A new particle with proprieties similar to those of the Higgs boson in the
Standard Model (SM) has been recently discovered. The biggest discrepancy is
related to its diphoton decay, whose branching ratio seems to be around two
times larger with respect to the correspondent SM value; this evidence, even if
still affected by large uncertainties, suggests that clues of new physics
related to the spontaneous breaking of the electroweak symmetry could be hidden
under this loop-induced process. A new strongly-coupled sector responsible for
this breaking, for instance, could produce in analogy with QCD a charged
massive spin-2 state. In light of these arguments we calculate and discuss the
role of such a resonance in the diphoton decay width of the Higgs.Comment: 12 pages + appendices, 5 figures. v2: minor changes, references adde
