Abstract

If the standard electroweak gauge model is extended to include two or more Higgs doublets, there may be a neutral Higgs boson hh which is light (with a mass of say 10 GeV) but the hZZhZZ coupling is suppressed so that it has so far escaped experimental detection. However, the effective hhZZhhZZ coupling is generally unsuppressed, hence the decay of Z into two light Higgs bosons plus a fermion-antifermion pair may have an observable branching fraction, especially if hh decays invisibly as for example in the recently proposed doublet Majoron model.

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