Higgs-boson production from heavy-quark fusion

We study the production of Higgs bosons from heavy-quark fusion at future hadron colliders. We use a heavy-quark distribution function to combine the processes QQ¯→H and gQ→HQ with the process gg→QQ¯H to obtain a cross section in which potentially large logarithms, of order ln($m_H$/$m_Q$), are summed to all orders in the strong coupling. We show that Higgs bosons which have an enhanced coupling to bottom quarks may be predominantly produced via bottom-quark fusion. We concentrate on the supersymmetric two-Higgs-doublet model, in which this enhancement occurs naturally.