Little Higgs models with a light T quark Original Research Article

We study little Higgs models based on a image global symmetry and with two scales (the two vacuum expectation values image) substantially different. We show that all the extra vector boson fields present in these models may be much heavier than the vectorlike T quark necessary to cancel top-quark quadratic corrections. In this case the models become an extension of the Standard Model with a light image T quark and a scalar Higgs field with a large singlet component. We obtain that the Yukawa and the gauge couplings of the Higgs are smaller than in the standard model, a fact that may reduce significantly the Higgs production rate through glu–glu and WW fusion. The T quark decay into Higgs boson becomes then the dominant Higgs production channel in hadron colliders.