Collider constraints on the phenomenological MSSM with neutralino and gravitino lightest supersymmetric particles

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As the Large Hadron Collider (LHC) begins Run II collisions at an unprecedented 13 TeV center-of-mass collision energy, it is important to take stock of the lessons learned from the Higgs discovery and the null results from searches for new physics, and also to understand how the LHC fits within the framework of rapid progress in flavor physics, dark matter detection, and cosmology. In this Thesis, I describe a numerical study of phenomenological MSSM (pMSSM) models, considering models with either of the two viable choices (a neutralino or a gravitino) for the lightest supersymmetric particle (LSP). After considering constraints on these models from flavor physics and early universe cosmology and exploring the relationship between model phenomenology and fine-tuning, I will describe how the viable parameter space is affected by LHC Run I searches, compare our results with simplified model exclusion limits, and describe important cases where the pMSSM results differ from simplified model analyses. I will also highlight cases where the LHC limits are degraded as a result of unusual decay topologies and/or displaced decays, discuss ways to improve the LHC's sensitivity to these scenarios, and show preliminary projections for the anticipated improvement in sensitivity that will result from the increased energy and luminosity in Run II. Finally, I will investigate how precise measurements of the couplings of the Standard Model - like Higgs can provide a complementary approach for exploring the pMSSM parameter space.


Type of resource text
Form electronic; electronic resource; remote
Extent 1 online resource.
Publication date 2015
Issuance monographic
Language English


Associated with Cahill-Rowley, Matthew
Associated with Stanford University, Department of Physics.
Primary advisor Hewett, JoAnne L
Thesis advisor Hewett, JoAnne L
Thesis advisor Peskin, Michael Edward, 1951-
Thesis advisor Rizzo, Thomas, 1972-
Advisor Peskin, Michael Edward, 1951-
Advisor Rizzo, Thomas, 1972-


Genre Theses

Bibliographic information

Statement of responsibility Matthew Cahill-Rowley.
Note Submitted to the Department of Physics.
Thesis Thesis (Ph.D.)--Stanford University, 2015.
Location electronic resource

Access conditions

© 2015 by Matthew William Cahill-Rowley
This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).

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