Z0Z0andW+W−pair production at supercollider energies

We present the invariant-mass distributions for the production of $Z^0$ $Z^0$ pairs by $W^{+}$ $W^{\mathrm{-}}$ and $Z^0$ $Z^0$ fusion at 40 TeV. Results are given for Higgs-boson masses of 0.5 and 1.0 TeV and a rapidity cut ${\eta }_c$ of 1.5. These calculations, which are performed using the effective-gauge-boson approximation, are compared with the corresponding results for the production of $W^{+}$ $W^{\mathrm{-}}$ pairs by the same fusion mechanism. A comparison between the approximate calculation and an exact calculation of $Z^0$ $Z^0$ pair production by $W^{+}$ $W^{\mathrm{-}}$ fusion is also presented.