We consider the possible decay modes of a heavy Higgs boson in the mass range $M_W\left(\sim 80 \mathrm{Gev}\right)\le M_H\le 1$ TeV within the standard model of Weinberg and Salam. For $M_H>2\mathrm{}{M}_{W, Z}$ we find the decay modes $H\to W^{+}{W}^{-} or Z^0{Z}^0$ to dominate the usual fermion-antifermion decay $\mathrm{}\left(\mathrm{ff}\right)\mathrm{}$; for $M_{W,Z}\le M_H\le 2M_{W, Z}$ we find the Higgs-boson width still dominated by $\overline{f}f$ although new decays such as $H\to W^{\pm }+\overline{f}{f}^{\prime }$ and $H\to Z^0+\overline{f}f$ are present. These new decay modes are significantly phase-space suppressed and are found to contribute with branching ratios less than 1%.

• Received 26 March 1980

DOI:https://doi.org/10.1103/PhysRevD.22.722