Search for new physics in events with closely collimated photons and gluons

This letter reports the results of a search for physics beyond the standard model. The search is performed with 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 proton-proton collision data analyzed were collected by the CMS experiment at $\sqrt{s}=13~\mathrm{TeV}$ during 2016 and correspond to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. No statistically significant excess is observed and the first cross section limits on processes yielding such events are set.