino limits at the LHC. A search using 139/fb of data makes use of a new technique developed in this thesis to cross check an excess of data above the background expectation in a search using a Recursive Jigsaw Reconstruction technique. None of the searches showed a significant excess of data, and limits were expanded with respect to previous results.
These searches will benefit from the addition of luminosity during HL-LHC; however, the current detector will not be able to withstand the increase in radiation. Electronics for the detector upgrade are tested and irradiated to ensure their performance.

• ATLAS Detector
• gauginos and higgsinos
• Supersymmetric partners of Higgs and gauge bosons
• Electroweak Supersymmetry
• HL-LHC
• Detector electronics under radiation
• recursive jigsaw reconstruction

• Physics Department, Lawrence Berkeley National Laboratory, Berkeley, USA

  Elodie Resseguie

Elodie received a B.S. in electrical engineering, with a minor in physics, from the University of California, Davis in 2014, and a Ph.D. in physics from the University of Pennsylvania in 2019. Elodie is currently a Chamberlain postdoctoral fellow at Lawrence Berkeley National Laboratory working on the ATLAS experiment.  

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