Subject Area

Physics

Abstract

As a way to test the Standard Model of Physics, the couplings of the Higgs boson to other particles is studied by measuring the production cross-sections of the Higgs boson using the ATLAS detector at the Large Hadron Collider. The cross-sections are measured in the \HZZ  decay channel, where $\ell = e, \mu$. Two sets of measurements were performed on increasing amounts of data collected from proton-proton collisions and a center-of-mass energy of 13.6 TeV. The first set of measurements was collected between 2022 and 2023 corresponding to an integrated luminosity of 56 fb$^{-1}$ while the second set adds data collected in 2024 for a total integrated luminosity of 164 fb$^{-1}$. The cross-section of Higgs boson production is measured to be 1.42 $\pm$ 0.16 pb, which is in good agreement with the Standard Model prediction of 1.44 $\pm$ 0.08 pb. The production mode cross-sections measured were gluon-gluon fusion, vector boson fusion, vector boson associated, and top associated productions. These were measured at a cross-section of $1.11 \pm 0.16$ pb, $140 \pm 50$ fb, $130^{+69}_{-52}$ fb, and $12^{+23}_{-16}$ fb, respectively. The production mode cross-sections were also measured differentially in the Simplified Template Cross-Section framework, allowing for further testing of the Standard Model in specific regions of phase space. The measurements are also interpreted in the $\kappa$-framework to probe for Beyond Standard Model effects while still maintaining model independence. Across all measurements and interpretations, no statistically significant deviations from the Standard Model were found.

Degree Date

Spring 5-14-2026

Document Type

Dissertation

Degree Name

Ph.D.

Department

Physics

Advisor

Ryszard Stroynowski

Second Advisor

Allison Deiana

Third Advisor

Thomas Coan

Fourth Advisor

Haider Abidi

Number of Pages

206

Format

.pdf

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

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