Abstract
We investigate the production of CP-odd Higgs boson A^0A0 associated with a real \gammaγ in e^+e^-e+e− collisions. Because of the properties of A^0A0 coupling to the other fields, the main contribution comes from the top-quark triangle loop diagrams. We obtain the “timelike” transition form factor which describes the production amplitude of A^0A0 in the e^+e^-e+e− collisions. This timelike transition form factor is related to the spacelike transition form factor relevant for the A^0A0 production in e^-\gammae−γ collisions. It turns out that the possible extra contributions from chargino-sneutrino and neutralino-selectron box diagrams do not give sizable effects.
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