Motivated by the diphoton resonance recently reported by the ATLAS and CMS collaborations at √s=13 TeV, we interpret the resonance as a scalar boson $X(750)$ in hidden-valley-like models. The scalar boson X can mix with the standard model Higgs boson and thus can be produced via gluon fusion. It then decays into a pair of very light hidden particles Y of O(1 GeV), each of which in turn decays to a pair of collimated π⁰'s, and these two π⁰'s decay into photons which then form photon jets. A photon jet (γ jet) is a special feature that consists of a cluster of collinear photons from the decay of a fast moving light particle [O(1 GeV)]. Because these photons inside the photon jet are so collimated that it cannot be distinguished from a single photon, in the final state of the decay of $X(750)$ a pair of photon jets looks like a pair of single photons, which the experimentalists observed and reconstructed the 750 GeV diphoton resonance. Prospects for LHC Run-2 about other new and testable features are also discussed.
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Chang et al. (2016) studied this question.
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