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If the Standard Model particle content is extended by gauge singlet fermions(right-handed neutrinos), active neutrinos generically acquire (Majorana)masses, in agreement with our current understanding of the lepton sector. Ifthe right-handed neutrino masses are of the same order as the electroweaksymmetry breaking scale, it is usually expected that these will not mediate anyexperimentally observable effects. Here, I explore the fact that this is notnecessarily the case. If neutrino masses are "accidentally small",active-sterile mixing angles can, according to current experimental bounds, beas large as several percent. If this is the case, I argue that the dominantdecay mode of light (M_H less than 130 GeV) Higgs bosons could be into anactive and a sterile neutrino. The sterile neutrino decays promptly into acharge lepton and an on- or off-shell W-boson, so that the dominant Higgs bosondecay mode is H to leptons + jets + missing transverse energy.

GeV Seesaw, Accidentally Small Neutrino Masses, and Higgs Decays to Neutrinos