H → b¯b decays in associated V H production using data from the ATLAS detector

Friend, Johnny (2024) H → b¯b decays in associated V H production using data from the ATLAS detector. PhD thesis, University of Glasgow.

Abstract

This thesis covers my contribution to the V H(H → b ¯b) analysis conducted using 139 fb−1 of data collected by the ATLAS experiment at the LHC. I primarily focused on the boosted 2-lepton MVA analysis, training on new variables and optimizing hyperparameters and contributing to truth-flavour tagging studies. A set of analysis improvements, including those described in this thesis, improved the observed (expected) significance from 2.6 (3.4) to 4.1 (4.5) standard deviations in the 2-lepton region. My development work on the online trigger tool (TTWeb) is also outlined, including my contribution to preparing TTWeb for the start of Run 3 of the LHC.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Subjects: Q Science > QB Astronomy; Q Science > QC Physics; T Technology > TA Engineering (General). Civil engineering (General)
• Colleges/Schools: College of Science and Engineering > School of Physics and Astronomy
• Supervisor's Name: Robson, Professor Aidan
• Date of Award: 2024
• Depositing User: Theses Team
• Unique ID: glathesis:2024-84731
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 02 Dec 2024 16:01
• Last Modified: 02 Dec 2024 16:07
• Thesis DOI: 10.5525/gla.thesis.84731
• URI: https://theses.gla.ac.uk/id/eprint/84731