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Elementary Higgs, pseudo-Goldstone or dilaton?

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The absence of a light Higgs boson is often considered the main feature of dynamical Electroweak Symmetry Breaking (EWSB). However it is conceivable, and perhaps preferable, to consider the situation where a new strong interaction underlies EWSB and yet there exists a light scalar resonance with couplings qualitatively similar to those of the Standard Model Higgs. One can think of two such examples, in one case the light scalar is a pseudo-Goldstone composite Higgs while in the other it is a naturally light dilaton. I will show that, in both cases, the deviations from the Standard Model are tightly constrained by the relevant non-linearly realized approximate symmetries. I will discuss the relevant observables to distinguish them.

This talk is part of the Theoretical Physics Colloquium series.

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