Minimal Composite Higgs Models at the LHC

Abstract

We consider composite Higgs models where the Higgs is a pseudo-Nambu Goldstone boson arising from the spontaneous breaking of an approximate global symmetry by some underlying strong dynamics. We focus on the SO(5) -> SO(4) symmetry breaking pattern, assuming the partial compositeness paradigm. We study the consequences on Higgs physics of the fermionic representations produced by the strong dynamics, that mix with the Standard Model (SM) degrees of freedom. We consider models based on the lowest-dimensional representations of SO(5) that allow for the custodial protection of the Z -> b b coupling, i.e. the 5, 10 and 14. We find a generic suppression of the gluon fusion process, while the Higgs branching fractions can be enhanced or suppressed compared to the SM. Interestingly, a precise measurement of the Higgs boson couplings can distinguish between different realizations in the fermionic sector, thus providing crucial information about the nature of the UV dynamics.

55 pages, 18 figures, References added

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Cited by in corpus (17)

• A Systematic Approach to the SILH Lagrangian
• On the Flavor Structure of Natural Composite Higgs Models & Top Flavor Violation
• A naturally light Higgs without light Top Partners
• Modelling vector-like quarks in partial compositeness framework
• LHC signals of the $SO(5)\times U(1)$ gauge-Higgs unification
• The Excitation of the Global Symmetry-Breaking Vacuum in Composite Higgs Models
• The linear-non-linear frontier for the Goldstone Higgs
• Composite Higgs and leptoquarks from a simple group
• Fine Tuning in the Holographic Minimal Composite Higgs Model
• Baryon asymmetry generation in the E6CHM
• Generalised Proper Time as a Unifying Basis for Models with Two Right-Handed Neutrinos
• Constraints on vector resonances from a strong Higgs sector
• The Dynamical Composite Higgs
• A symmetry for ${\epsilon }_K$
• Discovery goals and opportunities in high energy physics: a defense of BSM-oriented exploration over signalism
• Rescaling mechanism and effective symmetry from the ideal cancellation of the $S$ parameter in custodial models
• Vector-like Fermions in a Minimal Composite Higgs Model