Publication Date

2022

Document Type

Dissertation/Thesis

First Advisor

Adelman, Jahred A.

Degree Name

Ph.D. (Doctor of Philosophy)

Legacy Department

Department of Physics

Abstract

In this dissertation, two important measurements are presented related to diphoton production, the differential cross-section measurement of the Higgs boson in the diphoton decay channel as well as a measurement on inclusive diphoton production with associated heavy-flavor jets. Selections between the two analyses are complimentary, making them a natural pairing in the context of this dissertation. The cross-section measurement is performed in a fiducial region of phase space to closely matches experimental selections. This allows for a largely model-independent measurement, providing a meticulous test of the Standard Model as well as other theoretical predictions. The production of diphoton + heavy-flavor jets has never before been measured and initial sensitivity estimates are presented here. This measurement is important as a probe of quantum chromodynamics due to the heavy-flavor jet production, but also as a contributor to other analyses' backgrounds that probe Higgs boson properties. The results presented here were obtained using proton-proton collision data collected by the ATLAS detector using the full Run 2 dataset with a center-of-mass energy of $\sqrt{s} = 13$~TeV at the Large Hadron Collider.

Extent

383 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

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