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Model Building in the LHC Era: Vector-like Leptons and SUSY GUTs

Poh, Zijie
http://rave.ohiolink.edu/etdc/view?acc_num=osu1502809360161742

Abstract Details

2017, Doctor of Philosophy, Ohio State University, Physics.
In this thesis, we study the phenomenology of some models beyond the Standard Model (SM). First, we analyze a model in which the SM is extended by a family of vector-like (VL) leptons. We find that the strongest constraints are coming from the muon anomalous magnetic moment, the deviation from the SM of Higgs bosons decaying to muons, the deviation from the SM of Higgs bosons decaying to photons, and the branching ratio of muon decaying to electron. Although VL leptons couple to all three families of the SM leptons, electron-VL couplings are highly constrained. The second model that we consider is a three family SO(10) SUSY GUT with Yukawa unification. We perform a global chi-squared analysis and show that SUSY effects do not decouple even though the best fit universal scalar mass parameter at the GUT scale is approximately 25 TeV. The fit to sin(2beta), and up and down quark masses of this model, however, are not great. We show that the fits can be improved by choosing a Pati-Salam (PS) group as the gauge group and modifying the Yukawa sector. The best-fit point, consistent with the bound obtain from reinterpreting gluino simplified model analyses by the ATLAS and CMS collaborations, has gluino mass equals 1.9 TeV and chi-squared per degrees of freedom approximately 1.12. Finally, we study the reheating and the baryogenesis (via leptogenesis) of this PS model extended by an inflation sector. This model reheats via instant preheating due to bosonic and fermionic broad parametric resonances. The lepton asymmetry is obtained from the CP asymmetric right-handed neutrino (RHN) decay. The leptogenesis analysis is performed by including all three families of the RHNs because, by fitting to the low-energy observables, the heaviest RHN decays to produce a lepton asymmetry with the correct sign, while the two lighter RHNs decay to produce the wrong sign.
Stuart Raby (Advisor)
Eric Braaten (Committee Member)
Christopher Hill (Committee Member)
John Beacom (Committee Member)
210 p.
Physics
SUSY GUT; vector-like leptons; leptogenesis

Recommended Citations

Citations

  • Poh, Z. (2017). Model Building in the LHC Era: Vector-like Leptons and SUSY GUTs [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502809360161742

    APA Style (7th edition)

  • Poh, Zijie. Model Building in the LHC Era: Vector-like Leptons and SUSY GUTs. 2017. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1502809360161742.

    MLA Style (8th edition)

  • Poh, Zijie. "Model Building in the LHC Era: Vector-like Leptons and SUSY GUTs." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502809360161742

    Chicago Manual of Style (17th edition)

osu1502809360161742
544
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This open access ETD is published by The Ohio State University and OhioLINK.