Abstract
Based on the two Higgs doublet model, we study the effect of Higgs–boson exchange on the heavy quarkonium which induces a strong attractive force between a heavy quark Q and an antiquark . An interesting application is the decay of heavy quarkonia to a Higgs boson associated with gauge bosons. The criterion for making the bound state is studied. We also show that nonperturbative effects due to gluonic field fluctuations are rather small in such a heavy quark sector. Possible enhancement for production and decays of bound states coming from the fourth generation quark Q is discussed for (at the Tevatron) and pp (at the LHC) collisions.
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