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Dijet resonance searches for dark matter mediators using the ATLAS detector

Corrigan, Eric Edward LU (2021)
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... (More)
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. (Less)
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author
supervisor
opponent
  • Professor Bose, Tulika, University of Wisconsin
organization
publishing date
type
Thesis
publication status
published
subject
keywords
particle physics, dark matter, jets, dijet resonance, ATLAS, LHC, Fysicumarkivet A:2021:Corrigan
pages
241 pages
publisher
Lund University (Media-Tryck)
defense location
Lund University. Join via zoom: https://lu-se.zoom.us/j/61854872462
defense date
2021-06-14 13:15:00
ISBN
978-91-7895-912-9
978-91-7895-911-2
language
English
LU publication?
yes
id
473709c6-d5fe-4f58-85cf-9f8f91db14fc
date added to LUP
2021-05-17 17:06:31
date last changed
2021-07-08 14:08:07
@phdthesis{473709c6-d5fe-4f58-85cf-9f8f91db14fc,
  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. <br/><br/>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.}},
  author       = {{Corrigan, Eric Edward}},
  isbn         = {{978-91-7895-912-9}},
  keywords     = {{particle physics; dark matter; jets; dijet resonance; ATLAS; LHC; Fysicumarkivet A:2021:Corrigan}},
  language     = {{eng}},
  month        = {{05}},
  publisher    = {{Lund University (Media-Tryck)}},
  school       = {{Lund University}},
  title        = {{Dijet resonance searches for dark matter mediators using the ATLAS detector}},
  url          = {{https://lup.lub.lu.se/search/files/97885857/Eric_Corrigan_thesis.pdf}},
  year         = {{2021}},
}