A search for doubly charged Higgs production in Z0 decays

A search for the decay of the Z0 into doubly charged Higgs bosons (H±±) decaying to same-sign lepton pairs is presented using data collected with the OPAL detector at LEP, with an integrated luminosity of 6.8 pb−. Four-track final states from prompt decays, and events with at least one highly ionizing track from long-lived H±± were sought. H±± are excluded in the mass range from zero to 45.6 GeV/c2 and for a coupling constant range that extends down to zero.