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Run 2 LHC data show hints of a new resonance in the diphoton distribution atan invariant mass of 750 GeV. We analyse the data in terms of a new boson,extracting information on its properties and exploring theoreticalinterpretations. Scenarios covered include a narrow resonance and, aspreliminary indications suggest, a wider resonance. If the width indicationspersist, the new particle is likely to belong to a strongly-interacting sector.We also show how compatibility between Run 1 and Run 2 data is improved bypostulating the existence of an additional heavy particle, whose decays arepossibly related to dark matter.

What is the gamma gamma resonance at 750 GeV?