Abstract
We investigate induced electroweak symmetry breaking (EWSB) in models in which the Higgs is a pseudo-Nambu-Goldstone boson (pNGB). In pNGB Higgs models, Higgs properties and precision electroweak measurements imply a hierarchy between the EWSB and global symmetry-breaking scales, v H ≪ f H . When the pNGB potential is generated radiatively, this hierarchy requires fine-tuning to a degree of at least ∼ v 2 h /f 2 H . We show that if Higgs EWSB is induced by a tadpole arising from an auxiliary sector at scale f Σ ≪ v H , this tuning is significantly ameliorated or can even be removed. We present explicit examples both in Composite Higgs models based on SO(5)/SO(4) and in Twin Higgs models. For the Twin case, the result is a fully natural model with f H ∼ 1 TeV and the lightest colored top partners at 2 TeV. These models also have an appealing mechanism to generate the scales of the auxiliary sector and Higgs EWSB directly from the scale f H , with a natural hierarchy f Σ ≪ v H ≪ f H ∼ TeV. The framework predicts modified Higgs coupling as well as new Higgs and vector states at LHC13.
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Harnik, R., Howe, K. & Kearney, J. Tadpole-induced electroweak symmetry breaking and pNGB Higgs models. J. High Energ. Phys. 2017, 111 (2017). https://doi.org/10.1007/JHEP03(2017)111
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DOI: https://doi.org/10.1007/JHEP03(2017)111