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In the $s$-channel Higgs-boson-exchange processes, the interference betweenthe amplitudes for CP-even and CP-odd Higgs bosons is sizable, if thehelicities of initial and final particles are properly fixed and if the massdifference between these bosons is not much larger than their decay widths. Wediscuss this interference effect in the process $\mu^+ \mu^-$ $\to t\bar{t}$.Examining the effects gives us information on CP-parity for Higgs bosons and onthe sign of a product of the coupling constants for $H\mu^-\mu^+$, $Ht\bar{t}$,$A\mu^-\mu^+$ and $At\bar{t}$ vertices. The feasibility of observing theinterference effect in future muon colliders is evaluated in the framework ofthe minimal supersymmetric extension of the standard model as an example.Comment: 18 pages, LATEX file with 3 PS figures, some comments and references  adde

Production of CP-even and CP-odd Higgs bosons at muon colliders