%0 Journal Article %T Heavy Higgs Productions at $¦Ã¦Ã$ Colliders %A Eri Asakawa %J Physics %D 1999 %I arXiv %X Multi-Higgs doublet models include more than one neutral Higgs bosons, some of which have different properties under a CP transformation. We examine their productions at $\gamma \gamma$ colliders. It is found that helicity observations of final top-pairs can be powerful tools to distinguish their CP properties, especially when masses of the Higgs bosons are almost degenerate. %U http://arxiv.org/abs/hep-ph/9908457v2