摘要
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.