Dijet resonance searches for dark matter mediators using the ATLAS detector

Eric Edward Corrigan

Research output: ThesisDoctoral Thesis (monograph)

421 Downloads (Pure)

Abstract

Dark matter is abundant in the universe, yet its composition and nature are unknown. If dark matter consists of new particles with nonzero interactions with Standard Model particles, it could be produced and detected or inferred by collider experiments. This thesis describes searches for dark matter models with new spin-1 force mediators coupling dark matter to quarks, using the ATLAS detector at the LHC. The studies target processes where a mediator is resonantly produced and decays back into two quarks, leaving two collimated jets of particles in the detector, and use $\sqrt{s} = 13 \TeV$ data recorded by ATLAS between 2015 and 2017. No evidence for new physics was seen, and exclusion limits were set on benchmark models. Additionally, we describe how such limits can be reinterpreted in the contexts of other models to provide further constraints.

In order to conduct these searches, well-calibrated jets are needed, as well as good understanding of detector performance. This thesis also describes several tools and studies aimed at improving the jet physics performance of ATLAS. In particular, methods for studying the jet energy calibration and resolution are presented.
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Particle Physics
Supervisors/Advisors
  • Doglioni, Caterina, Supervisor
  • Åkesson, Torsten, Assistant supervisor
  • Lönnblad, Leif, Assistant supervisor
Thesis sponsors
Award date2021 Jun 14
Place of PublicationLund
Publisher
ISBN (Print)978-91-7895-911-2
ISBN (electronic) 978-91-7895-912-9
Publication statusPublished - 2021 May 17

Bibliographical note

Defence details
Date: 2021-06-14
Time: 13:15
Place: Lund University. Join via zoom: https://lu-se.zoom.us/j/61854872462
External reviewer(s)
Name: Bose, Tulika
Title: Professor
Affiliation: University of Wisconsin
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Subject classification (UKÄ)

  • Subatomic Physics

Keywords

  • particle physics
  • dark matter
  • jets
  • dijet resonance
  • ATLAS
  • LHC
  • Fysicumarkivet A:2021:Corrigan

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