Unitarity Effects inW+W−Elastic Scattering

Unitarity effects associated with the two-channel system consisting of the states $W_L^{+}{W}_L^{-}$ and $\frac{Z_L^0{Z}_L^0}{\sqrt{2}}$ are investigated using the $K$-matrix technique. In $W_L^{+}{W}_L^{-}$ elastic scattering, we find that for a Higgs-boson mass ($m_H$) of 0.5 TeV the unitarized $s$-wave amplitude is very similar to the Born amplitude modified by the addition of a Higgs-boson width. When $m_H$ reaches 1.4 TeV, which is above the unitarity bound obtained from the Born term, the unitarized amplitude saturates at an absolute value of about $\frac{2}{3}$ of the unitarity limit. The implications of unitarity on $W$-pair production at Superconducting Super Collider energies are also discussed.