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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.
