In this dissertation we consider a number of topical issues in physics beyond the standard model. Motivated by null results from superpartner searches and the tentative Higgs boson signal at mh ≈ 125 GeV, we consider the framework of focus point supersymmetry. Within the focus point framework we examine models in which the neutralino is a thermal relic which saturates the observed dark matter relic density, and generalize the results for dark matter direct detection to generic models with heavy scalars. We also extend the original focus point framework to the case of non-zero A-terms, allowing models in which m h ≈ 125 GeV can be achieved with only 1% fine-tuning in the weak scale. We also consider formal aspects of anomaly-mediated supersymmetry breaking, in particular a recent derivation of anomaly-mediated soft masses using the full supergravity framework and its relation to the original derivation. Finally, we examine models in which recent contradictory results from light dark matter experiments can be partially explained by relaxing the common assumption of equal couplings to protons and neutrons.
|Advisor:||Feng, Jonathan L.|
|Commitee:||Rajaraman, Arvind, Shirman, Yuri|
|School:||University of California, Irvine|
|Department:||Physics - Ph.D.|
|School Location:||United States -- California|
|Source:||DAI-B 73/11(E), Dissertation Abstracts International|
|Subjects:||Theoretical physics, Particle physics|
|Keywords:||Anomaly mediation, Dark matter, Higgs boson, Isospin violation, Supersymmetry|
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