Charged and Pseudoscalar Higgs production at a Muon Collider

We consider single charged Higgs ($H^{\pm }$) and pseudoscalar Higgs ($A^0$) production in association with a gauge boson at ${\mu }^{+}{\mu }^{-}$ colliders. We find that the tree-level t-channel and s-channel contributions to $\mu^+\mu^-\to H^{\pm}W^{\mp}, A^0Z$areenhancedforlargevaluesof$\tan\beta$, allowing sizeable cross-sections whose analogies at $e^{+}{e}^{-}$ colliders would be very small. These processes provide attractive new ways of producing such particles at ${\mu }^{+}{\mu }^{-}$ colliders and are superior to the conventional methods in regions of parameter space.