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Existing models of dynamical electroweak symmetry breaking (EWSB) find itvery difficult to get a Higgs of mass lighter than $m_t$. Consequently, inlight of the LHC discovery of the ~125 GeV Higgs, such models face asignificant obstacle. Moreover, with three generations those models have asuperheavy cut-off around $10^{17}$ GeV, requiring a significant fine-tuning.To overcome these twin difficulties, we propose a hybrid framework for EWSB, inwhich the Higgs mechanism is combined with a Nambu-Jona-Lasinio mechanism. Themodel introduces a strongly coupled doublet of heavy quarks with a mass around500 GeV, which forms a condensate at a compositeness scale $\Lambda$ about afew TeV, and an additional unconstrained scalar doublet which behaves as a"fundamental" doublet at $\Lambda$. This "fundamental"-like doublet has avanishing quartic term at $\Lambda$ and is, therefore, not the SM doublet, butshould rather be viewed as a pseudo-Goldstone boson of the underlying strongdynamics. This setup is matched at the compositeness scale $\Lambda$ to atightly constrained hybrid two Higgs doublet model, where both the compositeand unconstrained scalars participate in EWSB. This allows us to get a goodcandidate for the recently observed 125 GeV scalar which has properties verysimilar to the Standard Model Higgs. The heavier (mostly composite) CP-evenscalar has a mass around 500 GeV, while the pseudoscalar and the charged Higgsparticles have masses in the range 200 -300 GeV.

Hybrid dynamical electroweak symmetry breaking with heavy quarks and the 125 GeV Higgs