2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/222908Vector-like quarks are a common feature of "composite" Higgs models, where they intervene in cutting off the top-loop contribution to the Higgs boson mass and may, at the same time, affect the Electroweak Precision Tests (EWPT). A model based on SO(5)/SO(4) is here analyzed. In a specific non minimal version, vector-like quarks of mass as low as 300-500 GeV are allowed in a thin region of its parameter space. Other models fail to be consistent with the EWPT.17 pages with 8 figures Small modifications according to JHEP requirementsHigh Energy Physics - Phenomenologytext