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The recent observation of a modest excess in diphoton final states at theLHC, by both the ATLAS and CMS Collaborations, has sparked off the expectedrace among theorists to find the right explanation for this proto-resonance,assuming that the signal will survive and not prove to be yet anotherstatistical fluctuation. We carry out a general analysis of this `signal' inthe case of a scalar which couples only to pairs of gluons (for production) andphotons (for diphoton decay modes), and establish that an explanation of theobserved resonance, taken together with the null results of new physicssearches in all the other channels, requires a scalar with rather exoticbehaviour. We then demonstrate that a fairly simple-minded extension of theminimal Randall-Sundrum model can yield a radion candidate which mightreproduce this exotic behaviour.

Radion Candidate for the LHC Diphoton Resonance