Collective Symmetry Breaking as a Solution to the Hierarchy Problem in the 
Standard Model

Max, Kevin

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Collective Symmetry Breaking as a Solution to the Hierarchy Problem in the Standard Model

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Max, Kevin
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Max, K. (2016). Collective Symmetry Breaking as a Solution to the Hierarchy Problem in the Standard Model. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-AFE3-1

Abstract

If the Standard Model is embedded into a more fundamental framework, the electroweak scale is destabilised due to radiative effects quadratically divergent in the embedding scale. In order to reproduce the observed mass of the Higgs boson, one needs to tune several parameters to an extreme accuracy. This is the gauge hierarchy problem of the Standard Model. In this thesis, an approach to solve the hierarchy problem is presented: collective symmetry breaking as implemented in Little Higgs models. The Higgs boson is cast as a naturally light pseudo-Nambu-Goldstone boson of an enlarged global symmetry. The construction and phenomenology of two popular Little Higgs models is demonstrated, and a general guideline for the successful implementation of collective symmetry breaking is discussed. Furthermore, several possible ultraviolet completions to Little Higgs models are presented.