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Access Type
WSU Access
Date of Award
January 2024
Degree Type
Dissertation
Degree Name
Ph.D.
Department
Physics and Astronomy
First Advisor
Nausheen Shah
Abstract
In the Standard Model (SM), there is no explanation for the fermion-flavor structureor the observed hierarchy in the fermion masses. We construct a model that provides an explanation for these phenomena. Our model expands the particle content of the SM by introducing a spectrum of vector-like heavy fermions (ψ) of mass Mψ, singlet scalar fields (S), and SU(2) scalar doublets. Both the singlet and the neutral component of the doublet scalars acquire vacuum expectation values (VEVs), s_{i} and v^{q}_{i}, respectively. Additionally, global symmetries are imposed to obtain the required Yukawa interactions and to avoid tree level flavor-changing neutral current (FCNC) interactions. The vector-like heavy fermions act as messengers between different generations. In combination with the singlet scalar fields, they allow effective interactions between the left-handed and right-handed SM fermion fields of different generations. The scalar doublets couple to fermions with order-one Yukawa coupling and acquire VEVs of the order of the observed fermion masses. We derive a relationship between the Cabibbo-Kobayashi-Maskawa matrix (CKM) elements, singlet VEVs, and VLQ masses to generate the hierarchy between the CKM matrix elements. We find the singlet VEVs by constraining the Z boson interactions. In future work, we will extend our model to the lepton sector using the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix and investigate the phenomenology of the extended particle spectrum. Furthermore, we will investigate the dynamical origin of different Higgs VEVs by embedding them in multiple warped extra dimensions and construct a UV-complete model that may solve the dark matter problem and the matter-antimatter asymmetry of the universe.
Recommended Citation
Jayawardana, Suneth, "Analyzing Flavor Deconstruction Within The Privately Governed Higgs Sector" (2024). Wayne State University Dissertations. 3994.
https://digitalcommons.wayne.edu/oa_dissertations/3994
