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A search for doubly charged Higgs production in Z<sup>0</sup> decays
OPAL Collaboration,Acton, P.D.,Alexander, G.,Allison, J.,Allport, P.P.,Anderson, K.J.,Arcelli, S.,Astbury, A.,Axen, D.,Azuelos, G.,Bahan, G.A.,Baines, J.T.M.,Ball, A.H.,Banks, J.,Barlow, R.J.,Barnett, North-Holland Pub. Co 1992 Physics letters. Section B Vol.295 No.3
A search for the decay of the Z<SUP>0</SUP> into doubly charged Higgs bosons (H<SUP>+/-+/-</SUP>) 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<SUP>-</SUP>. Four-track final states from prompt decays, and events with at least one highly ionizing track from long-lived H<SUP>+/-+/-</SUP> were sought. H<SUP>+/-+/-</SUP> are excluded in the mass range from zero to 45.6 GeV/c<SUP>2</SUP> and for a coupling constant range that extends down to zero.