CP-odd Higgs boson production in association with Neutral gauge boson in High-Energy $e^{+}{e}^{-}$ Collisions

Abstract

We study the associated production of a CP-odd Higgs boson $A^0$ with a neutral gauge boson ($Z$ or photon) in high-energy $e^{+}{e}^{-}$ collisions at the one-loop level in the framework of Two Higgs Doublet Models (THDM). We find that in the small $\tan \beta$ regime the top quark loop contribution is enhanced leading to significant cross-sections (about a few fb), while in the large $\tan \beta$ regime the cross-section does not attain observable rates.

16 pages Latex, 4 figures, figures in agreement with erratum

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