Single charged Higgs production as a probe of CP violation at a muon collider

We consider single charged Higgs (H±) production in association with a W± boson at μ+μ− colliders, in the context of the general CP violating Two Higgs Doublet Model (2HDM). We find that large cross-sections for the processes μ+μ−→H+W−, H−W+ are possible, and offer an attractive way of producing H± at μ+μ− colliders. The difference in the cross-sections for H+W− and H−W+ may exceed 1000 fb, and this represents a novel way of probing CP violation in the Higgs sector.