  We study the recently reported excess in the diphoton resonance search by
ATLAS and CMS. We investigate the available parameter space in the combined
run-1 and run-2 diphoton data and study its interpretation in terms of a
singlet scalar field which possibly mixes with the Standard Model Higgs boson.
We show that the mixing angle is already strongly constrained by high-mass
Higgs searches in the diboson channel, and by Higgs coupling measurements.
While a broad resonance is slightly favored, we argue that the signal is
consistent with a narrow-width singlet which couples to colored and
electromagnetically-charged vector-like fermions. Dijet signals are predicted
and may be visible in upcoming analyses. Allowing for additional decay modes
could explain a broader resonance, however, we show that monojet searches
disfavor a large invisible width. Finally, we comment on the possible relation
of this scenario to the naturalness problem.

High Energy Physics - Phenomenology