The hierarchy problem of the Standard Model and its solutions

Author(s)

Gabriel Massoni Salla

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2020-09-02

Examining board members

Enrico Bertuzzo; Ricardo D'Elia Matheus; Rogério Rosenfeld

• Advisor: Enrico Bertuzzo

Abstract

In this thesis the Hierarchy Problem of particle physics is studied, in particular both its formulation and some of its solutions, namely Supersymmetry, Composite Higgs models, Twin Higgs models and Cosmological Relaxation models. In the first part the Hierarchy Problem is defined as two different problems: the Scalar Mass Problem and the Hierarchy Paradigm, which are related to the inconsistencies within the Effective Field Theory framework and the concept of naturalness, respectively. A review of each of the aforementioned solutions is presented by developing their basic theoretical formulation, focusing on how they solve the Hierarchy Problem, and their minimal implementation. Furthermore, recent experimental bounds of the corresponding minimal models are discussed. On top of this, a novel model-independent approach to Cosmological Relaxation models based on effective theories is developed. Finally, the characterisation of each model in terms of the Scalar Mass Problem and the Hierarchy Paradigm is obtained. (AU)

• FAPESP's process: 18/23679-2 - Physics beyond the standard model: theoretical and phenomenological challenges: composite Higgs models and their UV completions
• Grantee: Gabriel Massoni Salla
• Support Opportunities: Scholarships in Brazil - Master