Abstract
In a class of extended Higgs structures containing a light or massless pseudoscalar it is quite likely the normal Wienberg-Salam Higgs particle decays preferentially into spin-zero bosons if its mass is below the t t threshold. These spin-zero bosons may be invisible either because they do not decay or because they decay into neutrinos. Thus Higgs particles may be light enough to be produced at accessible energies but difficult to detect through their decay products.
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