CP-odd A0 production at e+e- colliders in the minimal supersymmetric standard model with CP violating phases

We study the production of a heavy CP-odd A0 boson in association with a photon e+e-→A0γ and a Z boson e+e-→A0Z as well as the single production of A0 via e+e-→νeν-bareA0 in the minimal supersymmetric standard model (MSSM) with CP violating phases. In the case of e+e-→A0γ/A0Z, we show that the squark contribution, which vanishes in the MSSM with real parameters, turns out to be sizable in the presence of CP violating phases in the soft supersymmetric parameters. For e+e-→νeν-bareA0 in both the two Higgs doublet model and the MSSM with real parameters, the cross section does not reach observable rates at a Next Linear Collider. It is found that, with a large CP violating phase for At, cross sections of the order of 0.08 fb are attainable for all the processes e+e-→A0γ, e+e-→A0Z, and e+e-→νeν-bareA0