An electroweak singlet scalar can couple to pairs of vector bosons through loop-induced dimension five operators. Compared to a standard model Higgs boson, the singlet decay widths in the diphotons and Zγ channels are generically enhanced, while decays into massive final states like $WW$ and $ZZ$ are kinematically disfavored. The overall event rates into γγ and Zγ can exceed the standard model expectations by orders of magnitude. Such a singlet may appear as a resonant signal in the γγ and Zγ channels, even with a mass above the $WW$ kinematic threshold.
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Low et al. (2011) studied this question.
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