Abstract
We study the impact of Run 2 LHC data on general composite Higgs scenarios, where nonlinear effects, mixing with additional scalars, and new fermionic degrees of freedom could simultaneously contribute to the modification of Higgs properties. We obtain new experimental limits on the scale of compositeness, the mixing with singlets and doublets with the Higgs, and the mass and mixing angle of top-partners. We also show that for scenarios where new fermionic degrees of freedom are involved in electroweak symmetry breaking, there is an interesting interplay among Higgs coupling measurements, boosted Higgs properties, SMEFT global analyses, and direct searches for single and double production of vector-like quarks.
Highlights
The true origin of the Higgs mechanism is still an open question in Particle Physics, despite the discovery of its key element, the Higgs particle [1, 2], and the observation of the SM-like nature of its couplings to massive particles [3].The main reason to doubt a purely SM Higgs sector can be traced back its quantum behaviour, a problem often expressed in the context of naturalness: how can a fundamental scalar be so light, yet so sensitive to UV effects
Speaking, a composite Higgs scenario leading to one single doublet at low energies is minimal but not typical, and one should consider the effect of more scalars involved in electroweak symmetry breaking (EWSB)
We have studied the impact of the LHC Run 2 measurements on general composite Higgs scenarios
Summary
The true origin of the Higgs mechanism is still an open question in Particle Physics, despite the discovery of its key element, the Higgs particle [1, 2], and the observation of the SM-like nature of its couplings to massive particles [3]. The main reason to doubt a purely SM Higgs sector can be traced back its quantum behaviour, a problem often expressed in the context of naturalness: how can a fundamental scalar be so light, yet so sensitive to UV effects This is not the only suspicious aspect of the SM Higgs. In these sections, we examine the impact that Higgs measurements and direct top-partner searches have on these patterns and in combinations of them, e.g., how nonlinearities and mixing with new scalars do contribute on the same direction to reduce Higgs couplings to massive particles.
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