Abstract
In LEP searches for the neutral CP-odd scalar A 0 of a multi-Higgs double model, experiments have searched for Z→ h 0 A 0 (where h 0 is the lightest CP-even scalar). No model-independent limit on the A 0 mass can be deduced from present data if m h 0 > m Z .In this paper, we compute the rates for Z→A 0A 0v v and ( e + e −→ A 0 A 0 Z. Assuming that no light CP-even neutral scalars exist, the branching ratio for Z→A 0A 0v v is found to be less than 1.4×10 −8 At higher e +e − center-of-mass energies, σ( e + e −→ A 0 A 0 Z) peaks at 0.5 fb. A comparison with other direct searches for the A 0 is briefly considered.
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