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Softened Symmetry Breaking in Composite Higgs Models.

Simone Blasi1, Florian Goertz1

  • 1Max-Planck-Institut für Kernphysik Saupfercheckweg 1, 69117 Heidelberg, Germany.

Physical Review Letters
|December 24, 2019
PubMed
Summary

We introduce a novel method to break Goldstone symmetry in composite Higgs models. This approach explains the light Higgs boson and heavy top quark observed at the LHC, avoiding the need for elusive light top partners.

Area of Science:

  • High Energy Physics
  • Particle Physics
  • Theoretical Physics

Background:

  • Composite Higgs models provide an alternative to the Standard Model Higgs mechanism.
  • Explaining the mass of the top quark and the lightness of the Higgs boson are key challenges.
  • Existing models often require light top partners, which have not been observed at the Large Hadron Collider (LHC).

Purpose of the Study:

  • To propose a new mechanism for breaking Goldstone symmetry in composite Higgs models.
  • To reconcile the existence of a light Higgs boson and a heavy top quark with LHC data.
  • To avoid the prediction of light top partners near the compositeness scale.

Main Methods:

  • Restoring global symmetry in elementary-composite fermion mixings by completing elementary fermions to full symmetry representations.

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  • Softly breaking Goldstone symmetry via vectorlike mass terms exclusively in the elementary sector.
  • Analyzing the phenomenological consequences of this new breaking mechanism.

    • Main Results:

    • The proposed mechanism allows for a light Higgs boson, consistent with LHC observations.
    • It naturally accommodates a heavy top quark.
    • The model avoids the necessity of light top partners around the Goldstone scale (f ~ TeV).
    • The standard scenario is recovered in the limit of infinite vectorlike masses.

    Conclusions:

    • This new approach offers a viable solution to the hierarchy problem within composite Higgs models.
    • It successfully explains key experimental observations at the LHC without invoking unobserved particles.
    • The framework provides a pathway to understanding the properties of the Higgs boson and top quark in a composite Higgs scenario.