A search was performed for the associated production of two different Higgs bosons via a virtual Z0 in e+e- annihilation (e+e- → h10h20) using the JADE detector at PETRA. This was motivated by the interpretation of the monojet events observed at the CERN pp collider as anomalous Z0 decays into two neutral Higgs bosons (h10 and h20), where h10 is stable and escapes detection while h20 decays into hadrons. Single- or di-jet events with large momentum imbalance are then expected at PETRA energies. No evidence for such events was found in our data; this excludes h20 masses in the range of 1 to 21 GeV with 95% CL, if the branching fraction for Z0 → h10h20 is a larger than one half that for Z0 → vμvμ. The possibility that the monojets could originate from supersymmetric higgsino production from Z0 decay is also examined.
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