Exploring fine-tuning of the Next-to-Minimal Composite Higgs Model
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(Published version)
Date
2019
Authors
Murnane, D.
White, M.
Williams, A.G.
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Journal article
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The Journal of High Energy Physics, 2019; 2019(4):076-1-076-26
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Daniel Murnane, Martin White and Anthony G. Williams
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Abstract
We perform a detailed study of the fine-tuning of the two-site, 4D, Next-to-Minimal Composite Higgs Model (NMCHM), based on the global symmetry breaking pattern SO(6) → SO(5). Using our previously-defined fine-tuning measure that correctly combines the effect of multiple sources of fine-tuning, we quantify the fine-tuning that is expected to result from future collider measurements of the Standard Model-like Higgs branching ratios, in addition to null searches for the new resonances in the model. We also perform a detailed comparison with the Minimal Composite Higgs Model, finding that there is in general little difference between the fine-tuning expected in the two scenarios, even after measurements at a high-luminosity, 1 TeV linear collider. Finally, we briefly consider the relationship between fine-tuning and the ability of the extra scalar in the NMCHM model to act as a dark matter candidate, finding that the realisation of a Z₂ symmetry that stabilises the scalar is amongst the most natural solutions in the parameter space, regardless of future collider measurements.
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Open Access, © The Authors. Article funded by SCOAP³.