Light custodians and Higgs physics in composite models

By A. Azatov, J. Galloway. 2011

148 citations recorded by the source corpus.

Composite Higgs models involving partial compositeness of Standard Model fermions typically require the introduction of fermionic partners which are relatively light in realistic scenarios. In this paper, we analyze the role of these light custodian fermions in the phenomenology of the composite Higgs models and show that they significantly modify couplings of the Higgs field. We focus on the coupling to gluons in particular, which is of central importance for Higgs production at the LHC. We show that this coupling can be increased as well as decreased depending on the SM fermion embedding in the composite multiplets. We also discuss modification of the Higgs couplings to bottom and top quarks and show that modifications to all these three couplings Hgg, Htt, and Hbb are generically independent parameters.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/978311a45eabf756f09ecb0d2868ac8a41964586

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In Nuclear and High Energy Physics

Citations in the corpus

Composite scalar dark matter (2012, background): “However, in most cases it was found that no enhancement of the Higgs production occurs, but exceptions are possible [23–25].”
Implications of a light Higgs in composite models (2012, unknown): “Following [22] we derive, ghGG = v ∂ ∂φ log detM(φ,ψ) ∣∣∣∣ VEV = 1− 2ξ √ 1− ξ gsGG = v ∂ ∂ψ log detM(φ,ψ) ∣∣∣∣ VEV = √ ξ 1− ξ cot θ, (25) 11”
A pseudoscalar decaying to photon pairs in the early LHC Run 2 data (2015, background): “Notice that differently from the case of the Higgs couplings [57] here the wave function renormalization of the light quarks does not introduce new effects (unless CP is broken).”
Effective Lagrangian for a light Higgs-like scalar (2013, background): “[62] for an interesting exception).”
Reconstructing Higgs boson properties from the LHC and Tevatron data (2012, background): “In this kind of models, the rescaled SM expressions for these rates that we assumed remain valid even when new physics is so large [79–81].”
Interpreting LHC Higgs results from natural new physics perspective (2012, background): “Note that the independence of the Higgs widths of the fine details of the top sector persists in numerous Little Higgs and composite Higgs models [68–70], although it may not hold in more complicated models where the top couples to more than one composite operator [71].”