Radiative corrections to heavy-Higgs-scalar production and decay

A simple formalism, based on the Goldstone-boson equivalence theorem, is described for calculating O($g^2$ $m_H^2$/$m_W^2$) radiative corrections in the standard model. We apply this method to heavy-Higgs-boson decays and find that the dominant decay rates Γ(H→$W^{+}$ $W^{\mathrm{-}}$) and Γ(H→ZZ) are enhanced by a factor 1+(${\mathit{g}}^2$/8${\mathrm{\pi }}^2$)(${\mathit{m}}_{\mathit{H}}^2$/${\mathit{m}}_{\mathit{W}}^2$) (19/16-3)/8√3 π+(5/48${\mathrm{\pi }}^2$). The same enhancement applies to heavy-Higgs-boson production from $W^{+}$ $W^{\mathrm{-}}$ and ZZ fusion. Corrections of O($g^2$ln$m_H$) are also briefly discussed.