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Beyond the Standard Model of Particles

Title: Beyond the Standard Model of Particles: Effective Field Theories and Baryogenesis.

Inaccessible until Aug 31, 2021 due to copyright restrictions.

Name(s): Yunesi, Arash, author
Agashe, Amod S. (Amod Sadanand), university representative
Reina, Laura, committee member
Huffenberger, Kevin M., 1977-, committee member
Florida State University, degree granting institution
College of Arts and Sciences, degree granting college
Department of Physics, degree granting department
Type of Resource: text
Genre: Text
Doctoral Thesis
Issuance: monographic
Date Issued: 2019
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (118 pages)
Language(s): English
Abstract/Description: Two big questions in physics beyond the Standard Model of particles are nature of Dark Matter and a theory of Quantum Gravity. In this work, topics related to both of these improtant questions are presented. First, we introduce an effective theory for soft and collinear limits of gravitational scatterings. It is a well-known fact that amplitudes including gravitons are inherently difficult to calculate. Our effective theory in its target phase space, substantially simplifies calculations of scattering amplitudes including gravtions. Our step by step procedure gives all the relevant operators at leading and next to leading powers for any full theory that couples to gravitons. In addition, the soft graviton theorem and decoupling of collinear gravitons at the leading power are manifest from the outset in the effective symmetries of the theory. At the next-to-leading power, certain simple structures of amplitudes, which are completely obscure in Feynman diagrams of the full theory, are also revealed. We will also discuss how ambiguity in choice of light-cone coordinates introduces fundamental redundancies in Soft Collinear Effective Theory (SCET). SCET Lagrangian should be invariant under these transformations of coordinates, and the constraints from these transformations further reduce calculations needed for a scattering process. Second, thermal freeze-out of WIMPs can provide a unified origin of dark matter and baryon abundances in our universe. We show that this mechanism exhibits rich collider phenomenology. The collider signatures we point out can be tested at the current and future experiments at the LHC, even if the WIMPs are not charged under Standard Model and higgs interactions. In particular, the simplest such implementation can already offer a very clean signal of a TeV-scale resonance that decays to diphotons with a cross section that can easily be within the reach of the current and near-future LHC runs in the region of parameter space that leads to a successful baryogenesis. Other characteristic signatures include the production of multi-bottom and/or multi-top quarks, promptly or displaced. An even more exotic possibility is the production of two separate sets of isolated emerging jets connected by a charged track, which may require new dedicated studies. Finally, di-nucleon decay can also provide a powerful probe of the mechanism.
Identifier: 2019_Summer_Yunesi_fsu_0071E_15396 (IID)
Submitted Note: A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester 2019.
Date of Defense: July 12, 2019.
Keywords: Baryogenesis, Beyond Standard Model, Effective Field Theory, Gravity
Bibliography Note: Includes bibliographical references.
Advisory Committee: Takemichi Okui, Professor Directing Dissertation; Amod Agashe, University Representative; Laura Reina, Committee Member; Kevin Huffenberger, Committee Member; Andrew Askew, Committee Member.
Subject(s): Physics
Persistent Link to This Record:
Host Institution: FSU

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Yunesi, A. (2019). Beyond the Standard Model of Particles: Effective Field Theories and Baryogenesis. Retrieved from