Abstract
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 $Z\ensuremath{\gamma}$ channels are generically enhanced, while decays into massive final states like $WW$ and $ZZ$ are kinematically disfavored. The overall event rates into $\ensuremath{\gamma}\ensuremath{\gamma}$ and $Z\ensuremath{\gamma}$ can exceed the standard model expectations by orders of magnitude. Such a singlet may appear as a resonant signal in the $\ensuremath{\gamma}\ensuremath{\gamma}$ and $Z\ensuremath{\gamma}$ channels, even with a mass above the $WW$ kinematic threshold.
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