Higgs Production: CP Studies in e-e- Collisions

We review the production of scalar Higgs-like particles in high-energy electronelectron collisions, via the fusion of electroweak gauge bosons. The emphasis is on how to distinguish a CP -even from a CP -odd Higgs particle. Among the more signicant dierences, we nd that in the CP -odd case, the Higgs spectrum is much harder, and the dependence of the total cross section on the product of the polarizations of the two beams is much stronger, than in the CP -even case. We also briey discuss parity violation, and the production of charged Higgs bosons. 1 Introduction In the planning for a future linear collider [1, 2] one has to explore not only the electronpositron mode and various photon modes, but also an electron-electron mode, in spite of concerns related to beam \disruption". One reason for an electron-electron collider to be interesting is that one may produce states not accessible in the annihilation channel, another is that a large electron polarization will be readily avai..