Abstract
A detailed discussion is presented of rates and backgrounds for studying Higgs boson production and W LW L, Z LZ L, W LZ L scattering at very high energy e +e − colliders. The e ̄ e → e ̄ eWW , γγWW backgrounds limit the reach for discovering Higgs bosons. Strong interaction effects, which must develop for invariant masses above 1 TeV if there is no Higgs boson or if M H is very large, would best be seen in final states involving two Z's which decay to charged leptons, for which backgrounds are small. Quantitative studies of strong interaction effects should be possible for √s ⪆ 5 TeV .
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