Higher Order Corrections to the Hadronic Higgs Decay

A Higgs boson in the intermediate mass range is considered. An effective Lagrangian approach is used in order to evaluate the top-induced QCD corrections of order $\alpha_s^3$ to the decay into light quarks and $O(\alpha_s^4)$ corrections to the gluonic decay mode. The connection to the decoupling relations for $\alpha_s$ and the light quark masses is discussed.