DescriptionThis thesis presents the design and results of a search for physics beyond the standard model in events containing jets with substructure resulting from new particles decaying into a photon and two gluons. Jet substructure techniques are adapted to develop a new approach for photon identification in a dense hadronic environment. The analyzed proton-proton collision data were collected by the CMS experiment at center-of-mass energy of 13 TeV in 2016 and correspond to an integrated luminosity of 35.9 inverse femtobarns. No statistically significant excess is observed in data. The first cross section limits on new physics processes resulting in such events are set and interpreted in the context of a Stealth Supersymmetry model.