Bird, Gareth 
ORCID: 0000-0003-2025-5935
(2024).
Commissioning of the Level-I Calorimeter trigger Phase-I upgrade and searches for High-Mass Heavy Neutral Leptons in the ATLAS experiment at the LHC.
University of Birmingham.
Ph.D.
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Bird2024PhD.pdf
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Abstract
The ATLAS experiment is capable of measuring consistent proton collisions at the highest energies to date with \(\sqrt{s}=13.6\) TeV. This allows many previously impossible measurements of standard model physics and searches for new physics.
This thesis is split into two major parts. The phase one upgrade of the level one calorimeter trigger is outlined. This discusses the author's contributions to installation of the eFEX system, allowing the rate of single electron triggers in run 3 to be reduced by 5kHz or about 20% for the same level of performance.
Then an analysis of Heavy Neutral Leptons (HNLs) produced in a t-channel VBS-like topology is outlined. This leads to the first limits on HNL mass-mixing up to masses of 20 TeV alongside the CMS experiment.
| Type of Work: | Thesis (Doctorates > Ph.D.) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Award Type: | Doctorates > Ph.D. | |||||||||
| Supervisor(s): |
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| Licence: | All rights reserved | |||||||||
| College/Faculty: | Colleges > College of Engineering & Physical Sciences | |||||||||
| School or Department: | School of Physics and Astronomy | |||||||||
| Funders: | Science and Technology Facilities Council | |||||||||
| Subjects: | Q Science > QC Physics | |||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/14850 |
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