Supersymmetry helps simplifying the hierarchy problem, it provides candidates for dark matter and it leads to the desirable gauge coupling unification. Nevertheless, Supersymmetry is not found around us, and it has to be a broken symmetry. In this thesis we explore a different paradigm where supersymmetry is not broken in the true vacuum. Instead we live in a long living meta-stable vacuum that is not supersymmetric. / text

Thesis (Master)--İzmir Institute of Technology, İzmir, 2006. / Keywords: Flavor violation, flavor violation in supersymmetry, fcnc currents, threshold correction in supersymmetry. Includes bibliographical references (leaves 83-88).

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

Thesis (Ph. D.) -- California Institute of Technology, 2010. / Title from home page (viewed 05/10/10). Advisor and committee chair names found in the thesis' metadata record in the digital repository. Includes bibliographical references.

Thesis (Ph. D.)--University of Hawaii at Manoa, 2002. / Includes bibliographical references (leaves 146-155). Also available on microfiche.

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The dark matter (DM) blind spots in the Minimal Supersymmetric Standard Model (MSSM) refer to the parameter regions where the couplings of the DM particles to the Z-boson or the Higgs boson are almost zero, leading to vanishingly small signals for the DM direct detections. In this paper, we carry out comprehensive analyses for the DM searches under the blind-spot scenarios in MSSM. Guided by the requirement of acceptable DM relic abundance, we explore the complementary coverage for the theory parameters at the LHC, the projection for the future underground DM direct searches, and the indirect searches from the relic DM annihilation into photons and neutrinos. We find that (i) the spin-independent (SI) blind spots may be rescued by the spin-dependent (SD) direct detection in the future underground experiments, and possibly by the indirect DM detections from IceCube and SuperK neutrino experiments; (H) the detection of gamma rays from Fermi-LAT may not reach the desirable sensitivity for searching for the DM blind spot regions; (Hi) the SUSY searches at the LHC will substantially extend the discovery region for the blind-spot parameters. The dark matter blind spots thus may be unblinded with the collective efforts in future DM searches.

Orientador: Maria Cristina Batoni Abdalla Ribeiro / Coorientador: Daniel Luiz Nedel / Banca: Dáfni Fernanda Zenedin Marchioro / Banca: Adilson José da Silva / Banca: Marcus Benghi Pinto / Banca: Olivier Piguet / Resumo: A ação efetiva e o potencial efetivo são objetos fundamentais no estudo de quebra de simetrias. Em teorias de campo supersimétricas, o cálculo destes objetos propicia uma ferramenta para a análise de como a supersimetria é quebrada, e a relação desta quebra com outras simetrias, como a simetria R. Desta forma, o estudo de correções radiativas para a ação efetiva e o potencial efetivo em modelos que realizam a quebra de supersimetria, tal como o modelo de O'Raifeartaigh e suas generalizações, é de extrema importância quando deseja-se estudar o efeito das correções quânticas para o potencial clássico destes modelos e como estas correções modificam suas características clássicas. Desenvolver métodos de somar as contribuições de uma determinada classe de diagramas de Feynman para estes modelos é fundamental para a obtenção de resultados de caráter não perturbativo. Para o estudo de processos supersimétricos, tais métodos de ressoma podem ser desenvolvidos utilizando um formalismo claro, compacto e elegante, que é o formalismo de supercampos. Neste formalismo, os diagramas de Feynman e, assim, as correções radiativas, são calculados utilizando-se as técnicas de cálculo no super-espaço, que reduz drasticamente a quantidade de diagramas a serem calculados em um determinado processo / Abstract: The effective action and the effective potential are fundamental objects in the study of symmetries breaking. In supersymmetric field theories, the calculation of these objects provides a tool for the analysis of how supersymmetry is broken, and the relation of these breaking with other symmetries, such asR symmetry. In this way, the study of radiactive corrections for the effective action and the effective potential in models which accomplish the supersymmetry breaking, such as the O'Raifeartaigh model and its generalizations, is of extreme importance when one wishes to study the effect of quantum corrections for the classical potential of these modelsandhowthese corrections modifyitsclassical features. Developing methods tosumup the contributions of a determined class of Feynman diagrams for these models is fundamental to obtain results of nonperturbative character. For the study of supersymmetric processes, such ressumation methods can be developed using a clear, compact and elegant formalism, known as the superfield formalism. In this formalism, the Feynman diagrams and, henceforth, the radiactive corrections, are calculated using the techniques of superspace calculus, which drastically reduce the amount of diagrams to be calculated in a determined process / Doutor