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We have analysed the data collected by OPAL at centre-of-mass energiesbetween 189 and 209 GeV searching for Higgs boson candidates from the processe+e- -> h0Z0 followed by the decay of h0 -> A0A0 where A0 is the CP-odd Higgsboson. The search is done in the region where the A0 mass, mA, is below theproduction threshold for bbbar, and the CP-even Higgs boson mass mh is withinthe range 45-86 GeV/c^2. In this kinematic range, the decay of h0 -> A0A0 maybe dominant and previous Higgs boson searches have very small sensitivities.This search can be interpreted within any model that predicts the existence ofat least one scalar and one pseudoscalar Higgs boson. No excess of events isobserved above the expected Standard Model backgrounds. Model-independentlimits on the cross-section for the process e+e- -> h0Z0 are derived assuming100% decays of the h0 into A0A0 and 100% decays of the A0A0 into each of thefollowing final states: ccbarccbar, gggg, tau+tau-tau+tau-, ccbargg ggtau+tau-and ccbartau+tau-. The results are also interpreted in the CP-conservingno-mixing MSSM scenario, where the region 45 <= mh <= 85 GeV/c^2 and 2<= mA <=9.5 GeV/c^2 is excluded.

Search for a low mass CP-odd Higgs boson in $\mathrm{e^+e^-}$ collisions with the OPAL detector at LEP2