Keywords
Higgs; Electroweak Baryogenesis; Beyond Standard Model; Matter-Anti-Matter Asymmetry; Real Singlet Scalars
Abstract
The matter–antimatter asymmetry and the hierarchy problem related to the Higgs boson mass remain key open questions in high energy physics. Electroweak Baryogenesis offers a solution to the asymmetry by modifying the Higgs sector to allow a strongly first-order phase transition. This work investigates two real singlet scalar extensions of the Standard Model, incorporating novel quartic and triple couplings between the new scalar fields, providing a testable framework for vacuum-induced scalar mixing effects and enhanced multi-Higgs boson production. These interactions modify the scalar self-coupling and can induce resonant enhancements in multi-Higgs boson production processes. The theoretical constraints are derived from perturbative unitarity and vacuum stability, with the identification of benchmark regions of parameter space, consistent with a strong first-order phase transition. The multi-Higgs boson production in this model is highly sensitive to singlet-induced scalar mixing, with a non-zero vacuum expectation value (vev) generating enhanced amplitudes, interference patterns, and free parameter-dependent variations, whereas a zero value vev yields nearly constant, decoupled cross sections across di-, tri-, and quartic-Higgs boson channels. Fractional changes in the extended couplings are strongly driven by vacuum-induced scalar mixing, with non-zero vev activating off-diagonal mass terms and enhancing Higgs–new-scalar interactions, while tends to suppress these effects. Factorized narrow-width triple-Higgs boson cross sections approximations show dramatic enhancement for due to vacuum-induced scalar mixing, while a vev = 0 suppresses contributions, highlighting the critical role of in activating multi-Higgs boson interactions. This resulting framework provides distinctive, testable signatures of modified Higgs dynamics that can be probed at future colliders.
Thesis Completion Year
2025
Thesis Completion Semester
Fall
Thesis Chair
Efthimiou, Costas
College
College of Sciences
Department
Physics
Thesis Discipline
Physics
Language
English
Access Status
Open Access
Length of Campus Access
None
Campus Location
Orlando (Main) Campus
STARS Citation
Smith, Corine M., "Exploring Electroweak Baryogenesis Within Real Scalar Models: Theoretical Foundations And Collider Phenomenology" (2025). Honors Undergraduate Theses. 463.
https://stars.library.ucf.edu/hut2024/463
Rights Statement
